Preparation method and system of needle type lithium battery electrode material based on graphene doping

Abstract

The invention relates to the field of battery material preparation, in particular to a graphene-doping-based needle type lithium battery electrode material preparation method and system.The method comprises the steps that a conductive agent raw material set and an auxiliary raw material set are obtained, an electrode preparation mechanism is confirmed, the conductive agent raw material set is subjected to segmented ball milling treatment, and mixed conductive raw materials are obtained; carrying out ultrasonic mixing treatment on the mixed conductive raw material and the auxiliary raw material set to obtain composite electrode slurry, carrying out electrostatic spinning on the composite electrode slurry to obtain a composite fiber membrane set, carrying out high-temperature sintering operation on the composite fiber membrane to obtain a composite carbonized material, and carrying out calendering treatment on the composite carbonized material by utilizing a preset initial pressure and a calender to obtain the composite conductive material. And performing pore conductivity analysis on a standard electrode sample to obtain a comprehensive conductivity index, and summarizing the target electrode materials to complete the preparation of the needle type lithium battery electrode material. The automation degree of the electrode material preparation process can be improved, and the conductivity and the product quality of the electrode material are improved.

Description

Technical Field

[0001] The present invention relates to the field of battery material preparation, and particularly to a preparation method, system, electronic device and computer-readable storage medium for a needle-type lithium battery electrode material based on graphene doping. Background Art

[0002] With the rapid development of new energy technologies, lithium-ion batteries are widely used in electric vehicles and portable electronic devices due to their advantages such as high energy density and long cycle life. As the core component of lithium-ion batteries, the conductivity, structural stability and preparation process of electrode materials directly affect the overall performance of the batteries.

[0003] Currently, traditional lithium battery electrode materials mostly adopt a single conductive agent (such as conductive carbon black or graphite) to be compounded with active materials. Graphene has excellent electrical, mechanical and other properties, and doping it into lithium battery electrode materials is expected to improve the performance of the electrode materials.

[0004] Although doping graphene into electrode materials can improve the performance of the electrode materials, there are still some bottlenecks in the doping process of graphene into electrode materials, such as uneven mixing of raw materials and difficult control of process parameters. Therefore, there is an urgent need to develop a preparation method for needle-type lithium battery electrode materials with high automation and precise controllability to solve the problems existing in the existing doping processes. Summary of the Invention

[0005] The present invention provides a preparation method and a computer-readable storage medium for a needle-type lithium battery electrode material based on graphene doping, and its main purpose is to improve the automation degree in the preparation process of the electrode material, and improve the conductivity and product quality of the electrode material.

[0006] To achieve the above object, a preparation method for a needle-type lithium battery electrode material based on graphene doping provided by the present invention includes:

[0007] Obtaining a conductive agent raw material set and an auxiliary raw material set, wherein the conductive agent raw material set includes: graphene raw material, artificial graphite raw material and conductive carbon black raw material, and the auxiliary raw material set includes: active material and binder;

[0008] Confirming an electrode preparation mechanism, wherein the electrode preparation mechanism includes: a ball mill, an ultrasonic disperser, an electrospinning machine, a tube furnace and a calender, wherein the ball mill includes: a ball milling tank, grinding balls, a vacuum pump and a gas pressure sensor, and the ultrasonic disperser includes: a vacuum degassing machine, a densitometer, a thermometer, a viscometer, a turbidimeter and an ultrasonic homogenizer;

[0009] The conductive agent raw material set is subjected to segmented ball milling treatment by a ball mill to obtain a mixed conductive raw material. The mixed conductive raw material and the auxiliary raw material set are subjected to ultrasonic mixing treatment by an ultrasonic disperser to obtain a composite electrode slurry. The composite electrode slurry is subjected to electrospinning by an electrospinning machine to obtain a composite fiber membrane set;

[0010] The composite fiber membrane is extracted from the composite fiber membrane set. The composite fiber membrane set from which the composite fiber membrane is extracted is used as an updated fiber membrane set, and the following operations are performed on the extracted composite fiber membrane:

[0011] The composite fiber membrane is subjected to high-temperature sintering operation by a tubular furnace and a preset initial temperature to obtain a composite carbonized material. The composite carbonized material is subjected to rolling treatment by a preset initial pressure and a rolling mill to obtain a standard electrode material;

[0012] A standard electrode sample is extracted from the standard electrode material, pore conductivity analysis is performed on the standard electrode sample to obtain a comprehensive conductivity index, and the comprehensive conductivity index is compared with a preset conductivity threshold;

[0013] If the comprehensive conductivity index is greater than or equal to the conductivity threshold, the standard electrode material after extracting the standard electrode sample is used as the target electrode material, the updated fiber membrane set is used as the composite fiber membrane set, and the step of extracting the composite fiber membrane from the composite fiber membrane set is returned until there is no composite fiber membrane in the composite fiber membrane set;

[0014] If the comprehensive conductivity index is less than the conductivity threshold, the updated temperature and the updated pressure are calculated using the initial temperature and the initial pressure. The updated temperature is used as the initial temperature, the updated pressure is used as the initial pressure, the updated fiber membrane set is used as the composite fiber membrane set, and the step of extracting the composite fiber membrane from the composite fiber membrane set is returned until there is no composite fiber membrane in the composite fiber membrane set;

[0015] The target electrode materials are summarized to obtain a target electrode material set, and the preparation of the needle-type lithium battery electrode material is completed.

[0016] Optionally, the step of subjecting the conductive agent raw material set to segmented ball milling treatment by a ball mill to obtain a mixed conductive raw material includes:

[0017] Primary graphene, primary artificial graphite, and primary conductive carbon black are obtained based on the ball mill and the conductive agent raw material set;

[0018] The primary graphene is placed into the ball mill pot to obtain a primary ball mill pot. The vacuum pump is started, and the primary ball mill pot after starting is subjected to a vacuuming operation by the started vacuum pump. The updated pot internal pressure of the primary ball mill pot during the vacuuming operation is monitored in real time by a pressure sensor until the updated pot internal pressure is less than or equal to a preset first pressure threshold, and then the vacuum pump is turned off to obtain an updated ball mill pot;

[0019] Use a pre-built high-purity argon gas cylinder to fill the updated ball milling tank with argon gas, and use a pressure sensor to monitor the target tank internal pressure of the updated ball milling tank being filled with argon gas in real time until the target tank internal pressure is greater than or equal to a preset second pressure threshold to obtain a target primary ball milling tank;

[0020] Use a ball mill to perform a ball milling operation on the primary graphene in the target primary ball milling tank to obtain a primary ball milling raw material, where the rotation speed and time for the ball mill to perform the ball milling operation on the primary graphene in the target primary ball milling tank are a preset first ball milling rotation speed and a preset first ball milling time respectively;

[0021] Place the primary artificial graphite and the primary ball milling raw material into the ball milling tank of the ball mill to obtain an intermediate ball milling tank, and obtain a target intermediate ball milling tank based on a vacuum pump, a pressure sensor, a high-purity argon gas cylinder, and the intermediate ball milling tank;

[0022] Use a ball mill to perform a ball milling operation on the primary artificial graphite and the primary ball milling raw material in the target intermediate ball milling tank to obtain an intermediate ball milling raw material, where the rotation speed and time for the ball mill to perform the ball milling operation on the primary artificial graphite and the primary ball milling raw material in the target intermediate ball milling tank are a second ball milling rotation speed and a second ball milling time respectively, and the second ball milling rotation speed is twice the first ball milling rotation speed, and the second ball milling time is one-half of the first ball milling time;

[0023] Place the primary conductive carbon black and the intermediate ball milling raw material into the ball milling tank of the ball mill to obtain a high-level ball milling tank, and obtain a target high-level ball milling tank based on a vacuum pump, a pressure sensor, a high-purity argon gas cylinder, and the high-level ball milling tank;

[0024] Use a ball mill to perform a ball milling operation on the primary conductive carbon black and the intermediate ball milling raw material in the target high-level ball milling tank to obtain a mixed conductive raw material, where the rotation speed and time for the ball mill to perform the ball milling operation on the primary conductive carbon black and the intermediate ball milling raw material in the target high-level ball milling tank are a third ball milling rotation speed and a third ball milling time respectively, and the third ball milling rotation speed is twice the second ball milling rotation speed, and the third ball milling time is one-half of the second ball milling time.

[0025] Optionally, the obtaining of the primary graphene, the primary artificial graphite, and the primary conductive carbon black based on the ball mill and the conductive agent raw material set includes:

[0026] Confirm the grinding ball mass of the grinding balls in the ball mill, and calculate the graphene mass according to the grinding ball mass. The calculation formula is as follows:

[0027]

[0028] where, m Gs is the graphene mass, m X is the grinding ball mass, and k x is a preset ball-to-material ratio;

[0029] Calculate the mass of artificial graphite according to the mass of graphene and the preset first raw material ratio. The calculation formula is as follows:

[0030]

[0031] Among them, m Gra is the mass of artificial graphite, and k 1 is the first raw material ratio;

[0032] Obtain the mass of conductive carbon black based on the mass of graphene and the preset second raw material ratio;

[0033] Extract primary graphene from the graphene raw materials in the conductive agent raw material set based on the mass of graphene, extract primary artificial graphite from the artificial graphite raw materials in the conductive agent raw material set based on the mass of artificial graphite, and extract primary conductive carbon black from the conductive carbon black raw materials in the conductive agent raw material set based on the mass of conductive carbon black. Among them, the masses of primary graphene, primary artificial graphite, and primary conductive carbon black are the mass of graphene, the mass of artificial graphite, and the mass of conductive carbon black, respectively.

[0034] Optionally, the ultrasonic dispersion instrument is used to perform ultrasonic mixing treatment on the mixed conductive raw materials and the auxiliary raw material set to obtain a composite electrode slurry, including:

[0035] Perform a weighing operation on the mixed conductive raw materials to obtain the mass of the mixed raw materials;

[0036] Obtain the mass of the active material based on the mass of the mixed raw materials and the preset third raw material ratio, and obtain the mass of the binder based on the mass of the mixed raw materials and the preset fourth raw material ratio;

[0037] Extract primary active material from the active materials in the auxiliary raw material set based on the mass of the active material, and extract primary binder from the binders in the auxiliary raw material set based on the mass of the binder. Among them, the masses of the primary active material and the primary binder are the mass of the active material and the mass of the binder, respectively;

[0038] Perform a liquid mixing operation on the mixed conductive raw materials, the primary active material, and the primary binder to obtain a raw slurry, and place the raw slurry into an ultrasonic homogenizer to obtain a primary slurry;

[0039] Input the preset initial ultrasonic frequency and the preset initial power into the ultrasonic homogenizer to obtain a target homogenizer;

[0040] Start the target homogenizer, record the time in real time starting from the time when the target homogenizer is started to obtain the ultrasonic time, and use the target homogenizer to perform a homogenization mixing operation on the primary slurry. When the ultrasonic time reaches the preset homogenization time threshold, turn off the target homogenizer to obtain a primary electrode slurry;

[0041] Extract a primary slurry sample from the primary electrode slurry, and perform detection operations on the primary slurry sample using a densitometer, a thermometer, a viscometer, and a turbidimeter respectively to obtain the slurry density, the slurry temperature, the slurry dynamic viscosity, and the slurry turbidity;

[0042] Calculate the slurry uniformity index based on the slurry density, the slurry temperature, the slurry dynamic viscosity, and the slurry turbidity, and compare the slurry uniformity index with a preset slurry uniformity threshold;

[0043] If the slurry uniformity index is greater than or equal to the preset slurry uniformity threshold, perform a vacuum degassing operation on the primary electrode slurry using a vacuum degassing machine to obtain a composite electrode slurry;

[0044] If the slurry uniformity index is less than the slurry uniformity threshold, calculate the corrected ultrasonic frequency and the corrected power based on the slurry density, the slurry temperature, the slurry dynamic viscosity, the slurry turbidity, the initial ultrasonic frequency, and the initial power. Take the corrected ultrasonic frequency as the initial ultrasonic frequency, take the corrected power as the initial power, take the primary electrode slurry as the primary slurry, and return to the step of inputting the preset initial ultrasonic frequency and the preset initial power into the ultrasonic homogenizer until the slurry uniformity index is greater than or equal to the slurry uniformity threshold.

[0045] Optionally, the calculation formula of the slurry uniformity index is as follows:

[0046]

[0047] where, φ H is the slurry uniformity index, T H is the slurry temperature, T 0 is the preset initial temperature, σ TU is the slurry turbidity, μ dv is the slurry dynamic viscosity, ρ H is the slurry density, tanh is the hyperbolic tangent function, and e is the natural constant.

[0048] Optionally, the calculating the corrected ultrasonic frequency and the corrected power based on the slurry density, the slurry temperature, the slurry dynamic viscosity, the slurry turbidity, the initial ultrasonic frequency, and the initial power includes:

[0049] Calculate the corrected ultrasonic frequency based on the slurry turbidity, the slurry dynamic viscosity, the slurry density, and the initial ultrasonic frequency. The calculation formula is as follows:

[0050]

[0051] where, v sou is the corrected ultrasonic frequency, v 0 is the initial ultrasonic frequency;

[0052] Calculate the corrected power based on the slurry temperature and the initial power. The calculation formula is as follows:

[0053]

[0054] Where p sou is the corrected power, p 0 is the initial power, and T c is the preset reference temperature.

[0055] Optionally, the high-temperature sintering operation is performed on the composite fiber membrane using a tube furnace and a preset initial temperature to obtain a composite carbonized material, including:

[0056] Confirm the relay temperature based on the initial temperature, where the relay temperature is half of the initial temperature;

[0057] Place the composite fiber membrane into the tube furnace to obtain an initial tube furnace, and perform an argon filling operation on the initial tube furnace using a high-purity argon gas cylinder to obtain a target tube furnace;

[0058] Start the target tube furnace, and use the started target tube furnace to burn the composite fiber membrane. The temperature at which the target tube furnace burns the composite fiber membrane is the relay temperature. Starting from the time when the target tube furnace is started and recording the time in real time, obtain the first sintering time. Until the first sintering time reaches the preset first time threshold, turn off the target tube furnace to obtain the initial carbonized material;

[0059] Start the target tube furnace, and use the started target tube furnace to burn the initial carbonized material. The temperature at which the target tube furnace burns the initial carbonized material is the initial temperature. Starting from the time when the target tube furnace is started and recording the time in real time, obtain the second sintering time. Until the second sintering time reaches the preset second time threshold, turn off the target tube furnace to obtain the composite carbonized material, where the second time threshold is half of the first time threshold.

[0060] Optionally, performing pore conductance analysis on the standard electrode sample to obtain a comprehensive conductance index includes:

[0061] Perform a weighing operation on the standard electrode sample to obtain the standard sample mass;

[0062] Use a pre-built mercury intrusion porosimeter to perform a mercury intrusion test on the standard electrode sample to obtain the mercury liquid filling volume, where the test pressure for the mercury intrusion porosimeter to perform the mercury intrusion test on the standard electrode sample is preset;

[0063] Calculate the sample void index based on the mercury liquid filling volume, the standard sample mass, and the test pressure. The calculation formula is as follows:

[0064]

[0065] Among them, ε v is the sample void index, V Hg is the mercury filling volume, ρ Hg is the preset density of mercury, m b is the standard sample mass, P x is the test pressure, and ln is the natural logarithm;

[0066] Calculate the comprehensive conductivity index according to the sample void index, and the calculation formula is as follows:

[0067]

[0068] Among them, I xc is the comprehensive conductivity index, ε 0 is the preset reference pore index, m I , m 1 and m 2 are the mass of the mixed raw materials, the mass of the active material, and the mass of the binder respectively.

[0069] Optionally, the calculation of the updated temperature and the updated pressure using the initial temperature and the initial pressure includes:

[0070] Calculate the updated temperature according to the sample void index, the reference pore index, and the initial temperature, and the calculation formula is as follows:

[0071]

[0072] Among them, T y is the updated temperature, T x is the initial temperature;

[0073] Calculate the updated pressure based on the sample void index, the reference pore index, and the initial pressure.

[0074] To achieve the above object, the present invention also provides a preparation system for a needle-type lithium battery electrode material based on graphene doping, including:

[0075] A preparation material preparation module for obtaining a conductive agent raw material set and an auxiliary raw material set. Among them, the conductive agent raw material set includes: graphene raw material, artificial graphite raw material, and conductive carbon black raw material, and the auxiliary raw material set includes: active material and binder. Confirm the electrode preparation mechanism, where the electrode preparation mechanism includes: ball mill, ultrasonic disperser, electrospinning machine, tube furnace, and calender. Among them, the ball mill includes: ball mill tank, grinding balls, vacuum pump, and air pressure sensor, and the ultrasonic disperser includes: vacuum degassing machine, density meter, thermometer, viscometer, turbidimeter, and ultrasonic homogenizer;

[0076] A conductive raw material mixing module is used to perform segmented ball milling on a conductive agent raw material set by using a ball mill to obtain mixed conductive raw materials, perform ultrasonic mixing on the mixed conductive raw materials and an auxiliary raw material set by using an ultrasonic disperser to obtain a composite electrode paste, and perform electrospinning on the composite electrode paste by using an electrospinning machine to obtain a composite fiber membrane set;

[0077] A composite material processing module is used to extract a composite fiber membrane from the composite fiber membrane set, use the composite fiber membrane set from which the composite fiber membrane has been extracted as an updated fiber membrane set, and perform the following operations on the extracted composite fiber membrane: perform high-temperature sintering on the composite fiber membrane by using a tubular furnace and a preset initial temperature to obtain a composite carbonized material, and perform rolling treatment on the composite carbonized material by using a preset initial pressure and a rolling machine to obtain a standard electrode material;

[0078] A conductivity evaluation module is used to extract a standard electrode sample from the standard electrode material, perform pore conductivity analysis on the standard electrode sample to obtain a comprehensive conductivity index, compare the comprehensive conductivity index with a preset conductivity threshold. If the comprehensive conductivity index is greater than or equal to the conductivity threshold, use the standard electrode material after extracting the standard electrode sample as the target electrode material, use the updated fiber membrane set as the composite fiber membrane set, and return to the step of extracting the composite fiber membrane from the composite fiber membrane set until there is no composite fiber membrane in the composite fiber membrane set. If the comprehensive conductivity index is less than the conductivity threshold, calculate an updated temperature and an updated pressure by using the initial temperature and the initial pressure, use the updated temperature as the initial temperature, use the updated pressure as the initial pressure, use the updated fiber membrane set as the composite fiber membrane set, and return to the step of extracting the composite fiber membrane from the composite fiber membrane set until there is no composite fiber membrane in the composite fiber membrane set. Summarize the target electrode materials to obtain a target electrode material set, and complete the preparation of the needle-type lithium battery electrode material.

[0079] To solve the above problems, the present invention also provides an electronic device, and the electronic device includes:

[0080] A memory that stores at least one instruction; and

[0081] A processor that executes the instructions stored in the memory to implement the above-mentioned method for preparing a needle-type lithium battery electrode material based on graphene doping.

[0082] To solve the above problems, the present invention also provides a computer-readable storage medium, and at least one instruction is stored in the computer-readable storage medium, and the at least one instruction is executed by a processor in an electronic device to implement the above-mentioned method for preparing a needle-type lithium battery electrode material based on graphene doping.

[0083] To solve the problems described in the background art, the present invention obtains a conductive agent raw material set and an auxiliary raw material set. Among them, the conductive agent raw material set includes: graphene raw material, artificial graphite raw material, and conductive carbon black raw material, and the auxiliary raw material set includes: active material and binder. It can be seen that the embodiments of the present invention provide a raw material basis for the subsequent preparation of the composite electrode slurry by obtaining the conductive agent raw material set and the auxiliary raw material set, and then confirm the electrode preparation mechanism. Among them, the electrode preparation mechanism includes: ball mill, ultrasonic disperser, electrospinning machine, tube furnace, and calender. Among them, the ball mill includes: ball mill tank, grinding balls, vacuum pump, and air pressure sensor, and the ultrasonic disperser includes: vacuum degassing machine, densitometer, thermometer, viscometer, turbidimeter, and ultrasonic homogenizer. It can be seen that the embodiments of the present invention provide necessary equipment and a complete preparation environment for the preparation process of the electrode material by confirming the electrode preparation mechanism. The conductive agent raw material set is subjected to segmented ball milling treatment by the ball mill to obtain mixed conductive raw materials, and the ultrasonic disperser is used to perform ultrasonic mixing treatment on the mixed conductive raw materials and the auxiliary raw material set to obtain a composite electrode slurry. The electrospinning machine is used to electrospin the composite electrode slurry to obtain a composite fiber membrane set. It can be seen that the embodiments of the present invention sufficiently mix the conductive agent raw material set and the auxiliary raw material set through the ball mill and the ultrasonic disperser, and then use electrospinning to form a composite fiber membrane with higher conductivity from the composite electrode slurry, improving the conductivity and product quality of the electrode material. The composite fiber membrane is extracted from the composite fiber membrane set, and the composite fiber membrane set from which the composite fiber membrane is extracted is used as the updated fiber membrane set, and the following operations are performed on the extracted composite fiber membrane: the composite fiber membrane is subjected to high-temperature sintering operation by the tube furnace at a preset initial temperature to obtain a composite carbonized material, and the composite carbonized material is subjected to calendering treatment by the preset initial pressure and the calender to obtain a standard electrode material. It can be seen that the embodiments of the present invention further improve the structural stability and conductivity of the composite fiber membrane through the high-temperature sintering process of the tube furnace and the calendering treatment of the calender. The standard electrode sample is extracted from the standard electrode material, and pore conductivity analysis is performed on the standard electrode sample to obtain a comprehensive conductivity index. The comprehensive conductivity index is compared with a preset conductivity threshold. If the comprehensive conductivity index is greater than or equal to the conductivity threshold, the standard electrode material after extracting the standard electrode sample is used as the target electrode material, the updated fiber membrane set is used as the composite fiber membrane set, and the step of extracting the composite fiber membrane from the composite fiber membrane set is returned until there is no composite fiber membrane in the composite fiber membrane set. If the comprehensive conductivity index is less than the conductivity threshold, the updated temperature and updated pressure are calculated using the initial temperature and initial pressure, the updated temperature is used as the initial temperature, the updated pressure is used as the initial pressure, the updated fiber membrane set is used as the composite fiber membrane set, and the step of extracting the composite fiber membrane from the composite fiber membrane set is returned until there is no composite fiber membrane in the composite fiber membrane set. The target electrode materials are summarized to obtain a target electrode material set, and the preparation of the needle-type lithium battery electrode material is completed. It can be seen that the embodiments of the present invention screen qualified target electrode materials through the comprehensive conductivity index,Improve the automation degree of the electrode material preparation process, and at the same time use the comprehensive conductivity index to regulate the initial temperature and initial pressure, optimize the high-temperature sintering process of the tubular furnace and the process parameters of the rolling treatment of the rolling mill, and further improve the product quality of the electrode material. Therefore, the present invention can improve the automation degree of the electrode material preparation process, and improve the conductivity and product quality of the electrode material. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] Figure 1 It is a schematic flowchart of a method for preparing a needle-shaped lithium battery electrode material doped with graphene provided by an embodiment of the present invention;

[0085] Figure 2 It is a functional module diagram of a system for preparing a needle-shaped lithium battery electrode material doped with graphene provided by an embodiment of the present invention;

[0086] Figure 3 It is a schematic structural diagram of an electronic device for implementing the method for preparing a needle-shaped lithium battery electrode material doped with graphene provided by an embodiment of the present invention.

[0087] Description of the reference numerals:

[0088] 1. Electronic device; 10. Processor; 11. Memory; 12. Bus.

[0089] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0090] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0091] An embodiment of the present application provides a method for preparing a needle-shaped lithium battery electrode material doped with graphene. The execution subject of the method for preparing a needle-shaped lithium battery electrode material doped with graphene includes, but is not limited to, at least one of electronic devices such as a server, a terminal, etc. that can be configured to execute the method provided by the embodiment of the present application. In other words, the method for preparing a needle-shaped lithium battery electrode material doped with graphene can be executed by software or hardware installed on a terminal device or a server device, and the software can be a blockchain platform. The server includes, but is not limited to: a single server, a server cluster, a cloud server, or a cloud server cluster, etc.

[0092] Referring to Figure 1 As shown, it is a schematic flowchart of a method for preparing a needle-shaped lithium battery electrode material doped with graphene provided by an embodiment of the present invention. In this embodiment, the method for preparing a needle-shaped lithium battery electrode material doped with graphene includes:

[0093] S1. Obtain a conductive agent raw material set and an auxiliary raw material set. The conductive agent raw material set includes: graphene raw material, artificial graphite raw material, and conductive carbon black raw material. The auxiliary raw material set includes: active material and binder.

[0094] It should be explained that the conductive agent raw material set consists of graphene raw material, artificial graphite raw material, and conductive carbon black raw material. The auxiliary raw material set consists of active material and binder. The graphene raw material refers to a certain mass of graphene. The artificial graphite raw material refers to a certain mass of artificial graphite. The conductive carbon black raw material refers to a certain mass of carbon black with low-resistance or high-resistance properties. The active material refers to a certain mass of manganese dioxide. The binder refers to a certain mass of polyvinylidene fluoride.

[0095] S2. Identify an electrode preparation mechanism. The electrode preparation mechanism includes: a ball mill, an ultrasonic disperser, an electrospinning machine, a tube furnace, and a calender. The ball mill includes: a ball milling tank, grinding balls, a vacuum pump, and a pressure sensor. The ultrasonic disperser includes: a vacuum degassing machine, a densitometer, a thermometer, a viscometer, a turbidimeter, and an ultrasonic homogenizer.

[0096] It should be explained that the electrode preparation mechanism is a device integrating a ball mill, an ultrasonic disperser, an electrospinning machine, a tube furnace, and a calender. Optionally, a Miqi vertical planetary ball mill is used as the ball mill. The ball milling tank is a container in the ball mill for holding various materials (primary graphene, primary artificial graphite, primary ball milling raw materials, primary conductive carbon black, and intermediate ball milling raw materials) and grinding balls. The grinding balls are balls made of zirconia and are used in the ball mill to grind various materials. The main function of the vacuum pump is to extract the gas in the ball milling tank and create an environment close to vacuum or low pressure in the ball milling tank. The main function of the pressure sensor is to monitor the air pressure in the ball milling tank in real time. The ultrasonic disperser is a device integrating a vacuum degassing machine, a densitometer, a thermometer, a viscometer, a turbidimeter, and an ultrasonic homogenizer, and is used to perform ultrasonic mixing treatment on the mixed conductive raw materials and the auxiliary raw material set. The main function of the vacuum degassing machine is to remove the bubbles in the primary electrode slurry. Optionally, a Weina mixed degassing machine is used as the vacuum degassing machine. The densitometer is an instrument for detecting the density of the primary slurry sample. The thermometer is an instrument for detecting the temperature of the primary slurry sample. The viscometer is an instrument for detecting the dynamic viscosity of the primary slurry sample. The turbidimeter is an instrument for detecting the turbidity of the primary slurry sample. The ultrasonic homogenizer is an instrument that uses ultrasonic waves to disperse and mix the primary slurry. Optionally, a Hangzhou Jinghao Machinery ultrasonic solution homogenizer is used as the ultrasonic homogenizer. The electrospinning machine is a device that uses electrospinning technology to make a composite fiber membrane from the composite electrode slurry. Optionally, a Huizhi Electric Workshop HZ-02 electrospinning machine is used as the electrospinning machine, a Tianjin Bona Thermal Vacuum Atmosphere Tube Furnace is used as the tube furnace, and a Jinhaochuan Graphite Calender is used as the calender.

[0097] S3. Use a ball mill to perform segmented ball milling on the conductive agent raw material set to obtain mixed conductive raw materials. Use an ultrasonic disperser to perform ultrasonic mixing on the mixed conductive raw materials and the auxiliary raw material set to obtain a composite electrode slurry. Use an electrospinning machine to perform electrospinning on the composite electrode slurry to obtain a composite fiber membrane set.

[0098] Exemplarily, when using an electrospinning machine to perform electrospinning on the composite electrode slurry, the composite electrode slurry is ejected from the nozzle of the electrospinning machine and is converted into a charged jet under the action of a high voltage. Then, the charged jet is stretched under the drive of the electric field force, and as the solvent volatilizes, the charged jet gradually solidifies to form multiple fibers. The multiple fibers continuously accumulate on the receiving device (such as a roller or a mesh receiver) of the electrospinning machine, and finally form a fiber membrane. The fiber membrane is the composite fiber membrane. Collect multiple composite fiber membranes generated during the electrospinning process of the electrospinning machine on the composite electrode slurry to obtain a composite fiber membrane set.

[0099] It should be understood that the electrospinning technology is an existing technology and will not be elaborated here.

[0100] Specifically, the use of a ball mill to perform segmented ball milling on the conductive agent raw material set to obtain mixed conductive raw materials includes:

[0101] Obtain primary graphene, primary artificial graphite, and primary conductive carbon black based on the ball mill and the conductive agent raw material set;

[0102] Place the primary graphene into the ball mill jar to obtain a primary ball mill jar. Start the vacuum pump, use the started vacuum pump to perform a vacuuming operation on the primary ball mill jar, and use a pressure sensor to continuously monitor the updated air pressure in the primary ball mill jar during the vacuuming operation until the updated air pressure is less than or equal to a preset first air pressure threshold, then turn off the vacuum pump to obtain an updated ball mill jar;

[0103] Use a pre-built high-purity argon gas cylinder to fill the updated ball mill jar with argon gas, and use a pressure sensor to continuously monitor the target air pressure in the updated ball mill jar during the argon gas filling until the target air pressure is greater than or equal to a preset second air pressure threshold to obtain a target primary ball mill jar;

[0104] Use the ball mill to perform ball milling on the primary graphene in the target primary ball mill jar to obtain primary ball mill raw materials. Among them, the rotation speed and time of the ball mill performing ball milling on the primary graphene in the target primary ball mill jar are respectively a preset first ball milling rotation speed and a preset first ball milling time;

[0105] Place the primary artificial graphite and the primary ball mill raw materials into the ball mill jar to obtain an intermediate ball mill jar, and obtain a target intermediate ball mill jar based on the vacuum pump, the pressure sensor, the high-purity argon gas cylinder, and the intermediate ball mill jar;

[0106] Use a ball mill to perform a ball milling operation on the primary artificial graphite and primary ball milling raw materials in the target intermediate ball milling tank to obtain intermediate ball milling raw materials. Among them, the rotation speed and time for the ball mill to perform the ball milling operation on the primary artificial graphite and primary ball milling raw materials in the target intermediate ball milling tank are the second ball milling speed and the second ball milling time respectively, and the second ball milling speed is twice the first ball milling speed, and the second ball milling time is one-half of the first ball milling time;

[0107] Place the primary conductive carbon black and the intermediate ball milling raw materials into the ball milling tank of the ball mill to obtain a high-level ball milling tank, and obtain the target high-level ball milling tank based on a vacuum pump, a pressure sensor, a high-purity argon gas cylinder, and the high-level ball milling tank;

[0108] Use a ball mill to perform a ball milling operation on the primary conductive carbon black and the intermediate ball milling raw materials in the target high-level ball milling tank to obtain mixed conductive raw materials. Among them, the rotation speed and time for the ball mill to perform the ball milling operation on the primary conductive carbon black and the intermediate ball milling raw materials in the target high-level ball milling tank are the third ball milling speed and the third ball milling time respectively, and the third ball milling speed is twice the second ball milling speed, and the third ball milling time is one-half of the second ball milling time.

[0109] It should be explained that the primary ball milling tank is the ball milling tank in which the primary graphene is placed. The vacuumizing operation on the primary ball milling tank using the started vacuum pump means using the vacuum pump to extract the gas in the primary ball milling tank to create an environment close to vacuum or low pressure in the primary ball milling tank. Updating the tank pressure refers to the pressure in the primary ball milling tank. The high-purity argon gas cylinder is a gas cylinder filled with argon with a purity greater than 99%. The argon filling of the updated ball milling tank using the pre-built high-purity argon gas cylinder means that after connecting the high-purity argon gas cylinder to the updated ball milling tank, open the gas valve of the high-purity argon gas cylinder and slowly fill the updated ball milling tank with argon. The target tank pressure refers to the pressure in the updated ball milling tank. Optionally, the first pressure threshold is 0.01 Torr. The second pressure threshold is 0.1 MPa.

[0110] It should be understood that the ball milling operation on the primary graphene in the target primary ball milling tank using the ball mill means using the ball mill to control the rotation of the target primary ball milling tank, so that the grinding balls in the target primary ball milling tank impact, grind, and crush the primary graphene during the rotation. Preferably, the first ball milling speed is 200 revolutions per minute, and the first ball milling time is one hour.

[0111] It should be explained that the intermediate ball milling tank is the ball milling tank in which the primary artificial graphite and the primary ball milling raw materials are placed.

[0112] It is understandable that the method for obtaining the target intermediate ball milling tank based on the vacuum pump, the air pressure sensor, the high-purity argon gas cylinder and the intermediate ball milling tank, and the method for obtaining the target high-level ball milling tank based on the vacuum pump, the air pressure sensor, the high-purity argon gas cylinder and the high-level ball milling tank are the same as the method for obtaining the target primary ball milling tank by using the vacuum pump, the air pressure sensor, the high-purity argon gas cylinder and the primary ball milling tank, and will not be elaborated here.

[0113] It should be understood that the ball milling operation of the primary artificial graphite and the primary ball milling raw materials in the target intermediate ball milling tank by using the ball mill means: using the ball mill to control the rotation of the target intermediate ball milling tank, so that the grinding balls in the target primary ball milling tank impact, grind, crush and mix the primary graphene during the rotation. The method for obtaining the mixed conductive raw materials by performing the ball milling operation on the primary conductive carbon black and the intermediate ball milling raw materials in the target high-level ball milling tank by using the ball mill is the same as the method for obtaining the intermediate ball milling raw materials by performing the ball milling operation on the primary artificial graphite and the primary ball milling raw materials in the target intermediate ball milling tank by using the ball mill, and will not be elaborated here.

[0114] Specifically, the obtaining of the primary graphene, the primary artificial graphite and the primary conductive carbon black based on the ball mill and the conductive agent raw material set includes:

[0115] Confirm the grinding ball quality of the grinding balls in the ball mill, and calculate the graphene quality according to the grinding ball quality. The calculation formula is as follows:

[0116]

[0117] Among them, m Gs is the graphene quality, m X is the grinding ball quality, and k x is the preset ball-to-material ratio;

[0118] Calculate the artificial graphite quality according to the graphene quality and the preset first raw material ratio. The calculation formula is as follows:

[0119]

[0120] Among them, m Gra is the artificial graphite quality, and k 1 is the first raw material ratio;

[0121] Obtain the conductive carbon black quality based on the graphene quality and the preset second raw material ratio;

[0122] Primary graphene is extracted from the graphene raw materials in the conductive agent raw material set based on the mass of graphene, primary artificial graphite is extracted from the artificial graphite raw materials in the conductive agent raw material set based on the mass of artificial graphite, and primary conductive carbon black is extracted from the conductive carbon black raw materials in the conductive agent raw material set based on the mass of conductive carbon black. Among them, the masses of the primary graphene, primary artificial graphite, and primary conductive carbon black are the mass of graphene, the mass of artificial graphite, and the mass of conductive carbon black, respectively.

[0123] It should be explained that the mass of the grinding balls refers to the mass of the grinding balls. The ball-to-material ratio is the ratio of the mass of the grinding balls set artificially to the mass of graphene required during ball milling. Preferably, the ball-to-material ratio is 10. The first raw material ratio is the ratio of the mass of graphene required to manufacture the mixed conductive raw material to the mass of artificial graphite. The second raw material ratio is the ratio of the mass of graphene required to manufacture the mixed conductive raw material to the mass of conductive carbon black. Preferably, the first raw material ratio is 0.5 and the second raw material ratio is 0.3.

[0124] It should be understood that the method for obtaining the mass of conductive carbon black based on the mass of graphene and the preset second raw material ratio is the same as the method for obtaining the mass of artificial graphite using the mass of graphene and the first raw material ratio, and will not be elaborated here.

[0125] Exemplarily, graphene with a mass equal to the mass of graphene is extracted from the graphene raw materials as primary graphene, artificial graphite with a mass equal to the mass of artificial graphite is extracted from the artificial graphite raw materials as primary artificial graphite, and conductive carbon black with a mass equal to the mass of conductive carbon black is extracted from the conductive carbon black raw materials as primary conductive carbon black.

[0126] Specifically, the ultrasonic dispersion instrument is used to perform ultrasonic mixing treatment on the mixed conductive raw material and the auxiliary raw material set to obtain a composite electrode slurry, including:

[0127] Weigh the mixed conductive raw material to obtain the mass of the mixed raw material;

[0128] Based on the mass of the mixed raw material and the preset third raw material ratio, obtain the mass of the active material, and based on the mass of the mixed raw material and the preset fourth raw material ratio, obtain the mass of the binder;

[0129] Based on the mass of the active material, extract primary active material from the active material in the auxiliary raw material set, and based on the mass of the binder, extract primary binder from the binder in the auxiliary raw material set. Among them, the masses of the primary active material and the primary binder are the mass of the active material and the mass of the binder, respectively;

[0130] Perform liquid mixing on the mixed conductive raw material, primary active material, and primary binder to obtain a raw slurry, and place the raw slurry into an ultrasonic homogenizer to obtain a primary slurry;

[0131] Input the preset initial ultrasonic frequency and the preset initial power into the ultrasonic homogenizer to obtain the target homogenizer;

[0132] Start the target homogenizer, record the time in real-time starting from the time when the target homogenizer is started to obtain the ultrasonic time, and use the target homogenizer to perform a homogenization mixing operation on the primary slurry. When the ultrasonic time reaches the preset homogenization time threshold, turn off the target homogenizer to obtain the primary electrode slurry;

[0133] Extract a primary slurry sample from the primary electrode slurry, and use a densitometer, a thermometer, a viscometer, and a turbidimeter to perform detection operations on the primary slurry sample to obtain the slurry density, the slurry temperature, the slurry dynamic viscosity, and the slurry turbidity;

[0134] Calculate the slurry uniformity index based on the slurry density, the slurry temperature, the slurry dynamic viscosity, and the slurry turbidity, and compare the slurry uniformity index with the preset slurry uniformity threshold;

[0135] If the slurry uniformity index is greater than or equal to the preset slurry uniformity threshold, use a vacuum degassing machine to perform a vacuum degassing operation on the primary electrode slurry to obtain the composite electrode slurry;

[0136] If the slurry uniformity index is less than the slurry uniformity threshold, calculate the corrected ultrasonic frequency and the corrected power based on the slurry density, the slurry temperature, the slurry dynamic viscosity, the slurry turbidity, the initial ultrasonic frequency, and the initial power. Take the corrected ultrasonic frequency as the initial ultrasonic frequency, take the corrected power as the initial power, take the primary electrode slurry as the primary slurry, and return to the step of inputting the preset initial ultrasonic frequency and the preset initial power into the ultrasonic homogenizer until the slurry uniformity index is greater than or equal to the slurry uniformity threshold.

[0137] It should be noted that the mass of the mixed raw materials refers to the mass of the mixed conductive raw materials. The third raw material ratio is the ratio of the mass of the mixed conductive raw materials required for manufacturing the original slurry to the mass of the active material, and the fourth raw material ratio is the ratio of the mass of the mixed conductive raw materials required for manufacturing the original slurry to the mass of the binder. Preferably, the third raw material ratio is 0.12 and the fourth raw material ratio is 2.

[0138] It should be noted that the initial ultrasonic frequency refers to the frequency of the ultrasonic wave emitted by the ultrasonic homogenizer during operation, and the initial power refers to the power of the ultrasonic homogenizer during operation. The target homogenizer is the ultrasonic homogenizer after setting the initial ultrasonic frequency and the initial power. Preferably, the initial ultrasonic frequency is 20000 hz and the initial power is 50 W.

[0139] It is understandable that the liquid mixing operation performed on the mixed conductive raw material, primary active material, and primary binder refers to dissolving the mixed conductive raw material, primary active material, and primary binder into a certain mass of deionized water. The original slurry refers to the solution in which the mixed conductive raw material, primary active material, and primary binder are dissolved. The primary slurry refers to the original slurry placed in an ultrasonic homogenizer.

[0140] It should be understood that the homogenizing and mixing operation performed on the primary slurry using the target homogenizer means: using the target homogenizer to emit ultrasonic waves, and using the physical effects (such as cavitation and shear force) generated by the high-frequency vibration of the ultrasonic waves to quickly disperse, break, or mix the mixed conductive raw material, primary active material, and primary binder in the primary slurry. And the technology of performing the homogenizing and mixing operation on the primary slurry using the target homogenizer is an existing technology, which will not be elaborated here.

[0141] Exemplarily, if the time to start the target homogenizer is 10:00, then at 10:02, the ultrasonic time is 2 minutes. If the homogenizing time threshold is 10 minutes, then at 10:10, the target homogenizer is turned off, and the primary electrode slurry is extracted from the target homogenizer. The primary electrode slurry is the primary slurry after the homogenizing and mixing operation.

[0142] It should be explained that extracting the primary slurry sample from the primary electrode slurry means: extracting a certain mass of the primary electrode slurry as the primary slurry sample. The slurry density, slurry temperature, slurry dynamic viscosity, and slurry turbidity respectively refer to the density, temperature, dynamic viscosity, and turbidity of the primary slurry sample. And the technology of performing the detection operation on the primary slurry sample using a densitometer, thermometer, viscometer, and turbidimeter is an existing technology, which will not be elaborated here.

[0143] It should be understood that performing the vacuum degassing operation on the primary electrode slurry using the vacuum degassing machine means using the vacuum degassing machine to remove the bubbles existing in the primary electrode slurry. And the technology of performing the vacuum degassing operation on the primary electrode slurry using the vacuum degassing machine is an existing technology, which will not be elaborated here.

[0144] It is understandable that the slurry uniformity index reflects the degree of uniformity of the mixing of the mixed conductive raw material, primary active material, and primary binder in the primary electrode slurry. The higher the slurry uniformity index, the more uniform the mixing of the mixed conductive raw material, primary active material, and primary binder in the primary electrode slurry. The slurry uniformity threshold is set by the staff of the electrode material manufacturing factory according to experience. For example, the staff takes the average value of the slurry uniformity indexes of multiple qualified primary electrode slurries produced by the factory historically as the slurry uniformity threshold.

[0145] Specifically, the calculation formula of the slurry uniformity index is as follows:

[0146]

[0147] Among them, φ H is the slurry uniformity index, T H is the slurry temperature, T 0 is the preset initial temperature, σ TU is the slurry turbidity, μ dv is the dynamic viscosity of the slurry, ρ H is the slurry density, tanh is the hyperbolic tangent function, and e is the natural constant.

[0148] Optionally, the initial temperature is 25 degrees Celsius.

[0149] Specifically, calculating the corrected ultrasonic frequency and corrected power according to the slurry density, slurry temperature, dynamic viscosity of the slurry, slurry turbidity, initial ultrasonic frequency and initial power includes:

[0150] Calculating the corrected ultrasonic frequency according to the slurry turbidity, dynamic viscosity of the slurry, slurry density and initial ultrasonic frequency, and the calculation formula is as follows:

[0151]

[0152] Among them, v sou is the corrected ultrasonic frequency, v 0 is the initial ultrasonic frequency;

[0153] Calculating the corrected power according to the slurry temperature and initial power, and the calculation formula is as follows:

[0154]

[0155] Among them, p sou is the corrected power, p 0 is the initial power, T c is the preset reference temperature.

[0156] It should be explained that the corrected ultrasonic frequency is the frequency of the ultrasonic wave used to replace the initial ultrasonic frequency in the target homogenizer. The corrected power is the power used to replace the initial power in the target homogenizer.

[0157] It should be understood that in the embodiments of the present invention, the initial ultrasonic frequency and initial power are corrected by the slurry temperature, slurry turbidity, dynamic viscosity of the slurry, and slurry density, and the more appropriate corrected ultrasonic frequency and corrected power for performing the homogenization mixing operation on the primary slurry are calculated, thereby improving the mixing effect of performing the homogenization mixing operation on the primary slurry.

[0158] S4. Extract the composite fiber membrane from the composite fiber membrane set. Use the composite fiber membrane set from which the composite fiber membrane is extracted as the updated fiber membrane set, and perform the following operations on the extracted composite fiber membrane: Use a tubular furnace and a preset initial temperature to perform a high-temperature sintering operation on the composite fiber membrane to obtain a composite carbonized material. Use a preset initial pressure and a rolling machine to perform a rolling treatment on the composite carbonized material to obtain a standard electrode material.

[0159] It should be explained that the composite fiber membrane set includes multiple composite fiber membranes. The extraction of the composite fiber membrane from the composite fiber membrane set means extracting one composite fiber membrane from the multiple composite fiber membranes in the composite fiber membrane set.

[0160] It can be understood that the use of a preset initial pressure and a rolling machine to perform a rolling treatment on the composite carbonized material means: Set the pressure of the rolling machine to the initial pressure and use the rolling machine to perform a rolling treatment on the composite carbonized material. And the technology of using a preset initial pressure and a rolling machine to perform a rolling treatment on the composite carbonized material is an existing technology and will not be elaborated here. The standard electrode material refers to the composite carbonized material after being rolled by the rolling machine.

[0161] Preferably, the initial temperature is 800 degrees Celsius and the initial pressure is 10 MPa.

[0162] Specifically, the use of a tubular furnace and a preset initial temperature to perform a high-temperature sintering operation on the composite fiber membrane to obtain a composite carbonized material includes:

[0163] Confirm the relay temperature based on the initial temperature, where the relay temperature is half of the initial temperature;

[0164] Place the composite fiber membrane into the tubular furnace to obtain the initial tubular furnace. Use a high-purity argon gas cylinder to perform an argon filling operation on the initial tubular furnace to obtain the target tubular furnace;

[0165] Start the target tubular furnace and use the started target tubular furnace to burn the composite fiber membrane. The temperature at which the target tubular furnace burns the composite fiber membrane is the relay temperature. Starting from the time when the target tubular furnace is started and recording the time in real time, obtain the first sintering time. Until the first sintering time reaches the preset first time threshold, close the target tubular furnace to obtain the initial carbonized material;

[0166] Start the target tubular furnace and use the started target tubular furnace to burn the initial carbonized material. The temperature at which the target tubular furnace burns the initial carbonized material is the initial temperature. Starting from the time when the target tubular furnace is started and recording the time in real time, obtain the second sintering time. Until the second sintering time reaches the preset second time threshold, close the target tubular furnace to obtain the composite carbonized material, where the second time threshold is half of the first time threshold.

[0167] It should be noted that the initial tubular furnace is a tubular furnace in which a composite fiber membrane is placed. The operation of filling the updated ball milling tank with argon using a high-purity argon gas cylinder means that after connecting the high-purity argon gas cylinder to the initial tubular furnace, the gas valve of the high-purity argon gas cylinder is opened to slowly fill the initial tubular furnace with argon.

[0168] Exemplarily, start the target tubular furnace and set the working temperature of the target tubular furnace to the relay temperature. Since the target tubular furnace is filled with argon, the composite fiber membrane is burned at a high temperature in the argon environment of the target tubular furnace. If the start time of the target tubular furnace is 12:00, then starting from 12:00, record the time in real time. When it is 12:02, the first sintering time is 2 minutes. If the first time threshold is set to 30 minutes, then at 12:30, turn off the target tubular furnace. Then set the working temperature of the target tubular furnace to the initial temperature, and continue to burn the initial carbonized material in the target tubular furnace at a high temperature. If the second time threshold is 15 minutes, then at 12:45, turn off the target tubular furnace, and extract the composite carbonized material from the target tubular furnace.

[0169] S5. Extract a standard electrode sample from the standard electrode material, perform pore conductivity analysis on the standard electrode sample to obtain a comprehensive conductivity index, and compare the comprehensive conductivity index with a preset conductivity threshold.

[0170] It should be understood that extracting the standard electrode sample from the standard electrode material means cutting a certain mass of the standard electrode material as the standard electrode sample. The conductivity threshold is set by the factory staff according to the factory's production requirements or production experience.

[0171] Specifically, performing pore conductivity analysis on the standard electrode sample to obtain a comprehensive conductivity index includes:

[0172] Performing a weighing operation on the standard electrode sample to obtain the standard sample mass;

[0173] Using a pre-built mercury intrusion porosimeter to perform mercury intrusion testing on the standard electrode sample to obtain the mercury liquid filling volume, where the test pressure for the mercury intrusion porosimeter to perform mercury intrusion testing on the standard electrode sample is preset;

[0174] Calculating the sample void index according to the mercury liquid filling volume, the standard sample mass, and the test pressure. The calculation formula is as follows:

[0175]

[0176] where, ε v is the sample void index, V Hg is the mercury liquid filling volume, ρ Hg is the preset density of mercury, m b is the standard sample mass, P xFor the test pressure, ln is the natural logarithm;

[0177] The comprehensive conductivity index is calculated according to the sample void index, and the calculation formula is as follows:

[0178]

[0179] Wherein, I xc is the comprehensive conductivity index, ε 0 is the preset reference pore index, m I , m 1 and m 2 are the mass of the mixed raw material, the mass of the active material, and the mass of the binder, respectively.

[0180] It should be explained that the standard sample mass refers to the mass of the standard electrode sample. Optionally, a Micromeritics Autopore IV 9500 mercury intrusion porosimeter is used as the mercury intrusion porosimeter. The performing of the mercury intrusion test on the standard electrode sample by using the pre-constructed mercury intrusion porosimeter means: testing the volume of mercury that can be pressed into the standard electrode sample by the mercury intrusion porosimeter under the test pressure applied by the mercury intrusion porosimeter by using the mercury intrusion method. The mercury liquid filling volume is the volume of mercury that can be pressed into the standard electrode sample by the mercury intrusion porosimeter under the test pressure.

[0181] It should be understood that there are many pores inside the standard electrode sample, so a certain volume of mercury can be pressed into it under the condition that the mercury intrusion porosimeter applies the test pressure. And the mercury intrusion method is an existing technology, which will not be elaborated here. Exemplarily, the mercury intrusion porosimeter will automatically output a test report after performing the mercury intrusion test on the standard electrode sample, and the mercury liquid filling volume can be read from the test report.

[0182] It can be understood that the sample void index reflects the porosity of the standard electrode sample. The larger the sample void index, the larger the porosity of the standard electrode sample.

[0183] It should be understood that when the porosity of the standard electrode sample is too high, the pores, as insulating regions, will reduce the continuous conductive channels in the standard electrode sample, hinder electron transport, and cause the conductivity of the standard electrode sample to be too low. When the porosity is too low, when the standard electrode material corresponding to the standard electrode sample is used to make the electrode of the battery, the electrolyte in the battery is difficult to penetrate the standard electrode material, resulting in limited paths for ion diffusion in the electrolyte, and further causing the conductivity of the standard electrode sample to be too low. And the ratio among the mass of the mixed raw material, the mass of the active material, and the mass of the binder reflects the ratio of the mixed conductive raw material, the active material, and the binder in the standard electrode material for manufacturing, and will also affect the conductivity of the standard electrode material. Therefore, the comprehensive conductivity index reflects the conductivity of the standard electrode material corresponding to the standard electrode sample. The larger the comprehensive conductivity index, the larger the conductivity of the standard electrode material.

[0184] Exemplarily, the staff determines the average value of the sample void indices of multiple pre-produced and qualified standard electrode materials in the factory as the reference pore index.

[0185] Specifically, the calculating of the updated temperature and the updated pressure using the initial temperature and the initial pressure includes:

[0186] Calculating the updated temperature according to the sample void index, the reference pore index, and the initial temperature. The calculation formula is as follows:

[0187]

[0188] where, T y is the updated temperature, and T x is the initial temperature;

[0189] Calculating the updated pressure based on the sample void index, the reference pore index, and the initial pressure.

[0190] It should be understood that the method of calculating the updated pressure based on the sample void index, the reference pore index, and the initial pressure is the same as the method of calculating the updated temperature using the sample void index, the reference pore index, and the initial temperature, and will not be elaborated here.

[0191] S6. If the comprehensive conductivity index is greater than or equal to the conductivity threshold, then use the standard electrode material after extracting the standard electrode sample as the target electrode material, use the updated fiber membrane set as the composite fiber membrane set, and return to the step of extracting the composite fiber membrane from the composite fiber membrane set until there is no composite fiber membrane in the composite fiber membrane set.

[0192] S7. If the comprehensive conductivity index is less than the conductivity threshold, then calculate the updated temperature and the updated pressure using the initial temperature and the initial pressure, use the updated temperature as the initial temperature, use the updated pressure as the initial pressure, use the updated fiber membrane set as the composite fiber membrane set, and return to the step of extracting the composite fiber membrane from the composite fiber membrane set until there is no composite fiber membrane in the composite fiber membrane set.

[0193] It should be understood that in the embodiments of the present invention, the initial temperature is replaced by the updated temperature, and the initial pressure is replaced by the updated pressure. In the process of extracting the composite fiber membrane again and again, the initial temperature in the high-temperature sintering process and the initial pressure in the rolling process are continuously optimized, thereby improving the product quality of the standard electrode material.

[0194] S8. Summarize the target electrode materials to obtain a target electrode material set, and complete the preparation of the needle-type lithium battery electrode material.

[0195] Exemplarily, the target electrode materials in the target electrode material set are the electrode materials doped with graphene required by the factory for manufacturing needle-type lithium batteries.

[0196] To solve the problems described in the background art, the present invention obtains a conductive agent raw material set and an auxiliary raw material set. Among them, the conductive agent raw material set includes: graphene raw material, artificial graphite raw material, and conductive carbon black raw material, and the auxiliary raw material set includes: active material and binder. It can be seen that the embodiments of the present invention provide a raw material basis for the subsequent preparation of the composite electrode slurry by obtaining the conductive agent raw material set and the auxiliary raw material set, and then confirm the electrode preparation mechanism. Among them, the electrode preparation mechanism includes: ball mill, ultrasonic disperser, electrospinning machine, tube furnace, and calender. Among them, the ball mill includes: ball mill tank, grinding balls, vacuum pump, and air pressure sensor. The ultrasonic disperser includes: vacuum degassing machine, densitometer, thermometer, viscometer, turbidimeter, and ultrasonic homogenizer. It can be seen that the embodiments of the present invention provide necessary equipment and a complete preparation environment for the preparation process of the electrode material by confirming the electrode preparation mechanism. Use the ball mill to perform segmented ball milling on the conductive agent raw material set to obtain mixed conductive raw materials, use the ultrasonic disperser to perform ultrasonic mixing on the mixed conductive raw materials and the auxiliary raw material set to obtain composite electrode slurry, and use the electrospinning machine to perform electrospinning on the composite electrode slurry to obtain a composite fiber membrane set. It can be seen that the embodiments of the present invention sufficiently mix the conductive agent raw material set and the auxiliary raw material set through the ball mill and the ultrasonic disperser, and then use electrospinning to form a composite fiber membrane with higher conductivity from the composite electrode slurry, improving the conductivity and product quality of the electrode material. Extract the composite fiber membrane from the composite fiber membrane set, use the composite fiber membrane set from which the composite fiber membrane has been extracted as the updated fiber membrane set, and perform the following operations on the extracted composite fiber membrane: use the tube furnace and the preset initial temperature to perform high-temperature sintering on the composite fiber membrane to obtain composite carbonized material, and use the preset initial pressure and the calender to perform calendering on the composite carbonized material to obtain standard electrode material. It can be seen that the embodiments of the present invention further improve the structural stability and conductivity of the composite fiber membrane through the high-temperature sintering process of the tube furnace and the calendering treatment of the calender. Extract the standard electrode sample from the standard electrode material, perform pore conductivity analysis on the standard electrode sample to obtain a comprehensive conductivity index, compare the comprehensive conductivity index with the preset conductivity threshold. If the comprehensive conductivity index is greater than or equal to the conductivity threshold, use the standard electrode material after extracting the standard electrode sample as the target electrode material, use the updated fiber membrane set as the composite fiber membrane set, and return to the step of extracting the composite fiber membrane from the composite fiber membrane set until there is no composite fiber membrane in the composite fiber membrane set. If the comprehensive conductivity index is less than the conductivity threshold, calculate the updated temperature and updated pressure using the initial temperature and initial pressure, use the updated temperature as the initial temperature, use the updated pressure as the initial pressure, use the updated fiber membrane set as the composite fiber membrane set, and return to the step of extracting the composite fiber membrane from the composite fiber membrane set until there is no composite fiber membrane in the composite fiber membrane set. Aggregate the target electrode materials to obtain a target electrode material set, and complete the preparation of the needle-type lithium battery electrode material. It can be seen that the embodiments of the present invention screen qualified target electrode materials through the comprehensive conductivity index.Improve the automation degree of the electrode material preparation process, and at the same time use the comprehensive conductivity index to regulate the initial temperature and initial pressure, optimize the high-temperature sintering process of the tube furnace and the process parameters of the calendering treatment of the calender, and further improve the product quality of the electrode material. Therefore, the present invention can improve the automation degree of the electrode material preparation process, and improve the conductivity and product quality of the electrode material.

[0197] As Figure 2 shown, it is a functional module diagram of a needle-type lithium battery electrode material preparation system based on graphene doping provided by an embodiment of the present invention.

[0198] The needle-type lithium battery electrode material preparation system 100 based on graphene doping of the present invention can be installed in an electronic device. According to the functions achieved, the needle-type lithium battery electrode material preparation system 100 based on graphene doping can include a preparation material preparation module 101, a conductive raw material mixing module 102, a composite material processing module 103, and a conductive performance evaluation module 104. The modules of the present invention can also be referred to as units, which refer to a series of computer program segments that can be executed by an electronic device processor and can complete fixed functions, and are stored in the memory of the electronic device.

[0199] The preparation material preparation module 101 is used to obtain a conductive agent raw material set and an auxiliary raw material set. Among them, the conductive agent raw material set includes: graphene raw material, artificial graphite raw material, and conductive carbon black raw material, and the auxiliary raw material set includes: active material and binder. Confirm the electrode preparation mechanism. Among them, the electrode preparation mechanism includes: ball mill, ultrasonic disperser, electrospinning machine, tube furnace, and calender. Among them, the ball mill includes: ball mill tank, grinding balls, vacuum pump, and air pressure sensor. The ultrasonic disperser includes: vacuum degassing machine, density meter, thermometer, viscometer, turbidimeter, and ultrasonic homogenizer;

[0200] The conductive raw material mixing module 102 is used to perform segmented ball milling on the conductive agent raw material set by using a ball mill to obtain mixed conductive raw materials, perform ultrasonic mixing on the mixed conductive raw materials and the auxiliary raw material set by using an ultrasonic disperser to obtain composite electrode slurries, and perform electrospinning on the composite electrode slurries by using an electrospinning machine to obtain a composite fiber membrane set;

[0201] The composite material processing module 103 is used to extract a composite fiber membrane from the composite fiber membrane set, use the extracted composite fiber membrane set as an updated fiber membrane set, and perform the following operations on the extracted composite fiber membrane: perform high-temperature sintering on the composite fiber membrane by using a tube furnace and a preset initial temperature to obtain a composite carbonized material, and perform calendering treatment on the composite carbonized material by using a preset initial pressure and a calender to obtain a standard electrode material;

[0202] The conductivity evaluation module 104 is configured to extract a standard electrode sample from a standard electrode material, perform pore conductivity analysis on the standard electrode sample to obtain a comprehensive conductivity index, compare the comprehensive conductivity index with a preset conductivity threshold. If the comprehensive conductivity index is greater than or equal to the conductivity threshold, the standard electrode material after extracting the standard electrode sample is used as the target electrode material, and the updated fiber membrane set is used as the composite fiber membrane set, and the step of extracting the composite fiber membrane from the composite fiber membrane set is returned until there is no composite fiber membrane in the composite fiber membrane set. If the comprehensive conductivity index is less than the conductivity threshold, the updated temperature and updated pressure are calculated using the initial temperature and initial pressure, the updated temperature is used as the initial temperature, the updated pressure is used as the initial pressure, the updated fiber membrane set is used as the composite fiber membrane set, and the step of extracting the composite fiber membrane from the composite fiber membrane set is returned until there is no composite fiber membrane in the composite fiber membrane set. The target electrode materials are summarized to obtain a target electrode material set, and the preparation of the needle-type lithium battery electrode material is completed.

[0203] Specifically, each module in the needle-type lithium battery electrode material preparation system 100 based on graphene doping in the embodiments of the present invention uses the same technical means as those Figure 1 described in the needle-type lithium battery electrode material preparation method based on graphene doping, and can produce the same technical effects, which will not be elaborated here.

[0204] As Figure 3 shown, it is a schematic structural diagram of an electronic device for implementing the needle-type lithium battery electrode material preparation method based on graphene doping provided by an embodiment of the present invention.

[0205] The electronic device 1 may include a processor 10, a memory 11, and a bus 12, and may further include a computer program stored in the memory 11 and executable on the processor 10, such as a needle-type lithium battery electrode material preparation method program based on graphene doping.

[0206] Among them, the memory 11 includes at least one type of readable storage medium, and the readable storage medium includes flash memory, mobile hard disk, multimedia card, card-type memory (such as SD or DX memory, etc.), magnetic memory, magnetic disk, optical disc, etc. In some embodiments, the memory 11 may be an internal storage unit of the electronic device 1, such as the mobile hard disk of the electronic device 1. In some other embodiments, the memory 11 may also be an external storage device of the electronic device 1, such as a plug-in mobile hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, etc. equipped on the electronic device 1. Further, the memory 11 also includes the internal storage unit of the electronic device 1 and also includes an external storage device. The memory 11 can not only be used to store application software installed in the electronic device 1 and various types of data, such as the code of the program for the preparation method of the needle-shaped lithium battery electrode material based on graphene doping, etc., but also can be used to temporarily store the data that has been output or will be output.

[0207] In some embodiments, the processor 10 may be composed of integrated circuits. For example, it may be composed of a single packaged integrated circuit, or may be composed of multiple integrated circuits with the same or different functions packaged, including a combination of one or more Central Processing Units (CPUs), microprocessors, digital processing chips, graphics processors, and various control chips, etc. The processor 10 is the control core (Control Unit) of the electronic device, connecting all components of the entire electronic device through various interfaces and lines, and by running or executing the programs or modules stored in the memory 11 (such as the program for the preparation method of the needle-shaped lithium battery electrode material based on graphene doping, etc.), and calling the data stored in the memory 11, to execute various functions of the electronic device 1 and process data.

[0208] The bus 12 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This bus 12 can be divided into an address bus, a data bus, a control bus, etc. The bus 12 is set to realize the connection and communication between the memory 11 and at least one processor 10, etc.

[0209] Figure 3 Only the electronic device with components is shown. Those skilled in the art can understand that Figure 3The structure shown does not constitute a limitation on the electronic device 1, and it may include fewer or more components than shown, or combine certain components, or have a different component arrangement.

[0210] For example, although not shown, the electronic device 1 may further include a power source (such as a battery) for powering each component. Preferably, the power source can be logically connected to the at least one processor 10 through a power management device, so as to implement functions such as charge management, discharge management, and power consumption management through the power management device. The power source may also include any components such as one or more DC or AC power sources, a recharge device, a power failure detection circuit, a power converter or inverter, and a power status indicator. The electronic device 1 may also include various sensors, a Bluetooth module, a Wi-Fi module, etc., which will not be elaborated here.

[0211] Furthermore, the electronic device 1 may further include a network interface. Optionally, the network interface may include a wired interface and / or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which is generally used to establish a communication connection between the electronic device 1 and other electronic devices.

[0212] Optionally, the electronic device 1 may further include a user interface. The user interface may be a display (Display), an input unit (such as a keyboard), and optionally, the user interface may also be a standard wired interface or a wireless interface. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch liquid crystal display, and an OLED (Organic Light-Emitting Diode) toucher, etc. Among them, the display may also be appropriately referred to as a display screen or a display unit, which is used to display the information processed in the electronic device 1 and to display a visual user interface.

[0213] The program for the preparation method of the graphene-doped needle-type lithium battery electrode material stored in the memory 11 of the electronic device 1 is a combination of multiple instructions. When running in the processor 10, it can achieve:

[0214] Obtain a conductive agent raw material set and an auxiliary raw material set. Among them, the conductive agent raw material set includes: graphene raw material, artificial graphite raw material, and conductive carbon black raw material, and the auxiliary raw material set includes: active material and binder;

[0215] Identify the electrode preparation mechanism. Among them, the electrode preparation mechanism includes: a ball mill, an ultrasonic disperser, an electrospinning machine, a tubular furnace, and a calender. Among them, the ball mill includes: a ball mill tank, grinding balls, a vacuum pump, and a gas pressure sensor, and the ultrasonic disperser includes: a vacuum degassing machine, a densitometer, a thermometer, a viscometer, a turbidimeter, and an ultrasonic homogenizer;

[0216] The conductive agent raw material set is subjected to segmented ball milling treatment by a ball mill to obtain a mixed conductive raw material. The mixed conductive raw material and the auxiliary raw material set are subjected to ultrasonic mixing treatment by an ultrasonic disperser to obtain a composite electrode slurry. The composite electrode slurry is subjected to electrospinning by an electrospinning machine to obtain a composite fiber membrane set;

[0217] The composite fiber membrane is extracted from the composite fiber membrane set. The composite fiber membrane set from which the composite fiber membrane is extracted is used as the updated fiber membrane set, and the following operations are performed on the extracted composite fiber membrane:

[0218] The composite fiber membrane is subjected to high-temperature sintering operation by a tubular furnace and a preset initial temperature to obtain a composite carbonized material. The composite carbonized material is subjected to rolling treatment by a preset initial pressure and a rolling mill to obtain a standard electrode material;

[0219] The standard electrode sample is extracted from the standard electrode material, pore conductivity analysis is performed on the standard electrode sample to obtain a comprehensive conductivity index, and the comprehensive conductivity index is compared with a preset conductivity threshold;

[0220] If the comprehensive conductivity index is greater than or equal to the conductivity threshold, the standard electrode material after extracting the standard electrode sample is used as the target electrode material, the updated fiber membrane set is used as the composite fiber membrane set, and the step of extracting the composite fiber membrane from the composite fiber membrane set is returned until there is no composite fiber membrane in the composite fiber membrane set;

[0221] If the comprehensive conductivity index is less than the conductivity threshold, the updated temperature and the updated pressure are calculated using the initial temperature and the initial pressure. The updated temperature is used as the initial temperature, the updated pressure is used as the initial pressure, the updated fiber membrane set is used as the composite fiber membrane set, and the step of extracting the composite fiber membrane from the composite fiber membrane set is returned until there is no composite fiber membrane in the composite fiber membrane set;

[0222] The target electrode materials are summarized to obtain a target electrode material set, and the preparation of the needle-type lithium battery electrode material is completed.

[0223] Specifically, the specific implementation method of the processor 10 for the above instructions can refer to Figures 1 to 3 the description of the relevant steps in the corresponding embodiment, which will not be elaborated here.

[0224] Furthermore, if the modules / units integrated in the electronic device 1 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. The computer-readable storage medium can be volatile or non-volatile. For example, the computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a mobile hard disk, a magnetic disk, an optical disc, a computer memory, a read-only memory (ROM, Read-Only Memory).

[0225] The present invention also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor of an electronic device, it can implement:

[0226] Obtain a conductive agent raw material set and an auxiliary raw material set, where the conductive agent raw material set includes: graphene raw material, artificial graphite raw material, and conductive carbon black raw material, and the auxiliary raw material set includes: active material and binder;

[0227] Identify an electrode preparation mechanism, where the electrode preparation mechanism includes: a ball mill, an ultrasonic disperser, an electrospinning machine, a tube furnace, and a calender. Among them, the ball mill includes: a ball milling tank, grinding balls, a vacuum pump, and a pressure sensor, and the ultrasonic disperser includes: a vacuum degassing machine, a densitometer, a thermometer, a viscometer, a turbidimeter, and an ultrasonic homogenizer;

[0228] Perform segmented ball milling on the conductive agent raw material set using the ball mill to obtain a mixed conductive raw material, perform ultrasonic mixing on the mixed conductive raw material and the auxiliary raw material set using the ultrasonic disperser to obtain a composite electrode slurry, and perform electrospinning on the composite electrode slurry using the electrospinning machine to obtain a composite fiber membrane set;

[0229] Extract a composite fiber membrane from the composite fiber membrane set, use the composite fiber membrane set from which the composite fiber membrane has been extracted as an updated fiber membrane set, and perform the following operations on the extracted composite fiber membrane:

[0230] Perform high-temperature sintering on the composite fiber membrane using the tube furnace and a preset initial temperature to obtain a composite carbonized material, and perform calendering on the composite carbonized material using a preset initial pressure and the calender to obtain a standard electrode material;

[0231] Extract a standard electrode sample from the standard electrode material, perform pore conductivity analysis on the standard electrode sample to obtain a comprehensive conductivity index, and compare the comprehensive conductivity index with a preset conductivity threshold;

[0232] If the comprehensive conductance index is greater than or equal to the conductance threshold, the standard electrode material after extracting the standard electrode sample is used as the target electrode material, the updated fiber membrane set is used as the composite fiber membrane set, and the step of extracting the composite fiber membrane from the composite fiber membrane set is returned until there is no composite fiber membrane in the composite fiber membrane set;

[0233] If the comprehensive conductance index is less than the conductance threshold, the updated temperature and updated pressure are calculated using the initial temperature and initial pressure, the updated temperature is used as the initial temperature, the updated pressure is used as the initial pressure, the updated fiber membrane set is used as the composite fiber membrane set, and the step of extracting the composite fiber membrane from the composite fiber membrane set is returned until there is no composite fiber membrane in the composite fiber membrane set;

[0234] Summarize the target electrode materials to obtain a target electrode material set, and complete the preparation of the needle-type lithium battery electrode materials.

[0235] In several embodiments provided by the present invention, it should be understood that the disclosed devices, systems and methods can be implemented in other ways. For example, the system embodiments described above are only illustrative, and there may be other division methods in actual implementation.

[0236] The module described as a separation component may or may not be physically separated, and the component shown as a module may or may not be a physical unit, that is, it may be located in one place, or it may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0237] In addition, in each embodiment of the present invention, the functional modules can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated unit can be implemented in the form of hardware, or in the form of hardware plus software functional modules.

[0238] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

[0239] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a needle-type lithium battery electrode material based on graphene doping, characterized in that: The method comprises: Obtaining a conductive agent raw material set and an auxiliary raw material set, wherein the conductive agent raw material set includes: graphene raw material, artificial graphite raw material and conductive carbon black raw material, and the auxiliary raw material set includes: active material and binder; Confirm the electrode preparation mechanism, wherein the electrode preparation mechanism includes: a ball mill, an ultrasonic disperser, an electrospinning machine, a tubular furnace and a calender, wherein the ball mill includes: a ball mill, grinding balls, a vacuum pump and an air pressure sensor, and the ultrasonic disperser includes: a vacuum degassing machine, a density meter, a thermometer, a viscometer, a turbidity meter and an ultrasonic homogenizer; The conductive agent raw material set is subjected to segmented ball milling treatment using a ball mill to obtain a mixed conductive raw material, the mixed conductive raw material and the auxiliary raw material set are subjected to ultrasonic mixing treatment using an ultrasonic disperser to obtain a composite electrode slurry, and the composite electrode slurry is subjected to electrostatic spinning using an electrostatic spinning machine to obtain a composite fiber membrane set; A composite fiber membrane is extracted from the composite fiber membrane set, the composite fiber membrane set of the extracted composite fiber membrane is used as the updated fiber membrane set, and the following operations are performed on the extracted composite fiber membrane: A composite fiber membrane is subjected to high-temperature sintering operation using a tubular furnace and a preset initial temperature to obtain a composite carbonized material, and the composite carbonized material is subjected to calendering treatment using a preset initial pressure and a calender to obtain a standard electrode material; Extracting a standard electrode sample from the standard electrode material, performing pore conductivity analysis on the standard electrode sample to obtain a comprehensive conductivity index, and comparing the comprehensive conductivity index with a preset conductivity threshold; If the comprehensive conductivity index is greater than or equal to the conductivity threshold, the standard electrode material after the standard electrode sample is extracted is used as the target electrode material, the updated fiber membrane set is used as the composite fiber membrane set, and the step of extracting the composite fiber membrane from the composite fiber membrane set is returned until there is no composite fiber membrane in the composite fiber membrane set; If the comprehensive conductivity index is less than the conductivity threshold, the updated temperature and the updated pressure are calculated using the initial temperature and the initial pressure, the updated temperature is used as the initial temperature, the updated pressure is used as the initial pressure, the updated fiber membrane set is used as the composite fiber membrane set, and the process returns to the step of extracting the composite fiber membrane from the composite fiber membrane set until no composite fiber membrane exists in the composite fiber membrane set; The target electrode materials are summarized to obtain a target electrode material set, thus completing the preparation of the needle-type lithium battery electrode materials.

2. The method for preparing a needle-type lithium battery electrode material based on graphene doping according to claim 1, characterized in that: The method of using a ball mill to perform segmented ball milling on the conductive agent raw material set to obtain a mixed conductive raw material includes: Obtaining primary graphene, primary artificial graphite and primary conductive carbon black based on a ball mill and a conductive agent raw material set; Placing primary graphene into a ball mill of a ball mill to obtain a primary ball mill, starting a vacuum pump, performing a vacuum operation on the primary ball mill using the started vacuum pump, and using a pressure sensor to monitor the air pressure in the update tank of the primary ball mill that performs the vacuum operation in real time until the air pressure in the update tank is less than or equal to a preset first pressure threshold, and then turning off the vacuum pump to obtain an updated ball mill; Using a pre-built high-purity argon gas bottle to fill the updated ball mill with argon gas, and using a pressure sensor to monitor the target tank internal pressure of the updated ball mill filled with argon gas in real time until the target tank internal pressure is greater than or equal to a preset second pressure threshold, thereby obtaining a target primary ball mill; Using a ball mill to perform a ball milling operation on the primary graphene in the target primary ball milling jar to obtain a primary ball milling raw material, wherein the speed and time of the ball mill to perform the ball milling operation on the primary graphene in the target primary ball milling jar are respectively a preset first ball milling speed and a preset first ball milling time; Putting primary artificial graphite and primary ball-milling raw materials into the ball mill of the ball mill to obtain an intermediate ball mill, and obtaining a target intermediate ball mill based on a vacuum pump, a pressure sensor, a high-purity argon gas bottle and the intermediate ball mill; Using a ball mill to perform a ball milling operation on the primary artificial graphite and the primary ball milling raw material in the target intermediate ball milling jar to obtain an intermediate ball milling raw material, wherein the speed and time of the ball mill to perform the ball milling operation on the primary artificial graphite and the primary ball milling raw material in the target intermediate ball milling jar are respectively a second ball milling speed and a second ball milling time, and the second ball milling speed is twice the first ball milling speed, and the second ball milling time is half of the first ball milling time; Put the primary conductive carbon black and the intermediate ball milling raw materials into the ball milling jar of the ball mill to obtain the advanced ball milling jar, and obtain the target advanced ball milling jar based on the vacuum pump, the air pressure sensor, the high-purity argon gas bottle and the advanced ball milling jar; A ball mill is used to perform ball milling operation on the primary conductive carbon black and intermediate ball milling raw materials in the target high-grade ball milling jar to obtain a mixed conductive raw material, wherein the rotation speed and time of the ball mill performing the ball milling operation on the primary conductive carbon black and intermediate ball milling raw materials in the target high-grade ball milling jar are respectively the third ball milling rotation speed and the third ball milling time, and the third ball milling rotation speed is twice the second ball milling rotation speed, and the third ball milling time is half of the second ball milling time.

3. The method for preparing a needle-type lithium battery electrode material based on graphene doping according to claim 2, characterized in that: The method of obtaining primary graphene, primary artificial graphite and primary conductive carbon black based on a ball mill and a conductive agent raw material set comprises: Confirm the grinding ball mass of the grinding ball in the ball mill, and calculate the graphene mass based on the grinding ball mass. The calculation formula is as follows: Among them, m Gs is the mass of graphene, m X is the mass of the grinding ball, k x It is the preset ball-to-material ratio; The mass of artificial graphite is calculated according to the mass of graphene and the preset first raw material ratio. The calculation formula is as follows: Among them, m Gra is the mass of artificial graphite, k1 is the first raw material ratio; Obtaining the mass of conductive carbon black based on the mass of graphene and a preset second raw material ratio; Primary graphene is extracted from the graphene raw material of the conductive agent raw material set based on the mass of graphene, primary artificial graphite is extracted from the artificial graphite raw material of the conductive agent raw material set based on the mass of artificial graphite, and primary conductive carbon black is extracted from the conductive carbon black raw material of the conductive agent raw material set based on the mass of conductive carbon black, wherein the masses of primary graphene, primary artificial graphite and primary conductive carbon black are the mass of graphene, the mass of artificial graphite and the mass of conductive carbon black, respectively.

4. The method for preparing a needle-type lithium battery electrode material based on graphene doping according to claim 3, characterized in that: The method of using an ultrasonic disperser to perform ultrasonic mixing treatment on the mixed conductive raw material and the auxiliary raw material set to obtain a composite electrode slurry includes: Weighing the mixed conductive raw material to obtain the mass of the mixed raw material; Obtaining the mass of the active material based on the mass of the mixed raw material and a preset third raw material ratio, and obtaining the mass of the binder based on the mass of the mixed raw material and a preset fourth raw material ratio; Extracting primary active materials from the active materials in the auxiliary raw material set based on the mass of the active materials, and extracting primary binders from the binders in the auxiliary raw material set based on the mass of the binders, wherein the masses of the primary active materials and the primary binders are the mass of the active materials and the mass of the binders, respectively; Performing a liquid mixing operation on the mixed conductive raw material, the primary active material and the primary binder to obtain an original slurry, and placing the original slurry in an ultrasonic homogenizer to obtain a primary slurry; Inputting a preset initial ultrasonic frequency and a preset initial power into an ultrasonic homogenizer to obtain a target homogenizer; Starting the target homogenizer, taking the time of starting the target homogenizer as the starting point and recording the time in real time to obtain the ultrasonic time, and using the target homogenizer to perform a homogenizing and mixing operation on the primary slurry, when the ultrasonic time reaches a preset homogenizing time threshold, closing the target homogenizer to obtain the primary electrode slurry; Extracting a primary slurry sample from the primary electrode slurry, and performing detection operations on the primary slurry sample using a densitometer, a thermometer, a viscometer, and a turbidity meter, respectively, to obtain slurry density, slurry temperature, slurry dynamic viscosity, and slurry turbidity; Calculate the slurry uniformity index according to the slurry density, slurry temperature, slurry dynamic viscosity and slurry turbidity, and compare the slurry uniformity index with the preset slurry uniformity threshold; If the slurry uniformity index is greater than or equal to a preset slurry uniformity threshold, a vacuum degassing machine is used to perform a vacuum degassing operation on the primary electrode slurry to obtain a composite electrode slurry; If the slurry uniformity index is less than the slurry uniformity threshold, the corrected ultrasonic frequency and the corrected power are calculated according to the slurry density, slurry temperature, slurry dynamic viscosity, slurry turbidity, initial ultrasonic frequency and initial power, and the corrected ultrasonic frequency is used as the initial ultrasonic frequency, the corrected power is used as the initial power, and the primary electrode slurry is used as the primary slurry. The process returns to the step of inputting the preset initial ultrasonic frequency and the preset initial power into the ultrasonic homogenizer until the slurry uniformity index is greater than or equal to the slurry uniformity threshold.

5. The method for preparing a needle-type lithium battery electrode material based on graphene doping according to claim 4, characterized in that: The calculation formula of the slurry uniformity index is as follows: Among them, φ H is the slurry uniformity index, T H is the slurry temperature, T0 is the preset initial temperature, σ TU is the turbidity of slurry, μ dv is the slurry dynamic viscosity, ρ H is the slurry density, tanh is the hyperbolic tangent function, and e is a natural constant.

6. The method for preparing a needle-type lithium battery electrode material based on graphene doping according to claim 5, characterized in that: The method of calculating the corrected ultrasonic frequency and the corrected power according to the slurry density, slurry temperature, slurry dynamic viscosity, slurry turbidity, initial ultrasonic frequency and initial power comprises: The corrected ultrasonic frequency is calculated based on the slurry turbidity, slurry dynamic viscosity, slurry density and initial ultrasonic frequency. The calculation formula is as follows: Among them, v sou is the corrected ultrasonic frequency, v0 is the initial ultrasonic frequency; The corrected power is calculated based on the slurry temperature and initial power. The calculation formula is as follows: Among them, p sou is the corrected power, p0 is the initial power, T c is the preset reference temperature.

7. The method for preparing a needle-type lithium battery electrode material based on graphene doping according to claim 6, characterized in that: The method comprises: performing a high-temperature sintering operation on the composite fiber membrane using a tubular furnace at a preset initial temperature to obtain a composite carbonized material, comprising: Determining a relay temperature based on the initial temperature, wherein the relay temperature is half of the initial temperature; The composite fiber membrane is placed in a tubular furnace to obtain an initial tubular furnace, and a high-purity argon gas bottle is used to fill the initial tubular furnace with argon gas to obtain a target tubular furnace; Starting the target tubular furnace, and using the started target tubular furnace to burn the composite fiber membrane, wherein the temperature at which the target tubular furnace burns the composite fiber membrane is the relay temperature, starting the time of starting the target tubular furnace as the starting point and recording the time in real time to obtain a first sintering time, until the first sintering time reaches a preset first time threshold, closing the target tubular furnace to obtain an initial carbonized material; The target tube furnace is started, and the initial carbonized material is burned by using the started target tube furnace, wherein the temperature at which the target tube furnace burns the initial carbonized material is the initial temperature, and the time of starting the target tube furnace is taken as the starting point and the time is recorded in real time to obtain a second sintering time, until the second sintering time reaches a preset second time threshold, the target tube furnace is closed, and a composite carbonized material is obtained, wherein the second time threshold is half of the first time threshold.

8. The method for preparing a needle-type lithium battery electrode material based on graphene doping according to claim 7, characterized in that: The pore conductivity analysis is performed on the standard electrode sample to obtain a comprehensive conductivity index, including: Weighing the standard electrode sample to obtain the mass of the standard sample; Performing a mercury intrusion test on a standard electrode sample using a pre-built mercury intrusion instrument to obtain a mercury liquid filling volume, wherein a test pressure for the mercury intrusion instrument to perform the mercury intrusion test on the standard electrode sample is preset; The sample void index is calculated based on the mercury liquid filling volume, standard sample mass and test pressure. The calculation formula is as follows: Among them, ε v is the sample void index, V Hg is the mercury liquid filling volume, ρ Hg is the preset density of mercury, m b is the standard sample mass, P x is the test pressure, ln is the natural logarithm; The comprehensive conductivity index is calculated based on the sample void index. The calculation formula is as follows: Among them, I xc is the comprehensive conductivity index, ε0 is the preset reference pore index, m I , m1 and m2 are the mass of mixed raw materials, active materials and binder respectively.

9. The method for preparing a needle-type lithium battery electrode material based on graphene doping according to claim 8, characterized in that: The method of calculating the updated temperature and the updated pressure using the initial temperature and the initial pressure includes: The updated temperature is calculated based on the sample void index, reference void index and initial temperature. The calculation formula is as follows: Among them, T y is the update temperature, T x is the initial temperature; An updated pressure is calculated based on the sample void index, the reference void index, and the initial pressure.

10. A system for preparing needle-type lithium battery electrode materials based on graphene doping, characterized in that: The system comprises: Preparation material preparation module, used to obtain conductive agent raw material set and auxiliary raw material set, wherein the conductive agent raw material set includes: graphene raw material, artificial graphite raw material and conductive carbon black raw material, the auxiliary raw material set includes: active material and binder, confirm electrode preparation mechanism, wherein the electrode preparation mechanism includes: ball mill, ultrasonic disperser, electrospinning machine, tubular furnace and calender, wherein the ball mill includes: ball mill, grinding ball, vacuum pump and air pressure sensor, ultrasonic disperser includes: vacuum degassing machine, density meter, thermometer, viscometer, turbidity meter and ultrasonic homogenizer; The conductive raw material mixing module is used to perform segmented ball milling treatment on the conductive agent raw material set by a ball mill to obtain a mixed conductive raw material, perform ultrasonic mixing treatment on the mixed conductive raw material and the auxiliary raw material set by an ultrasonic disperser to obtain a composite electrode slurry, and perform electrostatic spinning on the composite electrode slurry by an electrostatic spinning machine to obtain a composite fiber membrane set; The composite material processing module is used to extract the composite fiber membrane from the composite fiber membrane set, use the composite fiber membrane set of the extracted composite fiber membrane as the updated fiber membrane set, and perform the following operations on the extracted composite fiber membrane: perform high-temperature sintering operation on the composite fiber membrane using a tubular furnace and a preset initial temperature to obtain a composite carbonized material, and perform calendering treatment on the composite carbonized material using a preset initial pressure and a calender to obtain a standard electrode material; The conductive performance evaluation module is used to extract a standard electrode sample from the standard electrode material, perform pore conductivity analysis on the standard electrode sample to obtain a comprehensive conductivity index, compare the comprehensive conductivity index with a preset conductivity threshold, and if the comprehensive conductivity index is greater than or equal to the conductivity threshold, the standard electrode material after the standard electrode sample is extracted is used as the target electrode material, the updated fiber membrane set is used as the composite fiber membrane set, and the step of extracting the composite fiber membrane from the composite fiber membrane set is returned until no composite fiber membrane exists in the composite fiber membrane set. If the comprehensive conductivity index is less than the conductivity threshold, the update temperature and update pressure are calculated using the initial temperature and initial pressure, the update temperature is used as the initial temperature, the update pressure is used as the initial pressure, the updated fiber membrane set is used as the composite fiber membrane set, and the step of extracting the composite fiber membrane from the composite fiber membrane set is returned until no composite fiber membrane exists in the composite fiber membrane set, the target electrode material is summarized, the target electrode material set is obtained, and the preparation of the needle-type lithium battery electrode material is completed.

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