1180 results about "Cell material" patented technology

The invention belongs to the technical field of battery materials, and particularly relates to a method for preparing a porous carbon structure containing a sub-nanoscale ionic conduction improvement layer by utilizing atomic layer deposition and application. The invention discloses a porous carbon-silicon negative electrode structure, which is characterized in that a sub-nano-scale ion conduction improvement layer is added between a porous carbon substrate and silicon particles, and the sub-nano-scale ion conduction improvement layer comprises silicon carbide, aluminum phosphide, aluminum nitride, aluminum oxide, lithium phosphate, aluminum phosphate and lithium aluminum phosphate. Meanwhile, the invention also discloses a preparation method of the porous carbon-silicon negative electrode structure, namely, a sub-nano-scale ion conduction improvement layer is deposited on the porous carbon substrate through an atomic layer deposition method, so that the binding force between the sub-nano-scale ion conduction improvement layer and silicon particles and an ion transport channel are increased, and the ion conduction of a vapor deposition silicon-carbon negative electrode material is improved; the polarization of the material is effectively reduced, so that the rate capability of the battery is improved, and the cycling stability of the porous carbon structure battery is improved.

The invention relates to a spinel multi-objective reverse design method based on machine learning and a Bayesian optimization algorithm, electronic equipment and a storage medium, and the design method comprises the steps: firstly extracting related data of a spinel material from a database, and constructing a balanced data set through preprocessing; feature engineering is carried out, a comprehensive feature set is constructed, and key features are reserved; then training a multi-target prediction model through hyper-parameter optimization by using a multi-task gradient elevator model; and finally, integrating to a Bayesian reverse design framework, expanding a design space through a specific encoder, and combining a Gaussian process proxy function and an expected hyper-volume improvement criterion to screen candidate materials meeting conditions and verify performance, thereby completing reverse design optimization. Compared with the prior art, the intelligent and efficient spinel novel multi-target reverse design method can be used for solving the problem of data scarcity, and development of high-performance spinel solar cell materials is accelerated.

The invention provides a silicon-carbon material and a preparation method thereof, a porous carbon substrate, a negative electrode material and a battery, and relates to the technical field of battery materials. The core point provided by the invention is controllable synthesis of the porous carbon substrate in the silicon-carbon material, a phenolic monomer and an aldehyde monomer are polymerized in the presence of a catalyst and a dispersing agent, meanwhile, a doping agent and a pre-carbonized biomass carbon precursor are added into a solution, the phenolic resin formed by polymerization is of a spherical structure, and the silicon-carbon composite material is obtained. Homogeneous doping of elements is completed in the synthesis process, the added biomass carbon precursor is of a blocky structure, matching of carbon-based particles of different structures can better exert respective beneficial effects and complement each other, the battery performance is comprehensively improved, and the battery has excellent cycle performance and conductivity.

The invention relates to the technical field of lithium ion battery silicon-carbon coating, in particular to a silicon-carbon composite material, a silicon-carbon negative electrode material, a preparation method of the silicon-carbon negative electrode material and a battery. The preparation method of the silicon-carbon composite material comprises the following steps: S1, mixing porous carbon and a gaseous organic silicon source for reaction under the conditions of 450-550 DEG C and 100-200 kPa; s2, under the condition of 500-800 DEG C, carrying out carbon coating on the product obtained in the step S1 by using a carbon source to obtain a silicon-carbon composite material; the flow velocity of the gaseous organic silicon source is 12-30L / min. The silicon-carbon composite material provided by the invention has good conductivity, and the subsequently prepared silicon-carbon negative electrode material and battery material have good electrochemical performance.

The invention discloses a porous carbon material, a preparation method thereof and a battery, and belongs to the field of battery materials. The particle size D50 of the porous carbon material is 4-25 [mu] m, the specific surface area measured by a multi-point BET method is 1000-2500m < 2 > / g, and the total pore volume is 0.5-1.2 cm < 3 > / g. The porous carbon material has the particle size, the specific surface area and the total pore volume in the range, has good structural stability, is beneficial to silicon deposition, improves the structural stability of the silicon-carbon negative electrode material after silicon deposition, and improves the capacity and the cycle performance.

The present application belongs to the technical field of battery materials. Disclosed are a doped iron (III) phosphate, a method for preparing same, and use thereof. The chemical formula of the doped iron (III) phosphate is (MnxFe1−x)@FePO4·2H2O, wherein 0<x<1. According to the present application, ferromanganese phosphate is used as a template agent for preparing the doped iron (III) phosphate. The doped iron (III) phosphate is regular in morphology and good in fluidity, facilitates washing and conveying, and can improve the electrochemical performance of the subsequently prepared LiFePO4 / C. When the doping amount of Mn is 11000 ppm, the specific discharge capacity of LiFePO4 / C at room temperature at 0.1 C rate can reach 165 mAh / g; the retention rate of the discharge capacity of 1000 cycles at 45° C. at 1 C rate can reach 97.4%; and at a low temperature of −15° C. the specific discharge capacity at 0.1 C rate is still 134 mAh / g.

The invention provides a lithium iron phosphate positive electrode material and a preparation method thereof, a positive electrode plate and a secondary battery, and belongs to the field of battery materials, the average particle size of primary particles of the lithium iron phosphate positive electrode material is 250-330 nm, and the lithium iron phosphate positive electrode material comprises first particles and second particles; the particle size of the first particles is less than or equal to 200nm, and the number ratio of the first particles is 35-45%; the second particles meet the following conditions: the particle size is greater than or equal to 1 mu m, and the quantity ratio is 1-5%; the second particle has a columnar structure, and the ratio of the length to the width of the columnar structure is (1.7-6): 1. According to the invention, the lithium iron phosphate positive electrode material with high compaction density and excellent discharge performance can be obtained.

The invention belongs to the field of battery materials, and discloses a high-entropy high-nickel positive electrode material which comprises a base material LiNixCoyMzO2, a base further comprises a lithium-site doping element and a nickel-site doping element, the surface of the base is coated with an island-shaped coating layer, and the island-shaped coating layer is a nano metal oxide layer. The preparation method comprises the following steps: uniformly mixing a high-nickel hydroxide precursor, a lithium source, a compound containing an element A and a compound containing an element B, carrying out two-stage sintering, mixing with a metal oxide containing an element C and a metal oxide containing an element D, and sintering to obtain the high-entropy high-nickel positive electrode material. Lithium doping in a bulk phase of the high-entropy high-nickel positive electrode material can improve the electronic conductivity of a single crystal material, increase the interlayer spacing of transition metal and inhibit lithium and nickel positive ions from being mixed, and nickel doping can improve the structural stability and thermal stability of the material, inhibit irreversible phase change of H2-H3 and stabilize lattice oxygen of the material; the doping modification of the two sites further improves the performance of the material.

The invention provides a solid-state battery performance testing method and system, and relates to the technical field of battery performance testing. According to the method, pressure is applied to the solid-state battery, the pressure value is gradually changed, in-situ CT imaging detection and electrochemical performance detection are carried out on the solid-state battery in the pressure change process, and coupling analysis is carried out on the pressure value, CT image information and electrochemical parameters; the mutual relation and evolution rule among the pressure value, the CT image information and the electrochemical parameters are summarized, so that the comprehensive performance characterization of the battery under different pressure conditions is realized, and more comprehensive and accurate data support is provided for deeply understanding the performance evolution of the battery in the actual use process; the internal relation between the internal structure change of the battery and the electrochemical performance can be disclosed, and an important theoretical basis and a guidance direction are provided for the optimization design of a battery material and the improvement of the battery performance.

The invention relates to the technical field of battery materials, and discloses an O2-phase lithium cobalt oxide positive electrode material, a preparation method thereof, a positive electrode and a battery. The chemical formula of the O2-phase lithium cobalt oxide positive electrode material is LiaNabCocMdAeO2-fXf, M and / or A are selected from any one or more of Mg, Al, W, Ti, La, Zr, Y, Ni, Mn, K and Te, a is larger than or equal to 0.9 and smaller than or equal to 1, b is larger than or equal to 0 and smaller than or equal to 0.01, c is larger than or equal to 0.95 and smaller than or equal to 1, d is larger than or equal to 0 and smaller than or equal to 0.05, e is larger than or equal to 0 and smaller than or equal to 0.01, and f is larger than or equal to 0 and smaller than or equal to 0.01. Under the synergistic effect of the doped and coated elements (M and A elements), the positive electrode material not only can reduce the existence of polycrystals and twin crystals, improve the interlayer spacing, reduce the content of residual Na and stabilize the bulk phase structure, but also can improve the stability of an interface and inhibit the generation of side reactions of the interface.

The invention provides a three-junction quantum well solar cell epitaxial structure and a manufacturing method thereof, the three-junction quantum well solar cell epitaxial structure comprises a substrate serving as a first sub-cell, a first tunnel junction, a second sub-cell, a second tunnel junction and a third sub-cell which are sequentially stacked from bottom to top, and the three sub-cells are connected through the tunnel junctions; wherein the first sub-cell is a Ge cell, the second sub-cell is an InGaAs cell, the third sub-cell is a GaInP / AlGaInP quantum well cell, the third sub-cell comprises a (Al < x > 1 < Ga < 1-x > 1 < y > 1 < In < 1-y > 1 < P) back field layer, a quantum well base region, a (Al < x > 4 < Ga < 1-x > 4 < y > 4 < In < 1-y > 4 < P) emitter region and an Al < x > 5 < In < 1-y > 5 window layer which are sequentially stacked from bottom to top, the quantum well base region is composed of a Ga < x > 2 < In < 1-x > 2 layer and a (Al < x > 3 < Ga < 1-x > 3 < y > 3 < In < 1 x is larger than or equal to 0.5 and smaller than or equal to 0.8, y is larger than or equal to 0.5 and smaller than or equal to 0.8, y is equal to 0.5, the GaInP / AlGaInP quantum well structure is used for replacing a traditional AlGaInP material to serve as a top cell material, the open-circuit voltage of the solar cell is increased, and meanwhile the defect that the short-circuit current of the AlGaInP / GaAs / Ge solar cell is insufficient is overcome.

The invention provides a surface modified carbon fiber as well as a preparation method and application thereof, and belongs to the technical field of battery materials. Physical or chemical treatment on the surface of the carbon fiber is realized by performing one or more of accurate plasma treatment, chemical etching, coupling agent treatment and nano particle deposition on the surface of the carbon fiber, so that functional groups are introduced or a rough nano structure is formed; a functional layer with a specific functional group and a rough structure which are beneficial to attachment of positive electrode material slurry are formed on the surface of the carbon fiber, and then a stable and well-attached surface modified layer is obtained through heat treatment, so that the surface modified carbon fiber is prepared. According to the method disclosed by the invention, the surface roughness and the functional group richness can be improved on the premise that the mechanical property of the fiber is not obviously damaged, so that the adhesiveness and the electrical property of the positive electrode material slurry are enhanced, and a foundation is laid for the preparation of a carbon fiber positive electrode material and a structure-energy storage integrated composite structure.

The invention discloses a method for preparing high-quality iron phosphate in a short process, and belongs to the field of battery material manufacturing. The method comprises the following steps: dissolving iron powder with phosphoric acid to prepare a ferrous phosphate solution, then transferring the solution into a pressurized reaction kettle, blowing high-speed oxygen to oxidize ferrous phosphate into ferric phosphate, adding ammonia water to control the pH value to be 1.5-2.0, and carrying out solid-liquid separation to obtain the water-containing amorphous ferric phosphate, after washing is finished, a water-containing material is fed into a muffle furnace to be subjected to stepped calcination, dehydration and crystal transformation are completed, and the alpha monoclinic system iron phosphate is obtained. The method provided by the invention is short in process flow and low in energy consumption, the oxidant is easy to obtain and safe, the particle size uniformity of reaction materials is good, and the prepared iron phosphate is uniform in particle size, regular in structure and stable in iron-phosphorus ratio and is a high-quality precursor material.

The invention belongs to the technical field of battery material preparation, and particularly relates to a coated negative electrode material as well as a preparation method and application thereof. The coated negative electrode material comprises a porous carbon skeleton and a carbon coating layer coating the porous carbon skeleton, the porous carbon skeleton is provided with a plurality of holes; a silicon layer and a functional layer are attached to the surfaces of part of the holes; the silicon layer comprises silicon, the functional layer comprises a functional material, and the functional material comprises lithium aluminum fluoride. The coated negative electrode material provided by the invention has the properties of low expansion, high lithium ion conduction, few byproducts and the like, and is suitable for a solid battery; the battery energy density is ensured, and the problems that an effective lithium ion path cannot be formed due to contact failure of an active substance caused by high volume expansion of a silicon-based material in the circulation process and contact failure of the active material and a solid electrolyte in a solid-state battery, and performance degradation is caused by negative electrode side polarization increase in the circulation process are solved.

The invention relates to the technical field of batteries, in particular to a material mixing uniformity determination method and a material mixing uniformity detection system.The material mixing uniformity detection system is provided with a dispersion system, a robot and imaging equipment, so that a sample dispersion image of a battery material can be obtained on line in the production process of the battery material; further utilizing computer equipment to perform feature extraction on the acquired dispersed image of the sample to obtain an image feature set, then inputting the image feature set into the trained neural network model to obtain particle features of the dispersed image, and finally obtaining the uniformity of the sample according to the particle features. Therefore, the mixing uniformity can be detected on line in the production process of the battery material, and the production efficiency is improved.

The invention discloses a topological optimization method and device for a continuous fiber periodic unit cell structure, and relates to the technical field of continuous fiber reinforced composite 3D printing. Determining the configuration of the selected periodic unit cell structure; constructing a feature component in a design domain of a periodic unit cell, performing projection on a fiber angle to calculate an elastic matrix, and determining a weight coefficient in an overlapping region based on a component level set function so as to solve an equivalent elastic matrix; solving the equivalent elastic property of the periodic unit cells of the fiber reinforced composite material; constructing a unit constitutive matrix in an interpolation format; constructing a periodic unit cell structure topological optimization model by taking the flexibility as a target function; calculating the derivative of the flexibility about the design variable formed by the artificial density of the alternative unit cell material, and carrying out sensitivity filtering treatment; optimization iterative analysis is carried out under different working conditions, and the convergence degree of an optimization result is evaluated by using an inequality relation. The problem of how to further improve the mechanical performance of the periodic unit cell structure is solved.

The invention provides a silicon carbon material with a multilayer coating structure and a preparation method and application thereof, and relates to the technical field of battery materials. The silicon-carbon material with the multi-layer coating structure comprises a porous carbon core body, and a first carbon layer and a second carbon layer which sequentially coat the porous carbon core body from inside to outside, and the porous carbon core body comprises porous carbon and nano silicon particles deposited on the surface and in pore channels of the porous carbon; and a conductive nano carbon filler is dispersed in the second carbon layer. The silicon carbon material with the multilayer coating structure provided by the invention is used as a lithium ion battery negative electrode material, and has excellent specific capacity, coulombic efficiency and cycle performance. The result of the embodiment shows that when the silicon carbon material with the multi-layer coating structure is applied to the lithium ion battery, the first reversible capacity is 1882-2071 mAh / g, the first coulombic efficiency is 92.6-94.1%, and the capacity retention ratio of 100 cycles is 95.3-97.7%.

The present invention relates to the field of battery materials, and provides a lithium manganate cathode material coated with lithium triborate and a preparation method thereof. The cathode material is a porous lithium manganate / lithium triborate composite electrode material, which includes porous lithium manganate with a highly connected directional columnar pore structure and a lithium triborate coating covering the pore surface, with a mass ratio of (86.0~92.0):(8.0~14.0), a coating thickness of 600~800 nm, a pore diameter of 45~95 μm, and a porosity of 65~78%. The preparation method includes: preparing a precursor colloidal solution by the sol-gel method, obtaining porous lithium manganate through low-temperature freezing molding and freeze-drying, and forming a cathode substrate through pre-oxidation and high-temperature sintering; subsequently, using vacuum-assisted impregnation, ultrasound, and nitrogen pressure to promote the penetration of the lithium triborate precursor solution, and forming a uniform coating layer through gradient drying and annealing treatment. The present invention significantly improves the crystal structure stability of the cathode material, inhibits manganese dissolution, improves the cycle life and rate performance, and has wide application value.

Apparatus and associated methods relate to separate ferromagnetic impurities from bulk battery materials. In an illustrative example, a ferromagnetic impurity separation system (FISS) may receive a sample vessel including an enclosed sample of bulk battery materials. The FISS, for example, may include a variable magnetic flux generator (e.g., an electromagnet) disposed at a position separated from the sample vessel. The FISS may also include an agitation unit having a translational motor and a rotational motor configured to rotate the sample vessel about a central axis, and to translate a position of the central axis of the sample vessel. For example, in an operation mode, the variable magnetic flux generator and the agitation unit may apply a predetermined magnetic flux, a predetermined angular velocity and a predetermined velocity to the sample vessel. Various embodiments may advantageously separate ferromagnetic impurities from the enclosed sample concisely without contaminating the sample.

The invention belongs to the field of battery materials, and discloses a PEO-based composite solid electrolyte and a preparation method and application thereof, the PEO-based composite solid electrolyte comprises double transition metal-based pyrophosphate, PEO and an electrolyte lithium salt; wherein the molecular formula of the double transition metal-based pyrophosphate is MaNb (P2O7) c, M is any one or two of Fe and V, N is any one or two of Pb and Cd, a is greater than or equal to 1 and less than or equal to 2, b is greater than or equal to 1 and less than or equal to 5, and c is greater than or equal to 1 and less than or equal to 4. By applying the double-transition-metal-based pyrophosphate to the solid electrolyte, the suitability of the solid electrolyte and a positive electrode material with the charging cut-off voltage of 4V or above is improved, and the application range of the solid electrolyte in a battery system with high energy density and long cycle life and a functional energy storage device is widened; and the electrochemical capacity, the structural stability and the ionic conductivity of the battery can be improved.

The present invention belongs to the technical field of battery materials, and particularly relates to a composite phosphate-based positive electrode material, and a preparation method therefor and the use thereof. The composite phosphate-based positive electrode material comprises a phosphate-based active core, wherein the outer surface of the phosphate-based active core is sequentially coated with a carbon coating layer, a nitrogen-doped carbon coating layer and a nitrogen-phosphorus co-doped carbon coating layer from inside to outside, wherein the carbon coating layer can improve the electronic and ionic conductivity of the composite positive electrode material, and optimize the particle size and morphology of the composite positive electrode material. The nitrogen-doped carbon coating layer improves the consistency and integrity of coating; and nitrogen-atom-doped carbon further enhances the electronic conductivity and lithium-ion diffusion of the carbon coating layer. Electron-rich clouds of P and N atoms in the nitrogen-phosphorus co-doped carbon coating layer can provide a rich conductive network, mutual contact is formed among different particles to form a series network, thus promoting the interfacial electron transport of the composite material during a charging and discharging process, and improving the cycling and rate performance of the composite phosphate-based positive electrode material during the charging and discharging process.

The invention relates to the technical field of battery materials, in particular to a sodium-ion battery positive electrode material with a high-entropy superlattice structure and a preparation method of the sodium-ion battery positive electrode material, and the general formula of the sodium-ion battery positive electrode material is Na < 0.67 > MnaNibFecLidCueTifO2, a < lt >; 0.6, 0.1 lt; blt; 0.3, 0.01 lt, 0.01 lt, 0.01 lt; clt; ct; 0, 0.2, 0.03 lt; dlt; 0, 0.2, 0.03 lt; lt, lt; 0.2, 0.01 lt, 0.01 lt, 0.01 lt; flt; 0.2, a + b + c + d + e + f = 1; according to the invention, a plurality of ions with similar sizes are introduced into the sodium ion layered oxide transition metal layer, so that a short-range disordered honeycomb-shaped high-entropy superlattice structure is formed; by means of the hysteresis diffusion effect of the high-entropy material, the oxidation-reduction reaction of oxygen anions activated by lithium is effectively regulated and controlled, and the phenomena of voltage decline and structure degradation caused by the migration process of manganese ions in the transition metal layer are inhibited.

The invention relates to a method for producing a dried fibrous web (36), in particular a paper, cardboard or tissue web, from baled pulp comprising a plurality of stacked pulp sheets, comprising the following steps: feeding the baled pulp into a shredder (16) to produce chips (20) from the fed baled pulp; feeding the chips (20) to a fiberizing device (32) to fiber the chips (20) in a dry process; and feeding the fibers into an air laying unit (34) to form a dried fibrous web (36) from the fibers; wherein the shredder (16) is designed and operated such that at least 50% of the chips (20) produced therein have essentially the shape of an irregular polygon, with a weight-to-circumference ratio between 5.0 g / m² and 10 g / m².Furthermore, the invention relates to a device for carrying out the method according to the invention.

The invention provides a reverse particle size analysis method and system for a lithium ion battery, and the method comprises the steps: carrying out the detailed disassembly, cleaning, adhesion, stripping and high-temperature treatment of a to-be-analyzed cell, can accurately analyze the particle size distribution of an electrode active material in the positive and negative electrode materials of the lithium ion battery, guarantees the purity and activity of the electrode active material, and improves the detection accuracy. Therefore, the particle size analysis result is more accurate and reliable. According to the invention, the performance of the battery material is optimized, the safety of the battery is improved, the service life of the battery is prolonged, and important data support is provided for research, development and improvement of the battery material.

The invention provides a deviation rectification prediction method and device for the tail of a battery core material head and electronic equipment. The deviation rectification prediction method comprises the steps that the current initial offset of a to-be-predicted position on a material line of the tail of a target battery core head relative to a preset reference position before winding is started is collected; obtaining a historical initial offset of a to-be-predicted position on a historical battery cell stock line relative to a preset reference position before winding is started, a corresponding historical deviation correction amount after winding is finished and an actual offset of the historical stock line; determining a target deviation correction influence coefficient according to the current initial offset and the historical initial offset; and the target deviation correction influence coefficient acts on the historical deviation correction amount and the actual offset of the historical stockline, and the predicted offset of the to-be-predicted position on the target stockline is determined. The stockline deviation value can be obtained through a prediction algorithm before winding is started, the deviation correction mechanism is driven to complete prediction compensation in advance, error accumulation caused by lagging response afterwards is avoided, and interference caused by error drift and inaccurate calibration of equipment is eliminated.

The present invention relates to the field of battery material technology, and in particular to a method for regulating biomass-based hard carbon microstructure by vapor deposition, biomass-based hard carbon negative electrode material and application, the method comprising the steps of: pre-oxidizing the biomass-based fruit shell, heat-treating the pre-oxidized fruit shell under an inert atmosphere containing organic molecules to obtain a hard carbon material precursor; and finally carbonizing the hard carbon material precursor. By using an inert gas as a carrier gas to mix gaseous organic molecules, the atmosphere of high-temperature sintering hard carbon is changed, and the organic molecules are deposited on the surface of the hard carbon precursor, so that the lignin-rich fruit shell biomass base can controllably form a relatively ordered surface structure during the carbonization process, and the surface defects of the hard carbon are modified to obtain a biomass-based hard carbon negative electrode active material, so that the solid electrolyte interface generated by contact with the electrolyte during the charge and discharge process is thinner and chemically stable, and the first-cycle coulomb efficiency is improved while maintaining high capacity.

The invention relates to the field of organic photovoltaic cell materials, in particular to an organic compound containing cyano-substituted 1, 3-indandione. The organic compound containing cyano-substituted 1, 3-indandione provided by the invention is used as an acceptor material to be matched with a proper donor material to be applied to an organic photovoltaic cell, and the photoelectric property of the organic photovoltaic cell can be improved.

The invention discloses a negative plate, a preparation method thereof and a solid-state battery, and relates to the technical field of battery materials. The disclosed negative plate comprises a current collector, and a bottom layer with the thickness of 10-50 [mu] m, a middle layer with the thickness of 10-50 [mu] m and a surface layer with the thickness of 10-50 [mu] m which are sequentially arranged on the surface of the current collector, the bottom layer comprises the following components in percentage by mass: 1-30% of small-particle-size solid electrolyte and 0.5-3 microns of D50; the component of the middle layer comprises medium-particle-size solid electrolyte, the mass ratio of the medium-particle-size solid electrolyte is 5-30%, and D50 is 3-5 [mu] m; the component of the surface layer comprises a large-particle-size solid electrolyte, the mass ratio of the large-particle-size solid electrolyte is 5-30%, and D50 is 5-10 [mu] m. Compared with a common negative plate, the negative plate provided by the invention optimizes the ion transmission path, relieves the interface stress and improves the electrochemical performance.

The invention provides a battery management method and device, a vehicle and electronic equipment, and relates to the technical field of batteries, and the main technical scheme comprises the steps: obtaining the current battery charge state of a target battery; when it is determined that the current state of charge of the battery exceeds a preset state threshold value, the standing time of the target battery maintained in the current state of charge of the battery is obtained; and when it is determined that the standing time exceeds a preset time threshold value, controlling the target battery to perform automatic discharging. Compared with the prior art, according to the embodiment of the invention, the SOC state of the target battery and the storage time of the target battery in the high SOC state are automatically reduced by judging the current battery charge state and the standing time of the current battery charge state, so that the side reaction of the electrolyte and the positive electrode material and the phase change degree of the battery material are reduced; and the cycle life of the target battery is prolonged.

The invention belongs to the technical field of battery materials, and particularly relates to a ternary positive electrode material and a preparation method and application thereof.The preparation method of the ternary positive electrode material comprises the following steps that 1, a nickel source, a cobalt source, a manganese source and a lithium source are mixed according to the molar ratio of Li: Ni: Co: Mn = x: a: z: c and then subjected to first-time calcination, and a first-time sintered material is obtained; (2) a lithium source and a cobalt source are supplemented on the basis of the primary sintered material, so that the total molar ratio of Li to Ni to Co to Mn is y: a: b: c, a fluxing agent is added, mixing is performed, secondary calcination is performed, a secondary sintered material is obtained, 0.5 < = a < = 0.95, 0.01 < = b < = 0.3, 0.03 < = c < = 0.3, 0.8 < = x < = 1.15, 0 < = z < = 0.3, 1.0 < = y < = 1.5, z < = b, and x < = y; and (3) mixing the coating additive with the secondary sintered material, and performing third calcination to obtain the ternary positive electrode material.