A method and system for preparing needle-type lithium battery electrode materials based on graphene doping

Abstract

This invention relates to the field of battery material preparation, and discloses a method and system for preparing needle-type lithium battery electrode materials based on graphene doping. The method includes: acquiring a set of conductive agent raw materials and an auxiliary raw material set; confirming the electrode preparation mechanism; performing segmented ball milling on the conductive agent raw material set to obtain a mixed conductive raw material; performing ultrasonic mixing on the mixed conductive raw material set and the auxiliary raw material set to obtain a composite electrode slurry; performing electrospinning on the composite electrode slurry to obtain a composite fiber membrane set; performing high-temperature sintering on the composite fiber membrane to obtain a composite carbonized material; performing calendering on the composite carbonized material using a preset initial pressure and a calender to obtain a standard electrode material; performing pore conductivity analysis on the standard electrode sample to obtain a comprehensive conductivity index; summarizing the target electrode materials; and completing the preparation of the needle-type lithium battery electrode material. This invention can improve the automation level of the electrode material preparation process, and improve the conductivity and product quality of the electrode material.

Description

Technical Field

[0001] This invention relates to the field of battery material preparation, and in particular to a method, system, electronic device, and computer-readable storage medium for preparing graphene-doped needle-type lithium battery electrode materials. Background Technology

[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. Electrode materials, as a core component of lithium-ion batteries, directly affect the overall performance of the battery due to their conductivity, structural stability, and manufacturing process.

[0003] Currently, traditional lithium battery electrode materials mostly use a single conductive agent (such as conductive carbon black or graphite) combined with active materials. Graphene has excellent electrical and mechanical 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 their performance, the doping process still faces some bottlenecks, such as uneven mixing of raw materials and difficulty in controlling process parameters. Therefore, there is an urgent need to develop a highly automated and precisely controllable method for preparing needle-type lithium battery electrode materials to solve the problems existing in the current doping process. Summary of the Invention

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

[0006] To achieve the above objectives, the present invention provides a method for preparing a needle-type lithium battery electrode material based on graphene doping, comprising:

[0007] Obtain a set of conductive agent raw materials and a set of auxiliary raw materials. The set of conductive agent raw materials includes: graphene raw materials, artificial graphite raw materials and conductive carbon black raw materials. The set of auxiliary raw materials includes: active materials and binders.

[0008] The electrode preparation mechanism is identified, which includes: a ball mill, an ultrasonic disperser, an electrospinning machine, a tube furnace, and a calender. The ball mill includes: a grinding jar, grinding balls, a vacuum pump, and a pressure sensor. The ultrasonic disperser includes: a vacuum degasser, 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 to obtain mixed conductive raw material. The mixed conductive raw material set and auxiliary raw material set are subjected to ultrasonic mixing treatment using an ultrasonic disperser to obtain composite electrode slurry. The composite electrode slurry is electrospun using an electrospinning machine to obtain composite fiber membrane set.

[0010] Composite fiber membranes are extracted from the composite fiber membrane set. The composite fiber membrane set from which the composite fiber membranes have been extracted is used as the new fiber membrane set, and the following operations are performed on the extracted composite fiber membranes:

[0011] High-temperature sintering of the composite fiber membrane is performed using a tube furnace and a preset initial temperature to obtain a composite carbonized material. The composite carbonized material is then calendered using a preset initial pressure and a calender to obtain a standard electrode material.

[0012] Standard electrode samples are extracted from standard electrode materials, and pore conductivity analysis is performed on the standard electrode samples to obtain a comprehensive conductivity index. The comprehensive conductivity index is then 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 overall 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, and the updated fiber membrane set is used as the composite fiber membrane set. The process of extracting the composite fiber membrane from the composite fiber membrane set is repeated until there is no composite fiber membrane in the composite fiber membrane set.

[0015] By summarizing the target electrode materials, a set of target electrode materials is obtained, thus completing the preparation of electrode materials for needle-type lithium batteries.

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

[0017] Primary graphene, primary artificial graphite, and primary conductive carbon black are obtained using ball mills and conductive agent raw material sets.

[0018] Primary graphene is placed into the ball mill jar of a ball mill to obtain a primary ball mill jar. The vacuum pump is started to perform a vacuuming operation on the primary ball mill jar. The pressure sensor is used to monitor the pressure inside the replacement jar of the primary ball mill jar in real time until the pressure inside the replacement jar is less than or equal to a preset first pressure threshold. Then the vacuum pump is turned off to obtain a replacement ball mill jar.

[0019] Argon gas is used to fill the new ball mill jar with a pre-constructed high-purity argon gas cylinder, and the gas pressure inside the target jar is monitored in real time by a gas pressure sensor until the gas pressure inside the target jar is greater than or equal to a preset second gas pressure threshold, thus obtaining the target primary ball mill jar.

[0020] A ball mill is used to perform a ball milling operation on the primary graphene in the target primary ball milling jar to obtain primary ball milling raw material. The rotation speed and time of the ball mill performing 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.

[0021] Primary artificial graphite and primary ball milling raw materials are placed into the ball mill jar of a ball mill to obtain an intermediate ball mill jar. The target intermediate ball mill jar is obtained based on a vacuum pump, a pressure sensor, a high-purity argon cylinder, and the intermediate ball mill jar.

[0022] A ball mill is used to perform a ball milling operation on the primary artificial graphite and the primary ball milling material in the target intermediate ball milling jar to obtain intermediate ball milling material. The rotational speed and time of the ball mill performing the ball milling operation on the primary artificial graphite and the primary ball milling material in the target intermediate ball milling jar are the second ball milling speed and the second ball milling time, respectively. The second ball milling speed is twice the first ball milling speed, and the second ball milling time is half the first ball milling time.

[0023] Primary conductive carbon black and intermediate ball milling raw materials are placed into the ball mill jar of a ball mill to obtain an advanced ball mill jar. The target advanced ball mill jar is obtained based on a vacuum pump, a pressure sensor, a high-purity argon cylinder, and the advanced ball mill jar.

[0024] A ball mill is used to perform ball milling operations on the primary conductive carbon black and the intermediate ball milling raw material in the target advanced ball milling jar to obtain a mixed conductive raw material. The rotational speed and time of the ball mill for performing the ball milling operation on the primary conductive carbon black and the intermediate ball milling raw material in the target advanced ball milling jar are respectively the third ball milling speed and the third ball milling time, and the third ball milling speed is twice the second ball milling speed, and the third ball milling time is half the second ball milling time.

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

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

[0027]

[0028] Where, m Gs For the mass of graphene, m X For the mass of the grinding ball, k x The preset ball-to-material ratio;

[0029] The mass of artificial graphite is calculated based on the mass of graphene and the preset first raw material ratio, using the following formula:

[0030]

[0031] Where, m Gra The mass of the artificial graphite is given by k1, where k1 is the first raw material ratio.

[0032] The mass of conductive carbon black is obtained based on the mass of graphene and the preset ratio of the second raw material.

[0033] Primary graphene is extracted from the graphene raw material in the conductive agent raw material set based on the quality of graphene; primary artificial graphite is extracted from the artificial graphite raw material in the conductive agent raw material set based on the quality of artificial graphite; and primary conductive carbon black is extracted from the conductive carbon black raw material in the conductive agent raw material set based on the quality of conductive carbon black. 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 mixing treatment of the mixed conductive raw material and auxiliary raw material set using an ultrasonic disperser to obtain the composite electrode slurry includes:

[0035] The mixed conductive materials are weighed to obtain the mass of the mixed materials.

[0036] The mass of the active material is obtained based on the mass of the mixed raw materials and the preset third raw material ratio, and the mass of the binder is obtained based on the mass of the mixed raw materials and the preset fourth raw material ratio.

[0037] Primary active materials are extracted from the active materials in the auxiliary raw material set based on the quality of the active materials, and primary binders are extracted from the binders in the auxiliary raw material set based on the quality of the binders, wherein the quality of the primary active materials and the quality of the primary binders are the quality of the active materials and the quality of the binders, respectively.

[0038] A liquid mixing operation is performed on the mixed conductive raw material, primary active material and primary binder to obtain the original slurry. The original slurry is then placed in an ultrasonic homogenizer to obtain the primary slurry.

[0039] The preset initial ultrasonic frequency and preset initial power are input into the ultrasonic homogenizer to obtain the target homogenizer.

[0040] Start the target homogenizer, record the time in real time from the start time of the target homogenizer to obtain the ultrasonic time, and use the target homogenizer to perform homogenization and 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.

[0041] Primary slurry samples were extracted from the primary electrode slurry. The primary slurry samples were tested using a densitometer, thermometer, viscometer, and turbidity meter to obtain the slurry density, slurry temperature, slurry dynamic viscosity, and slurry turbidity.

[0042] The slurry uniformity index is calculated based on slurry density, slurry temperature, slurry dynamic viscosity and slurry turbidity, and the slurry uniformity index is compared with the preset slurry uniformity threshold.

[0043] If the slurry uniformity index is greater than or equal to the preset slurry uniformity threshold, then a vacuum degassing operation is performed 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, then the corrected ultrasonic frequency and corrected power are calculated based on the slurry density, slurry temperature, slurry dynamic viscosity, slurry turbidity, initial ultrasonic frequency and initial power. 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 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 formula for calculating the slurry uniformity index is as follows:

[0046]

[0047] Where, φ H T is the slurry uniformity index. H T0 is the slurry temperature, T0 is the preset initial temperature, and σ is the slurry temperature. TU Turbidity of the slurry, μ dv ρ is the dynamic viscosity of the slurry. H Let be the slurry density, tanh be the hyperbolic tangent function, and e be the natural constant.

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

[0049] The corrected ultrasonic frequency is calculated based on the turbidity, dynamic viscosity, density, and initial ultrasonic frequency of the slurry. The calculation formula is shown below:

[0050]

[0051] Among them, v sou To correct the ultrasonic frequency, v0 is the initial ultrasonic frequency;

[0052] The corrected power is calculated based on the slurry temperature and initial power, using the following formula:

[0053]

[0054] Where, p sou To correct the power, p0 is the initial power, T c This is the preset reference temperature.

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

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

[0057] The composite fiber membrane is placed into a tube furnace to obtain the initial tube furnace. The initial tube furnace is then filled with argon gas using a high-purity argon gas cylinder to obtain the target tube furnace.

[0058] The target tube furnace is started, and the composite fiber membrane is sintered using the started target tube furnace. The temperature at which the composite fiber membrane is sintered by the target tube furnace is the relay temperature. The time of starting the target tube furnace is taken as the starting point and the time is recorded in real time to obtain the first sintering time. The target tube furnace is shut down when the first sintering time reaches the preset first time threshold to obtain the initial carbonized material.

[0059] The target tube furnace is started, and the initial carbonized material is calcined using the started target tube furnace. The calcination temperature of the initial carbonized material by the target tube furnace is the initial temperature. The second sintering time is obtained by starting the target tube furnace and recording the time in real time. The target tube furnace is shut down when the second sintering time reaches the preset second time threshold, and the composite carbonized material is obtained. The second time threshold is half of the first time threshold.

[0060] Optionally, the pore conductivity analysis performed on the standard electrode sample to obtain the comprehensive conductivity index includes:

[0061] The standard electrode sample was weighed to obtain the mass of the standard sample.

[0062] A pre-built mercury porosimeter was used to perform mercury porosimeter tests on a standard electrode sample to obtain the mercury liquid filling volume. The test pressure of the mercury porosimeter for performing mercury porosimeter tests on the standard electrode sample was preset.

[0063] The porosity index of the sample is calculated based on the mercury filling volume, the mass of the standard sample, and the test pressure, using the following formula:

[0064]

[0065] Where, ε v V is the sample porosity index. Hgρ is the volume of the mercury solution. Hg Given the preset density of mercury, m b For standard sample quality, P x For testing stress, ln is the natural logarithm;

[0066] The comprehensive conductivity index is calculated based on the sample porosity index, and the calculation formula is as follows:

[0067]

[0068] Among them, I xc The comprehensive electrical conductivity index is given by ε0, which is a preset reference porosity index, and m is given by m. I m1 and m2 represent the mass of the mixed raw materials, the mass of the active materials, and the mass of the binder, respectively.

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

[0070] The updated temperature is calculated based on the sample porosity index, the reference porosity index, and the initial temperature, using the following formula:

[0071]

[0072] Among them, T y To update the temperature, T x The initial temperature;

[0073] The updated pressure is calculated based on the sample porosity index, the reference porosity index, and the initial pressure.

[0074] To achieve the above objectives, the present invention also provides a system for preparing needle-type lithium battery electrode materials based on graphene doping, comprising:

[0075] The material preparation module is used to obtain the conductive agent raw material set and the 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 materials and binders. The module also confirms the electrode preparation mechanism, which includes: ball mill, ultrasonic disperser, electrospinning machine, tube furnace and calender. The ball mill includes: ball milling jar, grinding balls, vacuum pump and pressure sensor. The ultrasonic disperser includes: vacuum degasser, densitometer, thermometer, viscometer, turbidimeter and ultrasonic homogenizer.

[0076] The conductive raw material mixing module is used to perform segmented ball milling of the conductive agent raw material set to obtain mixed conductive raw material. The mixed conductive raw material set and the auxiliary raw material set are ultrasonically mixed using an ultrasonic disperser to obtain composite electrode slurry. The composite electrode slurry is electrospun using an electrospinning machine to obtain composite fiber membrane set.

[0077] The composite material processing module is used to extract composite fiber membranes from the composite fiber membrane set, use the extracted composite fiber membrane set as the new fiber membrane set, and perform the following operations on the extracted composite fiber membranes: perform high-temperature sintering operation on the composite fiber membranes using a tube furnace and a preset initial temperature to obtain composite carbonized materials, and perform calendering treatment on the composite carbonized materials using a preset initial pressure and a calender to obtain standard electrode materials.

[0078] The conductivity performance evaluation module is used to extract standard electrode samples from standard electrode materials, perform pore conductivity analysis on the standard electrode samples 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, then the standard electrode material after extracting the standard electrode samples is used as the target electrode material, and the updated fiber membrane set is used as the composite fiber membrane set. The process returns to the step of extracting the composite fiber membrane from the composite fiber membrane set until no composite fiber membrane is found in the composite fiber membrane set. If the comprehensive conductivity index is less than the conductivity threshold, then 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 process returns to the step of extracting the composite fiber membrane from the composite fiber membrane set until no composite fiber membrane is found in the composite fiber membrane set. Finally, the target electrode materials are summarized to obtain the target electrode material set, completing the preparation of the needle-type lithium battery electrode material.

[0079] To address the above problems, the present invention also provides an electronic device, the electronic device comprising:

[0080] Memory, storing at least one instruction; and

[0081] The processor executes the instructions stored in the memory to implement the above-described method for preparing needle-type lithium battery electrode materials based on graphene doping.

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

[0083] To address the problems described in the background art, this invention provides a set of conductive agent raw materials and an auxiliary raw material set. The conductive agent raw material set includes graphene raw materials, artificial graphite raw materials, and conductive carbon black raw materials. The auxiliary raw material set includes active materials and binders. Therefore, by obtaining the conductive agent raw material set and the auxiliary raw material set, this invention provides a raw material basis for the subsequent preparation of composite electrode slurry, thereby confirming the 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 grinding jar, grinding balls, a vacuum pump, and a pressure sensor. The ultrasonic disperser includes a vacuum degasser, a densitometer, a thermometer, a viscometer, a turbidimeter, and an ultrasonic homogenizer. Therefore, this invention provides a set of conductive agent raw materials and an auxiliary raw material set, thereby providing a raw material basis for the subsequent preparation of composite electrode slurry. The electrode preparation mechanism includes a ball mill, an ultrasonic disperser, an ultrasonic degasser, a densitometer, a thermometer, a viscometer, a turbidimeter, and an ultrasonic homogenizer. The electrode preparation mechanism was confirmed to provide the necessary equipment and a complete preparation environment for the electrode material preparation process. The conductive agent raw material set was subjected to segmented ball milling to obtain a mixed conductive raw material. The mixed conductive raw material and auxiliary raw material set were then ultrasonically mixed using an ultrasonic disperser to obtain a composite electrode slurry. The composite electrode slurry was then electrospun using an electrospinning machine to obtain a composite fiber membrane set. It can be seen that the embodiments of the present invention utilize a ball mill and ultrasonic disperser to sufficiently mix the conductive agent raw material set and auxiliary raw material set, and then use electrospinning to form a composite fiber membrane with higher conductivity from the composite electrode slurry, thereby improving the conductivity and product quality of the electrode material. The composite fiber membrane was extracted from the composite fiber membrane set, and the extracted composite fiber membrane was then... The composite fiber membrane set is used as a replacement fiber membrane set, and the following operations are performed on the extracted composite fiber membrane: High-temperature sintering of the composite fiber membrane is performed using a tube furnace at a preset initial temperature to obtain a composite carbonized material; the composite carbonized material is then calendered using a preset initial pressure and a 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 process of the calender. A 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 then... As the target electrode material, the updated fiber membrane set is used as the composite fiber membrane set. The process returns to the step of extracting the composite fiber membrane from the composite fiber membrane set until no composite fiber membrane remains 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, and the update pressure is used as the initial pressure. The updated fiber membrane set is then 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 remains in the composite fiber membrane set. The target electrode materials are then summarized to obtain the target electrode material set, completing 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 comprehensive conductivity index.This invention improves the automation level of the electrode material preparation process and optimizes the process parameters of the high-temperature sintering process in the tube furnace and the calendering process in the rolling mill by utilizing the comprehensive conductivity index to control the initial temperature and pressure, thereby further improving the product quality of the electrode material. Therefore, this invention can improve the automation level of the electrode material preparation process, enhance the conductivity of the electrode material, and improve product quality. Attached Figure Description

[0084] Figure 1 This is a schematic flowchart of a method for preparing a graphene-doped needle-type lithium battery electrode material according to an embodiment of the present invention.

[0085] Figure 2 This is a functional block diagram of a graphene-doped needle-type lithium battery electrode material preparation system provided in an embodiment of the present invention.

[0086] Figure 3 This is a schematic diagram of the structure of an electronic device that implements the method for preparing needle-type lithium battery electrode materials based on graphene doping, according to an embodiment of the present invention.

[0087] Explanation of reference numerals in the attached figures:

[0088] 10. Electronic device; 11. Processor; 12. Memory; 13. Bus.

[0089] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0090] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0091] This application provides a method for preparing a graphene-doped needle-type lithium battery electrode material. The execution entity of this method includes, but is not limited to, at least one electronic device configured to execute the method provided in this application, such as a server or a terminal. In other words, the method can be executed by software or hardware installed on a terminal device or server device, and the software may 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.

[0092] Reference Figure 1 The diagram shown is a schematic flowchart of a method for preparing a graphene-doped needle-type lithium battery electrode material according to an embodiment of the present invention. In this embodiment, the method for preparing the graphene-doped needle-type lithium battery electrode material includes:

[0093] S1. Obtain the set of conductive agent raw materials and the set of auxiliary raw materials. The set of conductive agent raw materials includes: graphene raw materials, artificial graphite raw materials and conductive carbon black raw materials. The set of auxiliary raw materials includes: active materials and binders.

[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. Graphene raw material refers to a certain mass of graphene. Artificial graphite raw material refers to a certain mass of artificial graphite. Conductive carbon black raw material refers to a certain mass of carbon black with low or high resistance properties. Active material refers to a certain mass of manganese dioxide. Binder refers to a certain mass of polyvinylidene fluoride.

[0095] S2. Confirm the electrode preparation mechanism, which includes: ball mill, ultrasonic disperser, electrospinning machine, tube furnace and calender. The ball mill includes: ball milling jar, grinding balls, vacuum pump and pressure sensor. The ultrasonic disperser includes: vacuum degasser, densitometer, thermometer, viscometer, turbidimeter and ultrasonic homogenizer.

[0096] It should be explained that the electrode preparation mechanism is a device integrating a ball mill, ultrasonic disperser, electrospinning machine, tube furnace, and calender. Optionally, a Miki vertical planetary ball mill is used as the ball mill. The grinding jar is a container in the ball mill used to hold 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 made of zirconia and are used to grind various materials in the ball mill. The main function of the vacuum pump is to extract the gas inside the grinding jar, creating a near-vacuum or low-pressure environment. The main function of the pressure sensor is to monitor the gas pressure inside the grinding jar in real time. The ultrasonic disperser is a device integrating a vacuum degasser, densitometer, thermometer, viscometer, turbidimeter, and ultrasonic homogenizer, used to perform ultrasonic mixing treatment on the mixed conductive raw materials and auxiliary raw materials. The main function of the vacuum degasser is to remove air bubbles from the primary electrode slurry. Optionally, a micro-naphthalene mixing degasser is used as the vacuum degasser. A densitometer is an instrument used to detect the density of a primary slurry sample. A thermometer is an instrument used to detect the temperature of a primary slurry sample. A viscometer is an instrument used to detect the dynamic viscosity of a primary slurry sample. A turbidimeter is an instrument used to detect the turbidity of a primary slurry sample. An ultrasonic homogenizer is an instrument that uses ultrasound to disperse and mix primary slurries. Optionally, a Hangzhou Jinghao Machinery ultrasonic solution homogenizer can be used as the ultrasonic homogenizer. An electrospinning machine is a device based on electrospinning technology to form composite fiber membranes from composite electrode slurries. Optionally, a Huizhi Electric Workshop HZ-02 electrospinning machine can be used as the electrospinning machine, a Tianjin Bona hot vacuum atmosphere tube furnace can be used as the tube furnace, and a Jinhaochuan graphite calender can be used as the calender.

[0097] S3. The conductive agent raw material set is subjected to segmented ball milling to obtain mixed conductive raw material. The mixed conductive raw material set and auxiliary raw material set are subjected to ultrasonic mixing treatment using an ultrasonic disperser to obtain composite electrode slurry. The composite electrode slurry is electrospun using an electrospinning machine to obtain composite fiber membrane set.

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

[0099] It should be understood that the electrospinning technology is existing technology and will not be described in detail here.

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

[0101] Primary graphene, primary artificial graphite, and primary conductive carbon black are obtained using ball mills and conductive agent raw material sets.

[0102] Primary graphene is placed into the ball mill jar of a ball mill to obtain a primary ball mill jar. The vacuum pump is started to perform a vacuuming operation on the primary ball mill jar. The pressure sensor is used to monitor the pressure inside the replacement jar of the primary ball mill jar in real time until the pressure inside the replacement jar is less than or equal to a preset first pressure threshold. Then the vacuum pump is turned off to obtain a replacement ball mill jar.

[0103] Argon gas is used to fill the new ball mill jar with a pre-constructed high-purity argon gas cylinder, and the gas pressure inside the target jar is monitored in real time by a gas pressure sensor until the gas pressure inside the target jar is greater than or equal to a preset second gas pressure threshold, thus obtaining the target primary ball mill jar.

[0104] A ball mill is used to perform a ball milling operation on the primary graphene in the target primary ball milling jar to obtain primary ball milling raw material. The rotation speed and time of the ball mill performing 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.

[0105] Primary artificial graphite and primary ball milling raw materials are placed into the ball mill jar of a ball mill to obtain an intermediate ball mill jar. The target intermediate ball mill jar is obtained based on a vacuum pump, a pressure sensor, a high-purity argon cylinder, and the intermediate ball mill jar.

[0106] A ball mill is used to perform a ball milling operation on the primary artificial graphite and the primary ball milling material in the target intermediate ball milling jar to obtain intermediate ball milling material. The rotational speed and time of the ball mill performing the ball milling operation on the primary artificial graphite and the primary ball milling material in the target intermediate ball milling jar are the second ball milling speed and the second ball milling time, respectively. The second ball milling speed is twice the first ball milling speed, and the second ball milling time is half the first ball milling time.

[0107] Primary conductive carbon black and intermediate ball milling raw materials are placed into the ball mill jar of a ball mill to obtain an advanced ball mill jar. The target advanced ball mill jar is obtained based on a vacuum pump, a pressure sensor, a high-purity argon cylinder, and the advanced ball mill jar.

[0108] A ball mill is used to perform ball milling operations on the primary conductive carbon black and the intermediate ball milling raw material in the target advanced ball milling jar to obtain a mixed conductive raw material. The rotational speed and time of the ball mill for performing the ball milling operation on the primary conductive carbon black and the intermediate ball milling raw material in the target advanced ball milling jar are respectively the third ball milling speed and the third ball milling time, and the third ball milling speed is twice the second ball milling speed, and the third ball milling time is half the second ball milling time.

[0109] It should be explained that the primary grinding jar is a grinding jar containing primary graphene. The vacuuming operation of the primary grinding jar using a vacuum pump after startup refers to using the vacuum pump to extract the gas inside the primary grinding jar, creating a near-vacuum or low-pressure environment. The pressure inside the replacement jar refers to the pressure inside the primary grinding jar. The high-purity argon cylinder is a cylinder containing argon gas with a purity greater than 99%. The argon filling of the replacement grinding jar using a pre-constructed high-purity argon cylinder refers to: connecting the high-purity argon cylinder to the replacement grinding jar, opening the valve of the high-purity argon cylinder, and slowly filling the replacement grinding jar with argon gas. The target pressure inside the jar refers to the pressure inside the replacement grinding jar. 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 of the primary graphene in the target primary grinding jar using a ball mill refers to controlling the target primary grinding jar to rotate using a ball mill, thereby causing the grinding balls inside the target primary grinding jar to impact, grind, and pulverize the primary graphene during the rotation. Preferably, the first ball milling speed is 200 rpm, and the first ball milling time is one hour.

[0111] It should be explained that the intermediate ball mill jar is a ball mill jar containing primary artificial graphite and primary ball milling raw materials.

[0112] It is understood that the method for obtaining the target intermediate grinding jar based on a vacuum pump, a pressure sensor, a high-purity argon cylinder, and an intermediate grinding jar, and the method for obtaining the target advanced grinding jar based on a vacuum pump, a pressure sensor, a high-purity argon cylinder, and an advanced grinding jar are the same as the method for obtaining the target primary grinding jar using a vacuum pump, a pressure sensor, a high-purity argon cylinder, and a primary grinding jar, and will not be described again here.

[0113] It should be understood that the ball milling operation of the primary artificial graphite and primary ball milling material in the target intermediate ball mill jar using a ball mill refers to controlling the rotation of the target intermediate ball mill jar with a ball mill, thereby causing the grinding balls in the target primary ball mill jar to impact, grind, pulverize, and mix the primary graphene during the rotation. The method of ball milling the primary conductive carbon black and intermediate ball milling material in the target advanced ball mill jar to obtain the mixed conductive material is the same as the method of ball milling the primary artificial graphite and primary ball milling material in the target intermediate ball mill jar to obtain the intermediate ball milling material, and will not be repeated here.

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

[0115] Confirm the mass of the grinding balls in the ball mill, and calculate the mass of graphene based on the mass of the grinding balls. The calculation formula is as follows:

[0116]

[0117] Where, m Gs For the mass of graphene, m X For the mass of the grinding ball, k x The preset ball-to-material ratio;

[0118] The mass of artificial graphite is calculated based on the mass of graphene and the preset first raw material ratio, using the following formula:

[0119]

[0120] Where, m Gra The mass of the artificial graphite is given by k1, where k1 is the first raw material ratio.

[0121] The mass of conductive carbon black is obtained based on the mass of graphene and the preset ratio of the second raw material.

[0122] Primary graphene is extracted from the graphene raw material in the conductive agent raw material set based on the quality of graphene; primary artificial graphite is extracted from the artificial graphite raw material in the conductive agent raw material set based on the quality of artificial graphite; and primary conductive carbon black is extracted from the conductive carbon black raw material in the conductive agent raw material set based on the quality of conductive carbon black. 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.

[0123] It should be explained that the grinding ball mass refers to the mass of the grinding balls themselves. The ball-to-material ratio is the ratio of the mass of the grinding balls (set manually) to the mass of graphene required for ball milling. Preferably, the ball-to-material ratio is 10. The first raw material ratio refers to 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 refers to 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 described again here.

[0125] For example, graphene of the same mass as graphene is extracted from graphene raw materials as primary graphene, artificial graphite of the same mass as artificial graphite is extracted from artificial graphite raw materials as primary artificial graphite, and conductive carbon black of the same mass as conductive carbon black is extracted from conductive carbon black raw materials as primary conductive carbon black.

[0126] Specifically, the ultrasonic mixing treatment of the mixed conductive raw materials and auxiliary raw materials using an ultrasonic disperser to obtain a composite electrode slurry includes:

[0127] The mixed conductive materials are weighed to obtain the mass of the mixed materials.

[0128] The mass of the active material is obtained based on the mass of the mixed raw materials and the preset third raw material ratio, and the mass of the binder is obtained based on the mass of the mixed raw materials and the preset fourth raw material ratio.

[0129] Primary active materials are extracted from the active materials in the auxiliary raw material set based on the quality of the active materials, and primary binders are extracted from the binders in the auxiliary raw material set based on the quality of the binders, wherein the quality of the primary active materials and the quality of the primary binders are the quality of the active materials and the quality of the binders, respectively.

[0130] A liquid mixing operation is performed on the mixed conductive raw material, primary active material and primary binder to obtain the original slurry. The original slurry is then placed in an ultrasonic homogenizer to obtain the primary slurry.

[0131] The preset initial ultrasonic frequency and preset initial power are input into the ultrasonic homogenizer to obtain the target homogenizer.

[0132] Start the target homogenizer, record the time in real time from the start time of the target homogenizer to obtain the ultrasonic time, and use the target homogenizer to perform homogenization and 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] Primary slurry samples were extracted from the primary electrode slurry. The primary slurry samples were tested using a densitometer, thermometer, viscometer, and turbidity meter to obtain the slurry density, slurry temperature, slurry dynamic viscosity, and slurry turbidity.

[0134] The slurry uniformity index is calculated based on slurry density, slurry temperature, slurry dynamic viscosity and slurry turbidity, and the slurry uniformity index is compared with the preset slurry uniformity threshold.

[0135] If the slurry uniformity index is greater than or equal to the preset slurry uniformity threshold, then a vacuum degassing operation is performed on the primary electrode slurry using a vacuum degassing machine to obtain a composite electrode slurry.

[0136] If the slurry uniformity index is less than the slurry uniformity threshold, then the corrected ultrasonic frequency and corrected power are calculated based on the slurry density, slurry temperature, slurry dynamic viscosity, slurry turbidity, initial ultrasonic frequency and initial power. 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 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 explained that the mass of the mixed raw materials refers to the mass of the mixed conductive raw materials. The third raw material ratio refers to the ratio of the mass of the mixed conductive raw materials required to manufacture the original slurry to the mass of the active material, and the fourth raw material ratio refers to the ratio of the mass of the mixed conductive raw materials required to manufacture 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 explained that the initial ultrasonic frequency refers to the frequency of the ultrasonic waves 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 with the initial ultrasonic frequency and initial power set. Preferably, the initial ultrasonic frequency is 20000 Hz and the initial power is 50 W.

[0139] It is understood that the liquid mixing operation of the mixed conductive raw materials, primary active materials, and primary binders refers to dissolving the mixed conductive raw materials, primary active materials, and primary binders in a certain mass of deionized water. The initial slurry refers to the solution containing the mixed conductive raw materials, primary active materials, and primary binders. The initial slurry refers to the initial slurry placed in an ultrasonic homogenizer.

[0140] It should be understood that the homogenization and mixing operation of the primary slurry using a target homogenizer refers to: using the target homogenizer to emit ultrasonic waves, and utilizing the physical effects (such as cavitation and shear force) generated by the high-frequency vibration of the ultrasonic waves to rapidly disperse, break down, or mix the mixed conductive raw materials, primary active materials, and primary binders in the primary slurry. Furthermore, the technology of using a target homogenizer to perform homogenization and mixing of the primary slurry is existing technology and will not be elaborated upon here.

[0141] For example, if the target homogenizer is started at 10:00, then at 10:02, the ultrasonic time is 2 minutes. If the homogenization 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 homogenization and mixing.

[0142] It should be explained that extracting a primary slurry sample from the primary electrode slurry means extracting a certain mass of primary electrode slurry as the primary slurry sample. Slurry density, slurry temperature, slurry dynamic viscosity, and slurry turbidity refer to the density, temperature, dynamic viscosity, and turbidity of the primary slurry sample, respectively. Furthermore, the technique of using a densitometer, thermometer, viscometer, and turbidimeter to perform detection operations on the primary slurry sample is existing technology and will not be elaborated upon here.

[0143] It should be understood that the vacuum degassing operation on the primary electrode slurry using a vacuum degassing machine refers to removing air bubbles present in the primary electrode slurry using a vacuum degassing machine. Furthermore, the technology of performing vacuum degassing on the primary electrode slurry using a vacuum degassing machine is existing technology and will not be elaborated upon here.

[0144] Understandably, the slurry uniformity index reflects the degree of uniformity in which the mixed conductive raw materials, primary active materials, and primary binders are mixed in the primary electrode slurry. A higher slurry uniformity index indicates a more uniform mixing of these components. The slurry uniformity threshold is set by the personnel at the electrode material preparation plant based on experience. For example, the personnel may use the average slurry uniformity index of multiple qualified primary electrode slurries produced by the plant historically as the slurry uniformity threshold.

[0145] In detail, the formula for calculating the slurry uniformity index is as follows:

[0146]

[0147] Where, φ H T is the slurry uniformity index. H T0 is the slurry temperature, T0 is the preset initial temperature, and σ is the slurry temperature. TU Turbidity of the slurry, μ dv ρ is the dynamic viscosity of the slurry. H Let be the slurry density, tanh be the hyperbolic tangent function, and e be the natural constant.

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

[0149] Specifically, the calculation and correction of the ultrasonic frequency and power based on the slurry density, slurry temperature, slurry dynamic viscosity, slurry turbidity, initial ultrasonic frequency, and initial power includes:

[0150] The corrected ultrasonic frequency is calculated based on the turbidity, dynamic viscosity, density, and initial ultrasonic frequency of the slurry. The calculation formula is shown below:

[0151]

[0152] Among them, v sou To correct the ultrasonic frequency, v0 is the initial ultrasonic frequency;

[0153] The corrected power is calculated based on the slurry temperature and initial power, using the following formula:

[0154]

[0155] Where, p sou To correct the power, p0 is the initial power, T c This is the preset reference temperature.

[0156] It should be explained that the corrected ultrasonic frequency is the frequency of the ultrasound waves 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 this embodiment of the invention, the initial ultrasonic frequency and initial power are corrected by adjusting the slurry temperature, slurry turbidity, slurry dynamic viscosity, and slurry density, and a more suitable corrected ultrasonic frequency and corrected power are calculated for homogenizing the primary slurry, thereby improving the mixing effect of homogenizing the primary slurry.

[0158] S4. Extract the composite fiber membrane from the composite fiber membrane set, use the extracted composite fiber membrane set as the new 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 tube furnace and a preset initial temperature to obtain composite carbonized material, and perform calendering treatment on the composite carbonized material using a preset initial pressure and a calender to obtain standard electrode material.

[0159] It should be explained that the composite fiber membrane set includes multiple composite fiber membranes, and the extraction of a composite fiber membrane from the composite fiber membrane set refers to extracting one composite fiber membrane from the multiple composite fiber membranes in the composite fiber membrane set.

[0160] It is understood that the calendering of the composite carbide material using a preset initial pressure and a calender refers to setting the pressure of the calender as the initial pressure and calendering the composite carbide material using the calender. Furthermore, the technique of calendering the composite carbide material using a preset initial pressure and a calender is existing technology and will not be elaborated upon here. Standard electrode material refers to the composite carbide material after calendering.

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

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

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

[0164] The composite fiber membrane is placed into a tube furnace to obtain the initial tube furnace. The initial tube furnace is then filled with argon gas using a high-purity argon gas cylinder to obtain the target tube furnace.

[0165] The target tube furnace is started, and the composite fiber membrane is sintered using the started target tube furnace. The temperature at which the composite fiber membrane is sintered by the target tube furnace is the relay temperature. The time of starting the target tube furnace is taken as the starting point and the time is recorded in real time to obtain the first sintering time. The target tube furnace is shut down when the first sintering time reaches the preset first time threshold to obtain the initial carbonized material.

[0166] The target tube furnace is started, and the initial carbonized material is calcined using the started target tube furnace. The calcination temperature of the initial carbonized material by the target tube furnace is the initial temperature. The second sintering time is obtained by starting the target tube furnace and recording the time in real time. The target tube furnace is shut down when the second sintering time reaches the preset second time threshold, and the composite carbonized material is obtained. The second time threshold is half of the first time threshold.

[0167] It should be explained that the initial tubular furnace is a tubular furnace with a composite fiber membrane inserted. The operation of filling the replacement ball mill jar with argon using a high-purity argon cylinder refers to: after connecting the high-purity argon cylinder to the initial tubular furnace, opening the valve of the high-purity argon cylinder and slowly filling the initial tubular furnace with argon.

[0168] For example, the target tube furnace is started and its operating temperature is set as the relay temperature. Since the target tube furnace is filled with argon, the composite fiber membrane is sintered at high temperature in the argon environment of the target tube furnace. If the target tube furnace is started at 12:00, then 12:00 is taken as the starting point and the time is recorded in real time. When 12:02, the first sintering time is 2 minutes. If the first time threshold is set to 30 minutes, then the target tube furnace is turned off at 12:30. Then the operating temperature of the target tube furnace is set as the initial temperature, and the initial carbonized material in the target tube furnace continues to be sintered at high temperature. If the second time threshold is 15 minutes, then the target tube furnace is turned off at 12:45, and the composite carbonized material is extracted from the target tube furnace.

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

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

[0171] In detail, the porosity conductivity analysis performed on the standard electrode sample to obtain the comprehensive conductivity index includes:

[0172] The standard electrode sample was weighed to obtain the mass of the standard sample.

[0173] A pre-built mercury porosimeter was used to perform mercury porosimeter tests on a standard electrode sample to obtain the mercury liquid filling volume. The test pressure of the mercury porosimeter for performing mercury porosimeter tests on the standard electrode sample was preset.

[0174] The porosity index of the sample is calculated based on the mercury filling volume, the mass of the standard sample, and the test pressure, using the following formula:

[0175]

[0176] Where, ε v V is the sample porosity index. Hg ρ is the volume of the mercury solution. Hg Given the preset density of mercury, m b For standard sample quality, P xFor testing stress, ln is the natural logarithm;

[0177] The comprehensive conductivity index is calculated based on the sample porosity index, and the calculation formula is as follows:

[0178]

[0179] Among them, I xc The comprehensive electrical conductivity index is given by ε0, which is a preset reference porosity index, and m is given by m. I m1 and m2 represent the mass of the mixed raw materials, the mass of the active materials, and the mass of the binder, respectively.

[0180] It should be explained that the standard sample quality refers to the quality of the standard electrode sample. Optionally, a fully automated mercury porosimeter from Macquarie can be used as the mercury porosimeter. Performing mercury porosimetry on the standard electrode sample using a pre-built mercury porosimeter means measuring the volume of mercury that can be forced into the standard electrode sample by the mercury porosimeter under the test pressure applied by the instrument. The mercury filling volume is the volume of mercury that can be forced into the standard electrode sample by the mercury porosimeter under the test pressure.

[0181] It should be understood that the standard electrode sample has many pores inside, so a certain volume of mercury can be forced into it under the test pressure applied by the mercury porosimeter. Furthermore, the mercury porosimeter method is prior art and will not be elaborated upon here. For example, after performing a mercury porosimeter test on the standard electrode sample, the mercury porosimeter automatically outputs a test report, from which the mercury filling volume can be read.

[0182] It is understood that the sample porosity index reflects the porosity of the standard electrode sample; the larger the sample porosity index, the greater the porosity of the standard electrode sample.

[0183] It should be understood that when the porosity of a standard electrode sample is too high, the pores, acting as insulating regions, reduce the continuous conductive channels within the sample, hindering electron transport and resulting in low conductivity. Conversely, when the porosity is too low, the electrolyte in the battery cannot easily penetrate the standard electrode material used to manufacture battery electrodes, restricting ion diffusion and further reducing conductivity. The ratio between the mass of the mixed raw materials, active materials, and binder reflects the proportion of these components used in manufacturing the standard electrode material, and also affects its conductivity. Therefore, the overall conductivity index reflects the conductivity of the standard electrode material corresponding to the sample; a higher index indicates higher conductivity.

[0184] For example, staff use the average porosity index of a sample of multiple qualified standard electrode materials pre-produced in the factory as a reference porosity index.

[0185] Specifically, the calculation of the update temperature and update pressure using the initial temperature and initial pressure includes:

[0186] The updated temperature is calculated based on the sample porosity index, the reference porosity index, and the initial temperature, using the following formula:

[0187]

[0188] Among them, T y To update the temperature, T x The initial temperature;

[0189] The updated pressure is calculated based on the sample porosity index, the reference porosity index, and the initial pressure.

[0190] It should be understood that the method for calculating the updated pressure based on the sample porosity index, the reference porosity index, and the initial pressure is the same as the method for calculating the updated temperature using the sample porosity index, the reference porosity index, and the initial temperature, and will not be described again here.

[0191] S6. 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.

[0192] S7. 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, and the updated fiber membrane set is used as the composite fiber membrane set. The process of extracting the composite fiber membrane from the composite fiber membrane set is repeated until there are no composite fiber membranes in the composite fiber membrane set.

[0193] It should be understood that, in the embodiments of the present invention, by updating the initial temperature and updating the initial pressure, the initial temperature in the high-temperature sintering process and the initial pressure in the calendering process are continuously optimized during the repeated extraction of the composite fiber membrane, thereby improving the product quality of the standard electrode material.

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

[0195] For example, the target electrode material in the target electrode material set is the graphene-doped electrode material required by the factory for manufacturing needle-type lithium batteries.

[0196] To address the problems described in the background art, this invention provides a set of conductive agent raw materials and an auxiliary raw material set. The conductive agent raw material set includes graphene raw materials, artificial graphite raw materials, and conductive carbon black raw materials. The auxiliary raw material set includes active materials and binders. Therefore, by obtaining the conductive agent raw material set and the auxiliary raw material set, this invention provides a raw material basis for the subsequent preparation of composite electrode slurry, thereby confirming the 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 grinding jar, grinding balls, a vacuum pump, and a pressure sensor. The ultrasonic disperser includes a vacuum degasser, a densitometer, a thermometer, a viscometer, a turbidimeter, and an ultrasonic homogenizer. Therefore, this invention provides a set of conductive agent raw materials and an auxiliary raw material set, thereby providing a raw material basis for the subsequent preparation of composite electrode slurry. The electrode preparation mechanism includes a ball mill, an ultrasonic disperser, an ultrasonic degasser, a densitometer, a thermometer, a viscometer, a turbidimeter, and an ultrasonic homogenizer. The electrode preparation mechanism was confirmed to provide the necessary equipment and a complete preparation environment for the electrode material preparation process. The conductive agent raw material set was subjected to segmented ball milling to obtain a mixed conductive raw material. The mixed conductive raw material and auxiliary raw material set were then ultrasonically mixed using an ultrasonic disperser to obtain a composite electrode slurry. The composite electrode slurry was then electrospun using an electrospinning machine to obtain a composite fiber membrane set. It can be seen that the embodiments of the present invention utilize a ball mill and ultrasonic disperser to sufficiently mix the conductive agent raw material set and auxiliary raw material set, and then use electrospinning to form a composite fiber membrane with higher conductivity from the composite electrode slurry, thereby improving the conductivity and product quality of the electrode material. The composite fiber membrane was extracted from the composite fiber membrane set, and the extracted composite fiber membrane was then... The composite fiber membrane set is used as a replacement fiber membrane set, and the following operations are performed on the extracted composite fiber membrane: High-temperature sintering of the composite fiber membrane is performed using a tube furnace at a preset initial temperature to obtain a composite carbonized material; the composite carbonized material is then calendered using a preset initial pressure and a 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 process of the calender. A 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 then... As the target electrode material, the updated fiber membrane set is used as the composite fiber membrane set. The process returns to the step of extracting the composite fiber membrane from the composite fiber membrane set until no composite fiber membrane remains 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, and the update pressure is used as the initial pressure. The updated fiber membrane set is then 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 remains in the composite fiber membrane set. The target electrode materials are then summarized to obtain the target electrode material set, completing 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 comprehensive conductivity index.This invention improves the automation level of the electrode material preparation process and optimizes the process parameters of the high-temperature sintering process in the tube furnace and the calendering process in the rolling mill by utilizing the comprehensive conductivity index to control the initial temperature and pressure, thereby further improving the product quality of the electrode material. Therefore, this invention can improve the automation level of the electrode material preparation process, enhance the conductivity of the electrode material, and improve product quality.

[0197] like Figure 2 The diagram shown is a functional block diagram of a graphene-doped needle-type lithium battery electrode material preparation system provided in an embodiment of the present invention.

[0198] The graphene-doped needle-type lithium battery electrode material preparation system 100 of the present invention can be installed in an electronic device. Depending on the functions to be implemented, the graphene-doped needle-type lithium battery electrode material preparation system 100 may include a material preparation module 101, a conductive raw material mixing module 102, a composite material processing module 103, and a conductivity performance evaluation module 104. The module described in this invention can also be referred to as a unit, which refers to a series of computer program segments that can be executed by the processor of an electronic device and can perform a fixed function, and are stored in the memory of the electronic device.

[0199] The material preparation module 101 is used to obtain a set of conductive agent raw materials and a set of auxiliary raw materials. The set of conductive agent raw materials includes graphene raw materials, artificial graphite raw materials and conductive carbon black raw materials. The set of auxiliary raw materials includes active materials and binders. The electrode preparation mechanism is confirmed. 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 jar, 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.

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

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

[0202] The conductivity performance evaluation module 104 is used to extract standard electrode samples from standard electrode materials, perform pore conductivity analysis on the standard electrode samples 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, then the standard electrode material after extracting the standard electrode samples is used as the target electrode material, 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 is found in the composite fiber membrane set. If the comprehensive conductivity index is less than the conductivity threshold, then 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 process returns to the step of extracting the composite fiber membrane from the composite fiber membrane set until no composite fiber membrane is found in the composite fiber membrane set. Finally, the target electrode materials are summarized to obtain the target electrode material set, thus completing the preparation of the needle-type lithium battery electrode material.

[0203] In detail, the modules in the graphene-doped needle-type lithium battery electrode material preparation system 100 described in this embodiment of the invention employ the same methods as described above during use. Figure 1 The method used is the same as the one described above for preparing needle-type lithium battery electrode materials based on graphene doping, and it can produce the same technical effect, so it will not be repeated here.

[0204] like Figure 3 The diagram shown is a schematic representation of an electronic device that implements a method for preparing needle-type lithium battery electrode materials based on graphene doping, according to 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 also include a computer program stored in the memory 11 and executable on the processor 10, such as a program for preparing a needle-type lithium battery electrode material based on graphene doping.

[0206] The memory 11 includes at least one type of readable storage medium, such as flash memory, portable hard drive, multimedia card, card-type memory (e.g., SD or DX memory), magnetic memory, disk, optical disk, etc. In some embodiments, the memory 11 can be an internal storage unit of the electronic device 1, such as a portable hard drive. In other embodiments, the memory 11 can be an external storage device of the electronic device 1, such as a plug-in portable hard drive, smart media card (SMC), secure digital card (SD), flash card, etc., equipped on the electronic device 1. Furthermore, the memory 11 includes both internal storage units and external storage devices of the electronic device 1. The memory 11 can be used not only to store application software and various types of data installed on the electronic device 1, such as code for a method of preparing electrode materials for graphene-doped needle-type lithium batteries, but also to temporarily store data that has been output or will be output.

[0207] In some embodiments, the processor 10 may be composed of integrated circuits, such as a single packaged integrated circuit or multiple integrated circuits with the same or different functions, including combinations of one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and various control chips. The processor 10 is the control unit of the electronic device, connecting various components of the entire electronic device through various interfaces and lines. It executes programs or modules stored in the memory 11 (e.g., a program for preparing graphene-doped needle-type lithium battery electrode materials) and calls data stored in the memory 11 to perform various functions of the electronic device 1 and process data.

[0208] The bus 12 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus 12 can be divided into an address bus, a data bus, a control bus, etc. The bus 12 is configured to realize the connection and communication between the memory 11 and at least one processor 10, etc.

[0209] Figure 3 Only electronic devices with components are shown; it will be understood by those skilled in the art that... Figure 3The structure shown does not constitute a limitation on the electronic device 1, and may include fewer or more components than shown, or combine certain components, or have different component arrangements.

[0210] For example, although not shown, the electronic device 1 may also include a power supply (such as a battery) to power various components. Preferably, the power supply can be logically connected to the at least one processor 10 through a power management device, thereby enabling functions such as charging management, discharging management, and power consumption management. The power supply may also include one or more DC or AC power supplies, recharging devices, power fault detection circuits, power converters or inverters, power status indicators, and other arbitrary components. The electronic device 1 may also include various sensors, Bluetooth modules, Wi-Fi modules, etc., which will not be described in detail here.

[0211] Furthermore, the electronic device 1 may also 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 typically used to establish communication connections between the electronic device 1 and other electronic devices.

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

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

[0214] Obtain a set of conductive agent raw materials and a set of auxiliary raw materials. The set of conductive agent raw materials includes: graphene raw materials, artificial graphite raw materials and conductive carbon black raw materials. The set of auxiliary raw materials includes: active materials and binders.

[0215] The electrode preparation mechanism is identified, which includes: a ball mill, an ultrasonic disperser, an electrospinning machine, a tube furnace, and a calender. The ball mill includes: a grinding jar, grinding balls, a vacuum pump, and a pressure sensor. The ultrasonic disperser includes: a vacuum degasser, 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 to obtain mixed conductive raw material. The mixed conductive raw material set and auxiliary raw material set are subjected to ultrasonic mixing treatment using an ultrasonic disperser to obtain composite electrode slurry. The composite electrode slurry is electrospun using an electrospinning machine to obtain composite fiber membrane set.

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

[0218] High-temperature sintering of the composite fiber membrane is performed using a tube furnace and a preset initial temperature to obtain a composite carbonized material. The composite carbonized material is then calendered using a preset initial pressure and a calender to obtain a standard electrode material.

[0219] Standard electrode samples are extracted from standard electrode materials, and pore conductivity analysis is performed on the standard electrode samples to obtain a comprehensive conductivity index. The comprehensive conductivity index is then 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 overall 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, and the updated fiber membrane set is used as the composite fiber membrane set. The process of extracting the composite fiber membrane from the composite fiber membrane set is repeated until there is no composite fiber membrane in the composite fiber membrane set.

[0222] By summarizing the target electrode materials, a set of target electrode materials is obtained, thus completing the preparation of electrode materials for needle-type lithium batteries.

[0223] Specifically, the processor 10's implementation method for the above instructions can be found in [reference needed]. Figures 1 to 3 The descriptions of the relevant steps in the corresponding embodiments are not repeated here.

[0224] Furthermore, if the modules / units integrated in the electronic device 1 are implemented as 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 may include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, or a read-only memory (ROM).

[0225] The present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor of an electronic device, can perform the following:

[0226] Obtain a set of conductive agent raw materials and a set of auxiliary raw materials. The set of conductive agent raw materials includes: graphene raw materials, artificial graphite raw materials and conductive carbon black raw materials. The set of auxiliary raw materials includes: active materials and binders.

[0227] The electrode preparation mechanism is identified, which includes: a ball mill, an ultrasonic disperser, an electrospinning machine, a tube furnace, and a calender. The ball mill includes: a grinding jar, grinding balls, a vacuum pump, and a pressure sensor. The ultrasonic disperser includes: a vacuum degasser, a densitometer, a thermometer, a viscometer, a turbidimeter, and an ultrasonic homogenizer.

[0228] The conductive agent raw material set is subjected to segmented ball milling to obtain mixed conductive raw material. The mixed conductive raw material set and auxiliary raw material set are subjected to ultrasonic mixing treatment using an ultrasonic disperser to obtain composite electrode slurry. The composite electrode slurry is electrospun using an electrospinning machine to obtain composite fiber membrane set.

[0229] Composite fiber membranes are extracted from the composite fiber membrane set. The composite fiber membrane set from which the composite fiber membranes have been extracted is used as the new fiber membrane set, and the following operations are performed on the extracted composite fiber membranes:

[0230] High-temperature sintering of the composite fiber membrane is performed using a tube furnace and a preset initial temperature to obtain a composite carbonized material. The composite carbonized material is then calendered using a preset initial pressure and a calender to obtain a standard electrode material.

[0231] Standard electrode samples are extracted from standard electrode materials, and pore conductivity analysis is performed on the standard electrode samples to obtain a comprehensive conductivity index. The comprehensive conductivity index is then compared with a preset conductivity threshold.

[0232] 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.

[0233] If the overall 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, and the updated fiber membrane set is used as the composite fiber membrane set. The process of extracting the composite fiber membrane from the composite fiber membrane set is repeated until there is no composite fiber membrane in the composite fiber membrane set.

[0234] By summarizing the target electrode materials, a set of target electrode materials is obtained, thus completing the preparation of electrode materials for needle-type lithium batteries.

[0235] In the embodiments provided by this 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 merely illustrative, and actual implementations may have other classification methods.

[0236] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0237] Furthermore, the functional modules in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in the form of hardware plus software functional modules.

[0238] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential 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 are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention 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 includes: Obtain a set of conductive agent raw materials and a set of auxiliary raw materials. The set of conductive agent raw materials includes: graphene raw materials, artificial graphite raw materials and conductive carbon black raw materials. The set of auxiliary raw materials includes: active materials and binders. The electrode preparation mechanism is identified, which includes: a ball mill, an ultrasonic disperser, an electrospinning machine, a tube furnace, and a calender. The ball mill includes: a grinding jar, grinding balls, a vacuum pump, and a pressure sensor. The ultrasonic disperser includes: a vacuum degasser, a densitometer, a thermometer, a viscometer, a turbidimeter, and an ultrasonic homogenizer. The conductive agent raw material set is subjected to segmented ball milling to obtain mixed conductive raw material. The mixed conductive raw material set and auxiliary raw material set are subjected to ultrasonic mixing treatment using an ultrasonic disperser to obtain composite electrode slurry. The composite electrode slurry is electrospun using an electrospinning machine to obtain composite fiber membrane set. Composite fiber membranes are extracted from the composite fiber membrane set. The composite fiber membrane set from which the composite fiber membranes have been extracted is used as the new fiber membrane set, and the following operations are performed on the extracted composite fiber membranes: High-temperature sintering of the composite fiber membrane is performed using a tube furnace and a preset initial temperature to obtain a composite carbonized material. The composite carbonized material is then calendered using a preset initial pressure and a calender to obtain a standard electrode material. Standard electrode samples are extracted from standard electrode materials, and pore conductivity analysis is performed on the standard electrode samples to obtain a comprehensive conductivity index. The comprehensive conductivity index is then 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 overall 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, and the updated fiber membrane set is used as the composite fiber membrane set. The process of extracting the composite fiber membrane from the composite fiber membrane set is repeated until there is no composite fiber membrane in the composite fiber membrane set. By summarizing the target electrode materials, a set of target electrode materials is obtained, thus completing the preparation of electrode materials for needle-type lithium batteries.

2. The method for preparing needle-type lithium battery electrode material based on graphene doping as described in claim 1, characterized in that, The process of segmenting the conductive agent raw material set using a ball mill to obtain a mixed conductive raw material includes: Primary graphene, primary artificial graphite, and primary conductive carbon black are obtained using ball mills and conductive agent raw material sets. Primary graphene is placed into the ball mill jar of a ball mill to obtain a primary ball mill jar. The vacuum pump is started to perform a vacuuming operation on the primary ball mill jar. The pressure sensor is used to monitor the pressure inside the replacement jar of the primary ball mill jar in real time until the pressure inside the replacement jar is less than or equal to a preset first pressure threshold. Then the vacuum pump is turned off to obtain a replacement ball mill jar. Argon gas is used to fill the new ball mill jar with a pre-constructed high-purity argon gas cylinder, and the gas pressure inside the target jar is monitored in real time by a gas pressure sensor until the gas pressure inside the target jar is greater than or equal to a preset second gas pressure threshold, thus obtaining the target primary ball mill jar. A ball mill is used to perform a ball milling operation on the primary graphene in the target primary ball milling jar to obtain primary ball milling raw material. The rotation speed and time of the ball mill performing 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. Primary artificial graphite and primary ball milling raw materials are placed into the ball mill jar of a ball mill to obtain an intermediate ball mill jar. The target intermediate ball mill jar is obtained based on a vacuum pump, a pressure sensor, a high-purity argon cylinder, and the intermediate ball mill jar. A ball mill is used to perform a ball milling operation on the primary artificial graphite and the primary ball milling material in the target intermediate ball milling jar to obtain intermediate ball milling material. The rotational speed and time of the ball mill performing the ball milling operation on the primary artificial graphite and the primary ball milling material in the target intermediate ball milling jar are the second ball milling speed and the second ball milling time, respectively. The second ball milling speed is twice the first ball milling speed, and the second ball milling time is half the first ball milling time. Primary conductive carbon black and intermediate ball milling raw materials are placed into the ball mill jar of a ball mill to obtain an advanced ball mill jar. The target advanced ball mill jar is obtained based on a vacuum pump, a pressure sensor, a high-purity argon cylinder, and the advanced ball mill jar. A ball mill is used to perform ball milling operations on the primary conductive carbon black and the intermediate ball milling raw material in the target advanced ball milling jar to obtain a mixed conductive raw material. The rotational speed and time of the ball mill for performing the ball milling operation on the primary conductive carbon black and the intermediate ball milling raw material in the target advanced ball milling jar are respectively the third ball milling speed and the third ball milling time, and the third ball milling speed is twice the second ball milling speed, and the third ball milling time is half the second ball milling time.

3. The method for preparing needle-type lithium battery electrode material based on graphene doping as described in claim 2, characterized in that, The method for obtaining primary graphene, primary artificial graphite, and primary conductive carbon black based on a ball mill and conductive agent raw material set includes: Confirm the mass of the grinding balls in the ball mill, and calculate the mass of graphene based on the mass of the grinding balls. The calculation formula is as follows: Where, m Gs For the mass of graphene, m X For the mass of the grinding ball, k x The preset ball-to-material ratio; The mass of artificial graphite is calculated based on the mass of graphene and the preset first raw material ratio, using the following formula: Where, m Gra The mass of the artificial graphite is given by k1, where k1 is the first raw material ratio. The mass of conductive carbon black is obtained based on the mass of graphene and the preset ratio of the second raw material. Primary graphene is extracted from the graphene raw material in the conductive agent raw material set based on the quality of graphene; primary artificial graphite is extracted from the artificial graphite raw material in the conductive agent raw material set based on the quality of artificial graphite; and primary conductive carbon black is extracted from the conductive carbon black raw material in the conductive agent raw material set based on the quality of conductive carbon black. 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 needle-type lithium battery electrode material based on graphene doping as described in claim 3, characterized in that, The method involves using an ultrasonic disperser to perform ultrasonic mixing treatment on the mixed conductive raw materials and auxiliary raw materials to obtain a composite electrode slurry, comprising: The mixed conductive materials are weighed to obtain the mass of the mixed materials. The mass of the active material is obtained based on the mass of the mixed raw materials and the preset third raw material ratio, and the mass of the binder is obtained based on the mass of the mixed raw materials and the preset fourth raw material ratio. Primary active materials are extracted from the active materials in the auxiliary raw material set based on the quality of the active materials, and primary binders are extracted from the binders in the auxiliary raw material set based on the quality of the binders, wherein the quality of the primary active materials and the quality of the primary binders are the quality of the active materials and the quality of the binders, respectively. A liquid mixing operation is performed on the mixed conductive raw material, primary active material and primary binder to obtain the original slurry. The original slurry is then placed in an ultrasonic homogenizer to obtain the primary slurry. The preset initial ultrasonic frequency and preset initial power are input into the ultrasonic homogenizer to obtain the target homogenizer. Start the target homogenizer, record the time in real time from the start time of the target homogenizer to obtain the ultrasonic time, and use the target homogenizer to perform homogenization and 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. Primary slurry samples were extracted from the primary electrode slurry. The primary slurry samples were tested using a densitometer, thermometer, viscometer, and turbidity meter to obtain the slurry density, slurry temperature, slurry dynamic viscosity, and slurry turbidity. The slurry uniformity index is calculated based on slurry density, slurry temperature, slurry dynamic viscosity and slurry turbidity, and the slurry uniformity index is compared with the preset slurry uniformity threshold. If the slurry uniformity index is greater than or equal to the preset slurry uniformity threshold, then a vacuum degassing operation is performed on the primary electrode slurry using a vacuum degassing machine to obtain a composite electrode slurry. If the slurry uniformity index is less than the slurry uniformity threshold, then the corrected ultrasonic frequency and corrected power are calculated based on the slurry density, slurry temperature, slurry dynamic viscosity, slurry turbidity, initial ultrasonic frequency and initial power. 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 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 needle-type lithium battery electrode material based on graphene doping as described in claim 4, characterized in that, The formula for calculating the uniformity index of the slurry is as follows: Where, φ H T is the slurry uniformity index. H T0 is the slurry temperature, T0 is the preset initial temperature, and σ is the slurry temperature. TU Turbidity of the slurry, μ dv ρ is the dynamic viscosity of the slurry. H Let be the slurry density, tanh be the hyperbolic tangent function, and e be the natural constant.

6. The method for preparing needle-type lithium battery electrode material based on graphene doping as described in claim 5, characterized in that, The calculation and correction of ultrasonic frequency and power based on slurry density, slurry temperature, slurry dynamic viscosity, slurry turbidity, initial ultrasonic frequency, and initial power includes: The corrected ultrasonic frequency is calculated based on the turbidity, dynamic viscosity, density, and initial ultrasonic frequency of the slurry. The calculation formula is shown below: Among them, v sou To correct the ultrasonic frequency, v0 is the initial ultrasonic frequency; The corrected power is calculated based on the slurry temperature and initial power, using the following formula: Where, p sou To correct the power, p0 is the initial power, T c This is the preset reference temperature.

7. The method for preparing needle-type lithium battery electrode material based on graphene doping as described in claim 6, characterized in that, The composite fiber membrane is subjected to high-temperature sintering in a tube furnace at a preset initial temperature to obtain a composite carbonized material, including: The relay temperature is determined based on the initial temperature, where the relay temperature is half of the initial temperature; The composite fiber membrane is placed into a tube furnace to obtain the initial tube furnace. The initial tube furnace is then filled with argon gas using a high-purity argon gas cylinder to obtain the target tube furnace. The target tube furnace is started, and the composite fiber membrane is sintered using the started target tube furnace. The temperature at which the composite fiber membrane is sintered by the target tube furnace is the relay temperature. The time of starting the target tube furnace is taken as the starting point and the time is recorded in real time to obtain the first sintering time. The target tube furnace is shut down when the first sintering time reaches the preset first time threshold to obtain the initial carbonized material. The target tube furnace is started, and the initial carbonized material is calcined using the started target tube furnace. The calcination temperature of the initial carbonized material by the target tube furnace is the initial temperature. The second sintering time is obtained by starting the target tube furnace and recording the time in real time. The target tube furnace is shut down when the second sintering time reaches the preset second time threshold, and the composite carbonized material is obtained. The second time threshold is half of the first time threshold.

8. The method for preparing needle-type lithium battery electrode material based on graphene doping as described in claim 7, characterized in that, The pore conductivity analysis performed on the standard electrode sample yields a comprehensive conductivity index, including: The standard electrode sample was weighed to obtain the mass of the standard sample. A pre-built mercury porosimeter was used to perform mercury porosimeter tests on a standard electrode sample to obtain the mercury liquid filling volume. The test pressure of the mercury porosimeter for performing mercury porosimeter tests on the standard electrode sample was preset. The porosity index of the sample is calculated based on the mercury filling volume, the mass of the standard sample, and the test pressure, using the following formula: Where, ε v V is the sample porosity index. Hg ρ is the volume of the mercury solution. Hg Given the preset density of mercury, m b For standard sample quality, P x For testing stress, ln is the natural logarithm; The comprehensive conductivity index is calculated based on the sample porosity index, and the calculation formula is as follows: Among them, I xc The comprehensive electrical conductivity index is given by ε0, which is a preset reference porosity index, and m is given by m. I m1 and m2 represent the mass of the mixed raw materials, the mass of the active materials, and the mass of the binder, respectively.

9. The method for preparing the graphene-doped needle-type lithium battery electrode material as described in claim 8, characterized in that, The calculation of update temperature and update pressure using initial temperature and initial pressure includes: The updated temperature is calculated based on the sample porosity index, the reference porosity index, and the initial temperature, using the following formula: Among them, T y To update the temperature, T x The initial temperature; The updated pressure is calculated based on the sample porosity index, the reference porosity 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 includes: The material preparation module is used to obtain the conductive agent raw material set and the 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 materials and binders. The module also confirms the electrode preparation mechanism, which includes: ball mill, ultrasonic disperser, electrospinning machine, tube furnace and calender. The ball mill includes: ball milling jar, grinding balls, vacuum pump and pressure sensor. The ultrasonic disperser includes: vacuum degasser, densitometer, thermometer, viscometer, turbidimeter and ultrasonic homogenizer. The conductive raw material mixing module is used to perform segmented ball milling of the conductive agent raw material set to obtain mixed conductive raw material. The mixed conductive raw material set and the auxiliary raw material set are ultrasonically mixed using an ultrasonic disperser to obtain composite electrode slurry. The composite electrode slurry is electrospun using an electrospinning machine to obtain composite fiber membrane set. The composite material processing module is used to extract composite fiber membranes from the composite fiber membrane set, use the extracted composite fiber membrane set as the new fiber membrane set, and perform the following operations on the extracted composite fiber membranes: perform high-temperature sintering operation on the composite fiber membranes using a tube furnace and a preset initial temperature to obtain composite carbonized materials, and perform calendering treatment on the composite carbonized materials using a preset initial pressure and a calender to obtain standard electrode materials. The conductivity performance evaluation module is used to extract standard electrode samples from standard electrode materials, perform pore conductivity analysis on the standard electrode samples 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, then the standard electrode material after extracting the standard electrode samples is used as the target electrode material, and the updated fiber membrane set is used as the composite fiber membrane set. The process returns to the step of extracting the composite fiber membrane from the composite fiber membrane set until no composite fiber membrane is found in the composite fiber membrane set. If the comprehensive conductivity index is less than the conductivity threshold, then 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 process returns to the step of extracting the composite fiber membrane from the composite fiber membrane set until no composite fiber membrane is found in the composite fiber membrane set. Finally, the target electrode materials are summarized to obtain the target electrode material set, completing the preparation of the needle-type lithium battery electrode material.

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