49results about How to "Improve fast charging performance" patented technology

This invention proposes a lithium-ion battery electrolyte and its application. The electrolyte comprises at least the following components: a fluorinated solvent, including 2,2-difluoroethyl acetate, fluoroethylene carbonate, and 2,2-difluoroethyl ethyl carbonate; a lithium salt, including a first lithium salt comprising lithium hexafluorophosphate; and an additive, including a first additive comprising lithium difluorobis(oxalato)phosphate. The lithium-ion battery electrolyte and its application proposed in this invention can improve the electrolyte's high-voltage resistance and kinetic performance, reduce battery impedance, and enhance the battery's fast-charging performance and high-temperature cycle stability.

The present invention relates to the technical field of power batteries, and provides a battery cell cover plate, a cover plate assembly and a battery cell, the battery cell cover plate comprises: a cover plate body having two plate surfaces arranged back to back in the thickness direction of the cover plate body, one of the plate surfaces forming a support surface; the pole hole penetrates through the cover plate body; the supporting convex hull is arranged on the supporting surface in a protruding mode, and the height H1 of the supporting convex hull protruding out of the supporting surface meets the condition that H1 is larger than or equal to (H + 1.0 mm) and smaller than or equal to (H + 2.0 mm); wherein H is the height of the pole protruding out of the supporting surface. When the upper surface of the whole battery pack is impacted by external force, the impact force can be borne by the supporting convex hulls, direct stress of the pole columns is avoided, the short-circuit risk of the battery cell is reduced, the impact external force borne by the supporting convex hulls can be directly dispersed to the cover plate body and even the whole shell of the battery cell, the supporting performance of the shell of the battery cell is exerted, and the mechanical strength of the whole battery pack is improved; and long-term stable operation of the battery cell is ensured. And the supporting convex hulls can also improve the heat dissipation effect of the battery cell and improve the quick charging performance of the battery cell.

The invention relates to a cobalt-free ultra-high nickel positive electrode material and a preparation method and application thereof, the preparation method comprises the following steps: ball-milling and mixing a nickel source, a lithium source and a dopant to obtain powder, and drying and sintering the obtained powder to obtain the cobalt-free ultra-high nickel positive electrode material, the doping agent comprises an aluminum-containing doping agent and a manganese-containing doping agent; the nickel source, the lithium source and the doping agent are mixed according to the molar ratio of the nickel element to the lithium element to the total doping element being (0.90-0.98): (1.03-1.06): (0.02-0.10). The Al and Mn elements are uniformly doped in the positive electrode material substrate through a solid-phase reaction method, the material performance is synergistically improved by utilizing the unique action mechanism of the doped elements, the electrochemical performance is synergistically improved on the premise of not depending on the cobalt element, and high initial discharge capacity, cycling stability and rate capability are kept in a wide voltage interval; and excellent capacity retention capability is shown in a wide multiplying power range.

The utility model discloses plastic material production equipment, relates to the technical field of positive and negative electrode material preparation equipment, and aims to solve the problem of structural regulation and control of the conventional positive and negative electrode material preparation. Comprising a box body and a cylinder body, the box body is communicated with the cylinder body through an adapter, and heating assemblies for heating the interiors of the box body and the cylinder body are arranged on the box body and the cylinder body; a feeding port communicated with the interior of the box body is formed in the box body, a conveying belt is further arranged in the box body, the conveying belt is driven by a conveying motor, a roller column is further arranged in the box body, the roller column is of a composite structure, and the roller column is arranged above the conveying belt and rolls materials on the conveying belt. The two ends of the cylinder body are rotationally connected with the adapter and the discharging port respectively, the cylinder body is driven by the driving mechanism, the discharging port is formed in the supporting seat, and an inner wall threaded groove is formed in the inner wall of the cylinder body. And meanwhile, the productivity is also improved.

The utility model provides a battery capable of reducing internal resistance and a battery pack, which belong to the technical field of batteries, and comprise: a housing comprising a main housing and a cover plate, the cover plate is covered on the main housing, and the cover plate is provided with a first opening; the battery cell is arranged in the main shell, the battery cell is provided with a first tab, and the first tab is a negative tab; the first pole guide assembly is arranged in the main shell, one end of the first pole guide assembly is electrically connected with the first pole lug, the other end of the first pole guide assembly extends out of the shell from the first opening, and the surface, extending out of the shell, of the first pole guide assembly is a first pole connecting surface. The battery has the beneficial effects that one end of the first pole diversion assembly is electrically connected with the negative tab, and the other end of the first pole diversion assembly extends out of the shell from the first opening and extends out of the surface to serve as a first pole connecting surface, so that the winding core current can be directly guided out through the first pole diversion assembly, and the main shell and the cover plate with relatively high resistivity are prevented from participating in the diversion process; the ohmic internal resistance of the whole battery cell is reduced, so that the fast charging performance of the battery is improved.

The invention provides a pole piece of a lithium ion battery and a preparation method of the pole piece, the pole piece of the lithium ion battery comprises a current collector and an active material coated on the current collector, and by arranging the active material and an adhesive, the active material can be conveniently and rapidly fixed when being extruded and arranged on the current collector along an angle; the assembly state of the active material on the current collector is stabilized, the active material is placed in the slit die cavity to be extruded, the active material moves and deforms towards the single side direction, so that the structure becomes long and narrow, and the end part of the long and narrow active material is connected with the current collector to be rolled, so that the tortuosity of the lithium ion battery pole piece is reduced, and the service life of the lithium ion battery pole piece is prolonged. And the migration rate of lithium ions in the pole piece and the embedding rate of the lithium ions in the active material are accelerated, meanwhile, the problem that the pole piece is expanded and increased due to lithium ion embedding in the thickness direction of the pole piece is solved, and the probability of deformation of the lithium ion battery is reduced.

The application provides a battery fast charging protection method and device based on reverse current detection and electronic equipment, and belongs to the technical field of battery management. The method comprises the following steps: acquiring current direction information of a charging current flowing through an internal battery of the electronic equipment; determining that the current direction information represents a reverse current state from the battery to a charger; in response to the determination of the reverse current state, generating and outputting a discharge control signal based on parameter information of the reverse current state; controlling a power switch circuit connected to the battery to apply a controllable discharge current pulse to the battery according to the discharge control signal; and through real-time monitoring and response to the harmful reverse current generated by the battery, precise and adaptive protection intervention is realized, so that the average current of the fast charging process is optimized, and the charging efficiency is effectively improved under the premise of guaranteeing the safety and service life of the battery.

The application provides a battery, a battery pack and a power utilization device, the battery comprising a negative electrode sheet, the negative electrode sheet comprising a negative electrode current collector and a negative electrode active material layer arranged on at least one side of the negative electrode current collector; the negative electrode active material layer comprising a negative electrode active material; the negative electrode active material comprising a negative electrode active substance and a coating layer existing on the surface of the negative electrode active substance, the coating layer comprising amorphous carbon; and a SEI film existing on the surface of at least part of the negative electrode active material of the negative electrode active material layer, the SEI film containing fluorine elements and oxygen elements, and the atomic ratio of the oxygen elements to the fluorine elements in the SEI film being (1.5-7.5):1. The application can improve the fast charging performance, high-temperature storage and high-temperature cycle performance of the battery.

The invention discloses a T-Nb2O5 negative electrode material with high fast charging performance and a preparation method and application thereof, and belongs to the technical field of lithium ion battery materials. The method comprises the following steps: successively dispersing a niobium source, oxalic acid dehydrate and ammonium fluoride into water to obtain a clear solution, adding citric acid, and regulating and controlling a microflower-shaped precursor to preferentially expose a high-activity crystal face; carrying out hydrothermal reaction on the solution, and then carrying out centrifugal drying to obtain a uniform precursor; and calcining the precursor at a high temperature in an oxygen-containing atmosphere, cooling to 200-400 DEG C at a rate of 2 DEG C / min after calcining is finished, and rapidly immersing in saline water to rapidly cool to room temperature, thereby forming a high-activity interface layer on the surface layer of the material in situ. The T-Nb2O5 negative electrode material with a'crystal core-active shell 'composite structure is obtained through a cooperative temperature control strategy, the material has excellent bulk-phase ion transport kinetics and extremely low surface-interface reaction impedance, the charge-discharge capacity retention ratio is remarkably improved at a high rate of 10C, and the material has excellent cycle stability and fast charge performance and is suitable for being used in the field of lithium ion batteries and lithium ion batteries, such as lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries and lithium ion batteries. The method is suitable for high-power lithium ion batteries.

The invention provides a negative electrode material and a battery, the negative electrode material comprises an inner core and a coating layer located on at least part of the surface of the inner core, the inner core comprises graphite, the coating layer comprises a polymer, and the negative electrode material comprises at least one of an element N, an element S and an element P; the repose angle of the negative electrode material is theta degrees, the tap density of the negative electrode material is rho g / cm < 3 >, the compaction density of the negative electrode material under the pressure of 5T is T1 g / cm < 3 >, and the negative electrode material meets the formula: M = theta / rho * T1, and M is more than or equal to 105 and less than or equal to 160. According to the negative electrode material provided by the invention, the negative electrode material has high capacity, high compaction density and low expansion performance, and the fast charging performance of the negative electrode material is improved.

The application relates to a secondary battery and a power consumption device, and belongs to the technical field of batteries. The secondary battery comprises a positive pole piece and a negative pole piece, the positive pole piece comprises a positive pole current collector and a positive pole active layer arranged on the surface of the positive pole current collector, the positive pole active layer comprises a positive pole active material; the negative pole piece comprises a negative pole current collector and a negative pole active layer arranged on the surface of the negative pole current collector, the negative pole active layer comprises a negative pole active material; and the secondary battery satisfies 0.14<=Z<=4.67; wherein Z=(n1 / n2)*(p1 / p2). The secondary battery can maintain high energy density, and has good fast charging performance and long cycle life.

The invention relates to a modified graphite negative electrode material and a preparation method thereof, a negative electrode and a lithium ion battery. The modified graphite negative electrode material comprises graphite particles and an SEI precursor layer which is uniformly coated on the surface of each graphite particle and is constructed by lithium salt, wherein the lithium salt is of a crystalline state structure, and the thickness of the SEI precursor layer is 1-500 nm; during the first charging and discharging process of the battery, the lithium salt of the SEI precursor layer is subjected to electrochemical reaction prior to electrolyte, and an inorganic phase SEI with LiF and / or Li3PO4 as a main component is formed on the surface of graphite particles in situ. The negative electrode material disclosed by the invention realizes active formation and uniform distribution of SEI, even in a thick electrode, a continuous SEI layer can be formed on the surface of a deep graphite particle in the first charge-discharge and cycle process of a battery, the first-cycle coulombic efficiency is remarkably improved, the cycle life is remarkably prolonged, and the low-temperature and rate performance is improved; in addition, the electrolyte can more easily infiltrate the electrode, so that Li < + > is more smoothly transmitted in the thick electrode, and the electrochemical performance of the electrode is improved.

The invention relates to the technical field of lithium battery materials, in particular to a gradient hole composite current collector with an integrally-formed tab and a preparation method thereof.The gradient hole composite current collector with the integrally-formed tab comprises a base film, and the base film is sequentially provided with a tab area, a first area and a second area in the width direction of the base film; the first area and the second area are respectively provided with a plurality of holes penetrating through the base film in the thickness direction, the density of the holes in the first area is greater than that of the holes in the second area, the side surface of the base film is sequentially provided with a bottom layer and a metal layer, and the bottom layer and the metal layer extend out of the base film from one side of the tab area of the base film. In the technical scheme provided by the invention, the bottom layer and the metal layer cover the tab area and the part extending out of the base film is used as the tab, and the tab and the current collector main body are the same continuous metal body, so that perfect metallurgical bonding is realized, the contact resistance tends to zero, and all failure risks caused by welding or gluing are thoroughly eliminated.

The invention discloses a negative electrode material and a preparation method and application thereof. The preparation method of the negative electrode material comprises the following steps: carbonizing a mixture containing graphite and a coating agent, wherein the coating agent comprises a molecular sieve and liquid phase pitch; the mass ratio of the molecular sieve to the liquid phase pitch is 5-25%; the mass ratio of the coating agent to the graphite is 1%-15%. The negative electrode material comprises a graphite matrix and a composite coating layer coating the surface of the graphite matrix, the composite coating layer comprises amorphous carbon and a molecular sieve skeleton, and the composite coating layer contains pores; wherein the mass ratio of the composite coating layer to the graphite matrix is 1%-15%. The preparation method can optimize the pore size and other parameters of the obtained negative electrode material and the comprehensive performance of the obtained battery, and also has the advantages of low cost, simple process, easy large-scale production and the like.

This invention relates to the field of battery technology, specifically to a composite anode material, its preparation method, and its applications. A composite anode material includes a carbon material matrix and a coating layer disposed on the surface of the carbon material matrix. The coating layer contains amorphous carbon and a dual-conductor composite. The dual-conductor composite has a core-shell structure, with the core layer containing a carbon-based conductive agent and the shell layer containing a fast-ion conductor. The composite anode material of this invention, through the synergy of the various layers, can further improve the fast-charging performance of the anode material and enhance the battery's capacity and cycle performance.

This application relates to the field of battery technology, specifically to battery cells, battery devices, energy storage devices, and power consumption devices. In the negative electrode sheet of a battery cell, the negative electrode active layer includes a first active layer and a second active layer. The second active layer is disposed between the first active layer and the negative electrode current collector. The first active layer contains a first negative electrode active material, and the second active layer contains a second negative electrode active material. The sphericity of the first and second negative electrode active materials is independently 0.7~0.9, and their roundness is independently 0.42~0.65, respectively. Furthermore, the sphericity and / or roundness of the first negative electrode active material is greater than that of the second negative electrode active material. This application can improve the irreversible thickness growth of the negative electrode sheet during cycling and enhance kinetics, thereby helping to reduce the volume expansion of the cell throughout its life cycle while maintaining fast-charging performance.

The application relates to the technical field of lithium ion batteries, and provides a positive electrode sheet and application thereof. The positive electrode sheet comprises a positive electrode active layer, the positive electrode active layer comprises T elements, the T elements comprise at least one of Al, Nb, P, Ta, Si, Mg and Ti; the positive electrode sheet satisfies 0.25 <= a * c / b <= 750, wherein a is the average pore size of the positive electrode active layer, the unit is mu m, b is the surface resistance of the positive electrode sheet, the unit is ohm * square centimeter, and c is the mass proportion of the T elements in the positive electrode active layer, the unit is ppm. The application controls the synergistic relationship among the average pore size of the positive electrode active layer, the surface resistance of the positive electrode sheet and the mass proportion of the T elements in the positive electrode active layer, inhibits the side reaction between the positive electrode active layer and electrolyte, promotes lithium ion transmission, and improves the cycle performance and fast charging performance of the battery.

The application discloses a kind of porous graphite, preparation method and application of silicon-carbon composite material, belong to battery material technical field.The preparation method is: metal, petroleum coke and its dopant are mixed uniformly, pre-carbonization, graphitization, obtain graphite material, then it is etched to pore by plasma technology, then activation, obtain porous graphite;Finally by silane cleavage method, pass in silane mixed gas and carry out nanometer silicon deposition, passivation, then the obtained material is added to the solution of lithium molybdate and lithium sulfonate and coated, spray drying, obtain double lithium compound coated silicon-carbon composite material.The obtained material utilizes the characteristics that porous graphite itself electronic conductivity is high, and the outer layer coated double lithium salt structure improves ionic conductivity and its first efficiency, and plays the synergistic effect between the two, reduces expansion, improves cycle performance.

The invention discloses a secondary battery and an electric device, and belongs to the technical field of secondary batteries. The secondary battery comprises a battery cell and an electrolyte, the battery cell comprises a positive plate and a negative plate, the positive plate comprises a positive material layer, and the positive material layer comprises a nickel-cobalt ternary material. The cyclic sulfate compound is introduced into the electrolyte, and the ratio a of the nickel-cobalt ternary material, the ratio b of the thickness of the negative electrode material layer to the particle size Dv50 of the negative electrode material and the mass percentage c of sulfate functional groups in the electrolyte are comprehensively regulated and controlled, so that a / (b * c) is in a suitable range, the internal impedance of the secondary battery can be reduced, and the service life of the secondary battery is prolonged. The fast charging performance of the secondary battery is improved, so that the positive plate and the negative plate are not easy to generate side reaction with electrolyte, and the cycle performance of the secondary battery is improved.

The invention discloses a graphite material and a preparation method thereof, an electrochemical device and electronic equipment. The graphite material meets the following conditions: La is less than or equal to 72 nm, and Lc is less than or equal to 15 nm; wherein La is a lattice constant of a graphite crystal in the graphite material on a 110 plane, and Lc is a lattice constant of the graphite crystal in the graphite material on a 002 plane; f is greater than or equal to 15 mN, and F is particle crushing force. An electrochemical device (especially a lithium ion battery) containing the composite material can ensure excellent first effect and fast charge performance, and also has excellent self-discharge performance, capacity performance and cycle performance.

The invention discloses a preparation method and low-temperature application of a Te-doped tungsten niobium oxide / molybdenum niobium oxide heterojunction, and belongs to the technical field of secondary batteries. The preparation method specifically comprises the following steps: carrying out high-energy ball milling and alloying on WO3, Nb2O5 and Te2O5 to obtain amorphous Te-doped tungsten niobium oxide; the preparation method comprises the following steps: carrying out high-energy ball milling and alloying on MoO3, Nb2O5 and Te2O5 to obtain amorphous Te doped molybdenum niobium oxide; uniformly mixing and compacting the amorphous Te doped tungsten niobium oxide and the amorphous Te doped molybdenum niobium oxide, and performing discharge plasma sintering in an inert atmosphere to obtain the ceramic crystal Te doped tungsten niobium oxide / molybdenum niobium oxide heterojunction material. The Te-doped tungsten niobium oxide / molybdenum niobium oxide two-phase heterojunction material designed by the invention is relatively short in synthesis time, the synthesis period is shortened, the size of crystal grains is convenient to regulate and control, the crystallinity of the material is very good, the diffusion rate of lithium ions is greatly promoted by a heterojunction interface, the electron conductivity is improved by cooperating with Te doping, and the performance of the Te-doped tungsten niobium oxide / molybdenum niobium oxide two-phase heterojunction material is improved. The material can be used as a lithium ion negative electrode material with fast charging characteristic and good low-temperature performance.

This invention relates to the technical field of lithium-ion batteries, and provides a separator and a battery. The separator includes manganese, with the mass percentage of manganese in the separator denoted as a%, and the air permeability of the separator denoted as bs / 100mL. a and b satisfy the condition: 1.3 ≤ a × b ≤ 67. This invention improves battery cycle life and optimizes fast-charging performance by controlling the mass percentage of manganese in the separator and the air permeability of the separator to satisfy a specific relationship.

The application provides a lithium ion battery, which comprises a positive electrode sheet and a negative electrode sheet, and a diaphragm is arranged between the positive electrode sheet and the negative electrode sheet, the positive electrode sheet comprises a positive electrode current collector and a positive electrode active material layer arranged on one side or both sides of the positive electrode current collector, wherein the positive electrode active material layer comprises a positive electrode active material, the positive electrode active material comprises a modified element, the mass content a of the modified element in the positive electrode active material and the air permeability b of the diaphragm satisfy the following relationship: 0.06<=a*b<=5.4 (I), the modified element is selected from metal elements and / or non-metal elements, and the bond energy of the modified element combined with oxygen atoms is greater than the bond energy of nickel elements combined with oxygen atoms. When a and b satisfy the above relationship (I), the cross talk between the positive electrode and the negative electrode can be reduced, the active lithium loss and the side reaction can be reduced, and the lithium ion battery with excellent fast charging performance and cycle life is obtained.

The invention discloses a graphite material and a preparation method thereof, an electrochemical device and electronic equipment. The graphite material comprises an inner core and a shell, and the material of the inner core comprises first graphite; the material of the shell comprises second graphite; the graphite material meets the following conditions: 6 < K < = 30, and K is a shape coefficient; 1.06 < = F < = 1.12, and F is a withstand voltage coefficient; 0 < = L < = 2%, and L is bulk phase porosity. The graphite material provided by the invention has good compaction density, and has good fast charging performance and cycle performance when being applied to a battery.

The application relates to the technical field of secondary batteries, and particularly provides an isolation film, a preparation method thereof, a secondary battery and a power utilization device. The isolation film comprises a porous base film, the porous base film comprises a base phase and a filling phase dispersed in the base phase, the test curve of the differential scanning calorimeter of the porous base film simultaneously comprises a melting peak of the base phase and a melting peak of the filling phase, and the temperature of the melting peak of the base phase is higher than that of the melting peak of the filling phase. The isolation film provided by the application can provide the reliability of the secondary battery.

This invention discloses a preparation method and application for improving the fast-charging performance of graphite composite materials. The preparation method involves mixing a graphite precursor with a catalyst and a conductive liquid, ball milling the mixture, followed by pre-carbonization, low-temperature graphitization, and acid washing to obtain a graphite precursor material. Then, the graphite precursor is mixed with a heteroatom polymer, a phosphorus compound, and an organotitanium compound, and heat-treated to obtain the graphite composite material. The graphite composite material prepared by this invention utilizes a catalyst to enhance the anisotropy of carbon during graphitization, and improves electronic conductivity through the conductive agent doped into the core. The titanium dioxide coating on the composite material's outer shell has the characteristics of large interlayer spacing, low expansion rate, and structural stability, which improves the lithium-ion insertion / extraction rate and rate performance. Since phosphorus itself has high specific capacity and a high voltage plateau, phosphorus doping improves the specific capacity and voltage plateau of the composite material, thus enhancing its fast-charging performance.

This invention provides a battery negative electrode sheet and its preparation method. At least one surface of the current collector is provided with an active material layer comprising single-walled carbon nanotubes (SUVs) and silicon-carbon. Grooves are formed on the active material layer, and the depth of the grooves is related to the content of SUVs and silicon-carbon as follows: H = 0.236 × b / w; where H is the groove depth in μm, w% is the mass percentage of SUVs, and b% is the mass percentage of silicon-carbon. This invention forms a synergistic system of "silicon-carbon improving energy density + single-walled carbon nanotubes improving fast-charging performance + grooves mitigating silicon-carbon deformation." By quantitatively defining the relationship between the groove depth and the content of the two core components, the structural stability problem caused by the volume expansion of silicon-carbon materials is solved, and the contradiction between fast-charging performance and energy density brought about by the addition of SUVs is balanced, enabling the negative electrode sheet to simultaneously possess high energy density, excellent fast-charging performance, and long cycle life.

The application discloses a kind of core-shell structure fast charging long cycle artificial graphite, its preparation method, negative electrode material and purposes, including, petroleum coke or acicular coke aggregate D50 8~20 μm, non-biomass hard carbon raw material powder D50 1~10 μm and pitch are mixed according to the mass ratio hard carbon: pitch = 1:9~5:5, aggregate: composite coating agent = 95:5~85:15, pre-mixing S1 is carried out at 100~200 DEG C, 160~220 DEG C melt kneading granulation S2, carbonization S3 is carried out at 600~1000 DEG C, and graphitization S4 is carried out at 2800~3200 DEG C, and core-shell structure artificial graphite is prepared by one-step method.The shell layer is composed of uniformly dispersed graphitized hard carbon and soft carbon, and is densely coated outside the artificial graphite core.The first reversible specific capacity of the product is greater than or equal to 350 mAh / g, the first coulombic efficiency is greater than or equal to 93%, and the capacity retention rate at 5.0C / 0.2C is greater than or equal to 84%, with excellent fast charging performance and cycle stability, simple process and low cost.

The application provides a positive electrode active material, a secondary battery and an electric device. The positive electrode active material of the application comprises an aluminum-doped lithium iron phosphate core and a carbon layer arranged on the surface of the core; the concentration of aluminum in the core decreases from the surface to the geometric center; and 5≤K≤20, K=(C1 / C2)×(I D / I G )×1000 / (Dv50×T) is satisfied; C1 is the average atomic concentration of aluminum in the surface region of the core; C2 is the average atomic concentration of aluminum in the central region of the core; I D is the intensity of the D peak of the positive electrode active material in the Raman spectrum; I G is the intensity of the G peak of the positive electrode active material in the Raman spectrum; Dv50 is the particle size corresponding to the volume accumulation of 50% of the positive electrode active material; and T is the thickness of the carbon layer. The positive electrode active material of the application can achieve higher rate performance, longer cycle life and excellent high-temperature stability when applied to a secondary battery.

The application relates to the field of electrochemistry, and provides a positive electrode additive composition, a positive electrode slurry and a positive electrode sheet, which comprise an additive powder, a dispersion aid and a solvent; the additive powder is a metal element doped metal organic framework material; the metal element comprises at least one of Li, Na, K, Ca, Mg, Cu, Co, Ni, Fe, Cr, Ti, Zn and Mn, and the molar content of the metal element is 0-2.3 based on the amount of substance of the metal element doped metal organic framework material. The additive is first fully wetted and dispersed to form a positive electrode additive composition in the form of a mixed glue liquid, and then added into the slurry, so that the problem of easy agglomeration of the additive powder can be effectively solved, and the stability of the positive electrode slurry is improved. The positive electrode additive composition is in the form of a mixed glue liquid, so that the additive is easier to mix with other materials, the preparation process of the positive electrode slurry can be simplified, and the production efficiency is improved.