5676results about "Electrode manufacturing processes" patented technology

A ternary polycrystalline positive electrode material is a secondary ball formed by agglomerating primary particles, the secondary ball is equally divided into four parts in the direction from the center to the surface of the secondary ball, the four parts are an inner core layer, a first middle layer, a second middle layer and a shell layer, and the section of the ternary polycrystalline positive electrode material is observed through a scanning electron microscope. The porosity is sequentially reduced from inside to outside. The preparation method comprises the following steps: mixing a positive electrode material precursor, a lithium source and a Li-containing polyanion compound, and sintering at a high temperature to obtain a primary sintered matrix; and washing and drying the primary sintering substrate, mixing the primary sintering substrate with a coating agent, and sintering to obtain the ternary polycrystalline positive electrode material. The invention also discloses a lithium ion battery. The porosity of the section of the positive electrode material is sequentially reduced from inside to outside, so that the positive electrode material can be in more sufficient contact with an electrolyte, more diffusion paths are formed, the transmission obstruction of lithium ions is reduced, and the transmission rate of the lithium ions is effectively improved, so that the discharge performance of the positive electrode material is improved, and the cycle performance of the material is improved.

The invention provides a lithium iron phosphate-based positive electrode material and a preparation method thereof, a positive plate and a battery, the lithium iron phosphate-based positive electrode material comprises a lithium iron phosphate matrix and a carbon material existing on the surface of the lithium iron phosphate matrix, and the lithium iron phosphate-based positive electrode material comprises mesopores and macropores. The conductivity and the ion transmission performance of the lithium iron phosphate-based positive electrode material can be both improved, and the energy density and the rate capability of the battery are improved.

The invention relates to the technical field of electrode preparation, and discloses a dry-method electrode preparation process control method and system and a storage medium. The method comprises the steps that in the rolling forming process of a dry-method electrode material, pressure roller gap data and rotation angle data of a driving motor are monitored and collected in real time, and a support vector machine algorithm is used for recognizing the transmission ratio change trend of a pressure roller system; calculating a pitch precision offset caused by wear through Kalman filtering in combination with historical wear data; when the offset exceeds the limit, an adjustment coefficient is generated based on a simulation model, and the control precision is improved through feed-forward compensation and feedback optimization; when the adjustment precision meets the process requirement, a self-adaptive parameter set is determined through dynamic deviation residual analysis, and an actuator is driven to adjust the gap between the compression rollers; and monitoring the thickness uniformity index of the electrode plate produced after adjustment in real time, and finally forming quality closed-loop control by taking the thickness uniformity of the electrode plate as a verification standard. According to the invention, the quality precision of dry-method electrode production is improved.

The invention discloses an artificial SEI material and a preparation method thereof, an artificial SEI film and an artificial SEI film modified negative electrode. The artificial SEI material is an organic polymer brush (CNF-g-PSSX) prepared by grafting cellulose nanofibers with polystyrene sulfonate. The polymer brush is of a crystal structure and has a firm framework; and the side chain of polystyrene sulfonate has rich-SO3 functional groups which are matched with cations in sulfonate, so that a rapid ion transmission channel is provided, high-current-density circulation can be realized, and good interface contact is ensured. Due to a special molecular topological structure and a multi-component synergistic effect, when the organic polymer brush forms an artificial SEI film, high mechanical strength, high ionic conductivity and low interface impedance can be obtained at the same time, and through strong electrostatic repulsion between a negatively charged-SO3 group and the surface of a negatively charged lithium dendrite tip, the electrochemical performance of the artificial SEI film is improved. An obvious inhibition effect is shown on the continuous growth of dendritic crystals.

Example embodiments provide a secondary battery manufacturing system. The system includes a positive electrode cutter configured to cut a positive electrode sheet wound from a positive electrode roll to provide a plurality of positive electrodes, a negative electrode cutter configured to cut a negative electrode sheet wound from a negative electrode roll to provide a plurality of negative electrodes, an electrode identifier (ID) reader configured to sense an electrode ID of a negative electrode tab of each of the plurality of negative electrodes to generate an electrode ID sensing signal, and a controller configured to collect coordinate-related electrode ID data based on a first input amount of the positive electrode sheet, a second input amount of the negative electrode sheet, and the electrode ID sensing signal.

The invention relates to the field of current collector films, in particular to a high-temperature-resistant current collector base film and a preparation method thereof. The current collector base film is prepared from the following components in parts by weight: 75 to 85 parts of PET (Polyethylene Terephthalate) resin, 8 to 12 parts of high-temperature-resistant modifier, 5 to 8 parts of silane modified nano silicon dioxide, 0.5 to 1.5 parts of lubricant, 0.5 to 1.5 parts of stabilizer, 1 to 3 parts of nucleating agent and 0.2 to 1 part of antioxidant. According to the current collector base film, PET resin is used as a main material, a high-temperature-resistant modifier and silane modified nano silicon dioxide are added to serve as reinforcing modifiers, and meanwhile other auxiliaries are added. The prepared current collector base film has excellent high-temperature resistance and good mechanical strength, also has better flame retardance and excellent comprehensive performance, and is particularly suitable for preparing a composite current collector for a lithium battery with high safety and long service life.

The utility model relates to the technical field of mechanical detection, in particular to a slitting knife leaning amount detection device which comprises a supporting unit and a detection unit. Wherein a knife rest of the slitting knife is placed on the supporting unit. The detection unit is connected to the supporting unit and comprises a CCD sensor assembly, and the CCD sensor assembly is arranged towards the slitting knife so as to detect the knife leaning amount of the slitting knife. Compared with a manual visual inspection mode for determining the cutter leaning amount, the CCD sensor assembly is used for detecting the cutter leaning amount of the slitting cutter, the detection efficiency and the detection precision can be improved, and the product quality is guaranteed.

The invention discloses a ternary positive electrode material, a preparation method thereof and an electrochemical device. The preparation method comprises the following steps: mixing a continuous ternary precursor, a lithium source and an aluminum source, and carrying out first sintering to obtain a first sintered product; the primary sintering product is subjected to secondary sintering and dispersion, a single-crystal base material is obtained, the base material comprises a plurality of primary particles, the average size of the primary particles ranges from 2 micrometers to 3 micrometers, and the median particle size Dv50 of the primary particles ranges from 3 micrometers to 5 micrometers; mixing the matrix material with an aqueous solution of lithium phosphate, and carrying out wet coating to obtain a coated product; and sintering the coated product for the third time, so that the lithium phosphate forms a coating layer on the surface of the matrix material, and the ternary positive electrode material is obtained. According to the invention, through two-parameter control of the average size and the median particle size of the matrix material and simultaneous aluminum element internal doping and lithium phosphate surface coating of the matrix material, the structural stability and the cycle performance of the ternary positive electrode material are improved and the service life of the ternary positive electrode material is prolonged through a synergistic effect.

The invention discloses a lithium iron manganese phosphate positive electrode material and a preparation method thereof, a positive electrode plate and a secondary battery, and belongs to the technical field of lithium iron manganese phosphate batteries, the lithium iron manganese phosphate positive electrode material comprises a lithium iron manganese phosphate positive electrode active material and a solid electrolyte interface film located on the surface of the lithium iron manganese phosphate positive electrode active material, the solid electrolyte interface film contains C, N, F and O elements, and the ratio of the relative content of the C element to the relative content of the N element in the solid electrolyte interface film is (0.5-2): 1. According to the solid electrolyte interface film, the dissolution of manganese ions and the decomposition side reaction of the electrolyte at high voltage / high temperature are remarkably inhibited, the generation of gas is fundamentally reduced, the battery is free from flatulence phenomenon after being circulated at high temperature, and the safety and the reliability of the battery are greatly improved.

The invention discloses a tantalum-doped lithium metal composite negative electrode and a preparation method thereof. The preparation method comprises the following steps: melting solid-state lithium metal into liquid-state lithium metal; the tantalum metal is added into the liquid lithium metal to be mixed and stirred, the tantalum-doped lithium metal composite material is obtained after standing and cooling, and the adding amount of the tantalum metal is 0.1-10 wt% of the mass of the liquid lithium metal; and rolling the tantalum-doped lithium metal composite material to obtain the tantalum-doped lithium metal composite negative electrode, so that the tantalum is introduced into the lithium metal through a melt doping process, and the formed tantalum-doped lithium metal composite negative electrode can inhibit the growth of lithium dendrites and prolong the cycle life of the battery.

The invention relates to the technical field of battery current collectors, and discloses a high-conductivity stainless steel foil for a positive current collector and a preparation method of the high-conductivity stainless steel foil. Comprising the following operation steps that 1, stainless steel foil is subjected to acid pickling and then dried, the stainless steel foil is soaked in an ethylenediamine tetramethylenephosphonic acid ethanol solution to be stirred for 2-3 h in the nitrogen atmosphere, the stainless steel foil is taken out to be cleaned and cured for 3-4 h at the temperature of 120-125 DEG C, after the stainless steel foil is cooled to the room temperature, washing and nitrogen drying are conducted, and prefabricated stainless steel foil is obtained; and 2, the prefabricated stainless steel foil is soaked in the anti-oxidation conductive copper composite sol for 25-40 s, taken out, dried, coated with an aluminum grid, ground, soaked in the graphene / carbon nanotube composite sol for 20-30 s, taken out, dried for 4-6 min at the temperature of 100-120 DEG C, ground and dried, and the high-conductivity stainless steel foil is obtained.

The invention discloses pole piece processing equipment, and relates to the technical field of battery pole piece processing, and the pole piece processing equipment is characterized in that a conveying device conveys a pole piece material belt to pass through a cleaning position, a film covering position and a glue dispensing position in sequence; the laser assembly is arranged at the cleaning position and used for cleaning a pole piece material belt and forming a plurality of pole lug grooves, and each pole lug groove is provided with a dispensing forming area; the film covering device comprises a film supply assembly and an isolating film, the film supply assembly is arranged at the film covering position and used for providing the isolating film, the isolating film and the pole piece material belt move synchronously and are attached to the pole piece material belt, a plurality of through holes are formed in the isolating film, and the through holes are matched with the dispensing forming areas in a one-to-one correspondence mode; the glue dispensing mechanism is arranged at the glue dispensing position and used for spraying glue, the glue covers the glue dispensing forming area, at least part of the glue extends to the isolating membrane, and the glue is formed into a glue layer in the glue dispensing forming area. The pole piece processing equipment provided by the technical scheme of the invention can control the shape of the adhesive layer and improve the quality of the battery.

A battery manufacturing apparatus includes a negative electrode notching device configured to assign a first electrode ID to individual notched electrodes; a first cutting device for separating individual negative electrodes assigned the first electrode ID; a positive electrode notching device configured to assign a second electrode ID to individual notched electrodes; a second cutting device for separating individual positive electrodes assigned the second electrode ID; a stacking device configured to stack the individual positive electrodes and the individual negative electrodes with a separator therebetween; and a roll map creating device.

The invention relates to a method and equipment for improving pole piece wrinkles and a storage medium, and relates to the technical field of batteries, the method for improving pole piece wrinkles comprises the following steps: obtaining a group margin of a formed battery, and performing constant-current discharge on the formed battery to a discharge cut-off voltage; according to the group margin, dividing the charge state interval of 0-X into n sub-intervals; under the nth preset current I < n >, mn times of constant-current charging and discharging cycles are carried out in the nth sub-interval, the nth sub-interval is (SOC < n-1 >, SOC < n >], and SOC < n > is X. According to the method and the equipment for improving the wrinkles of the pole piece and the storage medium, the problem of easy wrinkles in the charging process of the battery cell pole piece can be improved, and the performance and the safety of the battery cell are improved.

Various embodiments of the teachings herein include an apparatus for hyperspectral imaging of electrode webs during electrode manufacturing for battery cells. An example includes: a hyperspectral spectroscopy unit with a line scan camera for imaging, the spectroscopy unit configured: to capture hyperspectral images of the forward-moving electrode web at a predefined location of the electrode manufacturing, to ascertain inhomogeneities of the electrode web from the images, wherein an inhomogeneity is a deviation of the chemical composition of the layers or of the particle size distribution from predefined target variables, and to ascertain and save a local position of the inhomogeneities in the longitudinal direction of the electrode web; and a deflection roll over which the electrode web is guided. The line scan camera captures the images at the position of the contact surface between the deflection roll and the electrode web.

The invention discloses an atomic layer deposition silicon-carbon composite material, a preparation method and application thereof, a core-shell coating structure composed of an inner core and an outer shell is adopted, the inner core is a multi-element doped silicon-carbon material, and the outer shell is a solid electrolyte composite layer; the mass ratio of the inner core to the shell is (80-95): (5-20); the solid electrolyte is deposited on the surface of the specific silicon carbon material through an atomic vapor deposition method, so that the expansion is reduced, and the cycle performance of the battery is improved.

The invention provides a composite lithium manganate positive electrode material, a preparation method thereof, a pole piece and a battery, and relates to the technical field of lithium batteries. The composite lithium manganate positive electrode material is of a core-shell structure; the core is lithium manganate, and the shell is a composite coating layer coating the surface of lithium manganate; the composite coating layer comprises a first coating layer and a second coating layer; the first coating layer is CuCe < x > Fe < 2-x > O < 4-y > Li; and the second coating layer comprises PVDF particles. The invention provides a lithium manganate material with a double-layer core-shell structure. The CuCexFe2-xO4-yLi inner layer reduces impedance and stabilizes crystal lattices by virtue of spinel isomorphism and doping, and anchors the PVDF outer layer based on oxygen vacancy; and in cooperation with the surface lithium gradient effect, the structural stability and electrochemical performance of the material are remarkably improved.

The invention discloses a positive plate with gradient pores, a preparation method of the positive plate, a lithium ion battery and an electric device. The positive plate comprises a plurality of coatings which are symmetrically coated on the two sides of a positive current collector, the porosity in the plurality of coatings is increased layer by layer from the coating close to the side of the current collector, and the average pore size of pores is increased layer by layer. The preparation method comprises the following steps: adding a self-sacrifice pore-forming agent into positive electrode slurry, uniformly mixing, coating a carbon-coated aluminum foil with the slurry, drying and rolling, enabling the self-sacrifice pore-forming agent to occupy a certain space, heating a positive electrode plate at a certain temperature, enabling the self-sacrifice pore-forming agent in the positive electrode plate to be decomposed into CO2 and H2O, forming corresponding pores, and forming the positive electrode plate with the pores. According to the invention, gradient gaps are designed on the electrode plate by utilizing the self-sacrifice pore-forming agent, so that the concentration polarization of the thick electrode is relieved, the reaction uniformity and the material utilization rate are improved, the ion transmission performance of the thick electrode is effectively improved, and the dynamic performance of the battery is further greatly improved.

The present application relates to a defective electrode sheet rejection method, a die cutting device, a winding device and a battery production system. The defective electrode sheet rejection method comprises the following steps: performing strip splicing trace detection on an electrode sheet material strip having a plurality of continuously distributed electrode sheet units; on the basis of detecting that the electrode sheet material strip has a strip splicing trace, marking two defect identifiers spaced apart by a first preset distance D1 at an upstream position of the strip splicing trace on the electrode sheet material strip; performing defect identifier detection on the electrode sheet material strip during the winding process thereof into an electrode assembly; and on the basis of detecting that the electrode sheet material strip has two defect identifiers, independently winding an electrode sheet unit having the defect identifiers and an adjacent electrode sheet unit located upstream of the electrode sheet unit having the defect identifiers. The defective electrode sheet rejection method in the present application can solve the problem in respect of relatively high loss in electrode sheet material strips, thereby reducing the production cost of batteries and lowering the defect rate of the batteries.

The invention provides a composite electrode for a solid-state battery, a preparation method of the composite electrode, a battery cell for the solid-state battery and the solid-state battery, and particularly relates to the technical field of solid-state batteries. The composite electrode for the solid-state battery comprises a current collector; the active material layer is arranged on at least one side surface of the current collector; the solid electrolyte layer is arranged on the surface of one side, far away from the current collector, of the outer side of the active material layer; the solid electrolyte layer extends outwards in the circumferential direction of the active material layer so as to form a coating structure around the active material layer; and the solid electrolyte layer at the coating structure is in direct contact with the current collector. According to the composite electrode, a solid electrolyte layer structure with edge supporting and insulating effects is formed around the active material layer, so that direct contact between the active material and the edge of the current collector is avoided, and local short circuit is prevented. In addition, the extended solid electrolyte layer can also be used as a physical barrier, so that side reaction of an electrode interface is reduced, the cycle life of the battery is remarkably prolonged, and the safety performance of the battery is remarkably improved.

The invention provides a method for preparing a high-voltage medium-nickel ternary positive electrode material by synergistic regeneration of a waste ternary lithium battery, which comprises the following steps: S1, taking a pretreated waste high-nickel and low-nickel ternary positive electrode material, calculating and supplementing a metal source and a lithium source according to the metal proportion of the actual content, and mixing the elements according to the total molar ratio of Li: (Ni + Co + Mn) = 1.0-1.1; s2, a composite fluxing agent containing lithium ion metal salt is added into the calibration mixture obtained in the S1, and two-stage sintering is carried out; and S3, coating the surface of the final product with a metal oxide aqueous solution corresponding to the lithium ion metal salt in the S2 as a coating agent to obtain the ternary positive electrode material. The nickel-rich characteristic of the high-nickel material and the manganese / cobalt-rich characteristic of the low-nickel material are utilized to form element complementation, so that the utilization rate of nickel, manganese and cobalt elements in the waste material is maximized, and the composition proportion limitation during regeneration of a single waste material is broken through.

The present invention provides a battery cell activation system comprising: a charging / discharging unit (100) for charging or discharging a first battery cell to a predetermined capacity or voltage; a voltage measurement unit (200) for measuring the voltage of the first battery cell a plurality of times for a predetermined time over a period including before and after voltage stabilization of the first battery cell, from a first charging / discharging time point at which the first battery cell has been charged or discharged to the predetermined capacity or voltage; and a stabilization time acquisition unit (300) including a voltage change rate acquisition unit (310) for acquiring change rates (dv / dt) of the voltage of the first battery cell over time on the basis of the measured voltage of the first battery cell, a reference change rate calculation unit (330) for calculating a reference change rate for at least partially distinguishing between the change rates before and after the voltage stabilization on the basis of the change rates of the voltage over time, and a stabilization time setting unit (340) for acquiring a reference time corresponding to the reference change rate and setting the reference time or a time similar to the reference time as a stabilization time (ST).

The invention relates to the technical field of lithium battery negative electrode materials, and discloses a preparation method of a lithium battery silicon-carbon composite negative electrode material with high cycle stability, and the preparation method comprises the following steps: carrying out magnesiothermic reduction and acid etching on micron silicon powder and magnesium powder to prepare porous silicon particles; growing carbon nanotubes on the surfaces of the porous silicon particles and in pore channels in situ to construct a three-dimensional conductive network; styrene butadiene rubber and glucose are adopted as a composite carbon source to coat the product, and a composite carbon layer is formed through drying and gradient carbonization; and finally grinding and sieving the carbonized product. According to the preparation method disclosed by the invention, pores are constructed in micron silicon, and the micron silicon is externally coated with the composite carbon layer with flexibility and rigidity, so that the volume expansion of silicon is effectively buffered; the in-situ grown carbon nanotube network provides a stable electron conduction path; the micron-sized substrate reduces the specific surface area of the material and improves the first coulombic efficiency. Therefore, the prepared negative electrode material has high cycling stability and excellent rate capability.

The present invention relates to: a composition for modifying the surface of an electrode active material for a secondary battery, wherein the composition comprises cellulose, modified cellulose, or a mixture thereof; an electrode active material for a secondary battery, wherein the electrode active material is coated with cellulose, modified cellulose, or a mixture thereof; and a secondary battery comprising same. According to the present invention, a dry electrode can be manufactured by excluding the use of a fluorine-based binder or reducing the amount of the used fluorine-based binder, and excellent dispersibility and adhesion are achieved without using a PTFE binder conventionally used as a dry electrode binder, thereby enabling the production of a high-capacity thick film electrode.

The utility model provides a button cell. The button cell comprises a first shell, a second shell, a diaphragm and a second pole piece, the first shell comprises a conducting layer and an insulating layer, a first mounting groove is formed in the middle of the first shell, and the surface of the conducting layer is coated with an active material layer within the range of the first mounting groove; a second mounting groove is formed in the middle of the second shell; the edges of the first shell and the second shell are hermetically connected to form a mounting cavity, at least parts of the first tab and the second tab are exposed out of the mounting cavity, and the diaphragm and the second pole piece are arranged in the mounting cavity. The active material layer is arranged on the surface of the conductive layer of the first shell, so that the problems of non-uniform thickness of the pole piece and falling of the active material layer caused by rolling of the active material layer coated on the pole piece are avoided, the problem of large gram capacity fluctuation is avoided, the gram capacity is more stable, and the battery performance is effectively improved.

The invention discloses a pole piece die cutting defect online detection and sorting control method and system, particularly relates to the technical field of pole piece die cutting online detection and sorting control, and is used for solving the problems of uncertain event positioning and sorting errors caused by time base asynchronization, coordinate mapping drifting and late disorder under a multi-station dynamic beat condition. A double-anchor time base and an idempotent key are established, water line propulsion and out-of-order window playback are taken as an order basis under a unified time axis, online self-certification of same-layer coordinate transformation and time check and space check in a topological graph are matched, unified judgment is implemented at the merging moment, and two-section interlocking execution is performed. Therefore, under the multi-station dynamic rhythm, a determined and reviewable sheet-level corresponding relation is established between the detection event and the stroke frequency, the mold cavity and the discharging port, the consistency of sorting decisions is still kept in the face of late, disorder and state transition, and the risk of wrong sorting and missing sorting is reduced.

The invention belongs to the field of electrochemistry, and discloses a positive electrode material V2O3 / C of a rechargeable aqueous zinc ion battery, an electrode plate of the positive electrode material V2O3 / C and a preparation method of the positive electrode material V2O3 / C. A carbon-coated vanadium trioxide nano material is obtained by adopting hydrothermal synthesis and calcination and is applied to a positive electrode of the rechargeable aqueous zinc ion battery. The material is simple and convenient to synthesize and low in cost, and shows relatively high specific capacity and excellent rate capability and cycling stability when being used as a zinc ion battery positive electrode material, so that the selection of water system energy storage battery materials is more diversified.

The invention discloses a pole piece, an electrode assembly, a battery monomer and a preparation method thereof, a battery and a power utilization device, and belongs to the technical field of batteries. A protective layer is arranged on the surface of at least the end part of the pole piece and comprises silicon oxide; based on the total mass of all the elements at the first position of the pole piece, the mass content A of the Si element meets the following formula: Alt; and 0.01 wt%, the first position being a position 5 mm away from the end surface. According to the technical scheme, the reliability and the cycle performance of the battery monomer can be improved.

The application belongs to the technical field of lithium ion batteries, and relates to a solid-state electrolyte interface layer for a lithium metal negative electrode and an in-situ plasma construction method and application thereof. The core of the method is to use an organic-inorganic-alloy component precursor as a plasma reaction source, to control the mixing ratio and reaction conditions to perform plasma reaction on the surface of lithium metal, and to in-situ construct a unique gradient layered structure of an organic-inorganic-alloy composite artificial solid-state electrolyte interface layer. The outer layer of the solid-state electrolyte interface layer is a flexible organic phase, the middle layer is a rigid inorganic fast ion conductor, and the inner layer is a lithiumophilic alloy phase, which can synergistically inhibit lithium dendrite growth and significantly improve the interface stability of the lithium metal negative electrode. Meanwhile, the preparation method provided by the application is simple, rapid, efficient, environmentally friendly, mild in conditions and easy to control, significantly improves the cycle stability and coulombic efficiency of the lithium metal negative electrode, and is helpful to promote the development of high-energy-density lithium metal batteries.

Example embodiments provide a battery manufacturing system. The battery manufacturing system includes a coupling device configured to form a plurality of first electrodes including an electrode identifier (ID) from a first electrode sheet to which the electrode ID is allocated at intervals of a pitch, form a plurality of second electrodes from a second electrode sheet, and combine the plurality of first electrodes and the plurality of second electrodes, in which the coupling device includes a controller configured to collect coordinate-related electrode ID data including the electrode ID and at least one of a coordinate of a first electrode sheet and a coordinate of a second electrode that match the electrode ID, based on a first input amount of the first electrode sheet, a second input amount of the second electrode sheet, and an electrode ID sensing signal.