302results about How to "Improve discharge capacity" patented technology

The invention provides an anion-cation co-doped modified lithium manganese phosphate positive electrode material and a preparation method thereof, the lithium manganese phosphate positive electrode material comprises anion-cation doped lithium manganese phosphate and a carbon layer, the carbon layer is coated on the surface of the anion-cation doped lithium manganese phosphate, the chemical general formula is LiMn < 0.6 > Fe < 0.4-x > M < x > PO < 4-y > Fy, 0.001 < = x < = 0.03, 0.01 < = y < = 0.5, and 0 < = y < = 0.5. M is a cation, and Y is a fluorine ion. According to the preparation method, carbon layer coating and anion and cation co-doping modification of the lithium manganese iron phosphate positive electrode material are simultaneously realized through a one-step hydrothermal method, and the prepared lithium manganese iron phosphate positive electrode material is in an irregular spherical shape, relatively smooth in particle surface, and relatively high in large and small particle grading and compaction; after a performance test, compared with an electrode material which is not doped with anions and cations, the material disclosed by the invention has the advantages that the stability and the discharge capacity of the material are remarkably improved, and the electrochemical performance of the lithium manganese iron phosphate positive electrode material is effectively improved.

The invention discloses a sodium ion battery positive electrode material, a preparation method and a battery. The general formula of a sodium transition metal oxide of the positive electrode material is Na < x > Fe Mn M < c > Nd < LeP < f > O < 2 >, 0.7 < = x < = 0.9, 0.4 > = a > = 0.1, 0.8 > = b > = 0.4, 0.1 > = c > 0, 0.1 > = d > 0, 0.1 > = e > 0, 0.1 > = f > 0, a + b + c + d + e + f = 1, M, N, L and P are four different elements in Li, K, Mg, Ni, Zn, Ca, Cu, Al, B, La, Zr and Ti, and the four selected elements are + 1 valence, + 2 valence, + 3 valence and + 4 valence respectively. In this way, high charging capacity can be provided, and structure expansion and contraction can be suppressed; more active sites are achieved, and ultrahigh discharge capacity and ultrahigh cycling stability are achieved; the structure stability is extremely high, and the sodium ion battery has relatively high specific capacity and relatively long circulation.

The invention provides a high-voltage bidirectional NPN electrostatic protection device and a preparation method thereof. The high-voltage bidirectional NPN electrostatic protection device comprises a P-type substrate, an N-type buried layer on the P-type substrate and a bidirectional NPN device structure on the N-type buried layer, the bidirectional NPN device structure comprises a P-type epitaxial layer, a P-type buried layer at the bottom of the P-type epitaxial layer, a first N-type well, a P-type well, a second N-type well, a first floating P + injection region in the P-type well, a second floating P + injection region in the first N-type well and a third floating P + injection region in the second N-type well, the M N + injection regions are arranged on the outer side of the second floating P + injection region at intervals; the M N + injection regions are arranged on the outer side of the third floating P + injection region at intervals; m is a natural number greater than or equal to 2. The bidirectional ESD protection circuit is suitable for a high-voltage port needing bidirectional ESD protection, the discharge capacity of ESD current and the maintaining voltage of a bidirectional NPN triode are improved, and the bidirectional ESD protection circuit has high area efficiency and high latch-up resistance.

The invention discloses positive lead paste for a lead storage battery and a preparation method of the positive lead paste. The formula of the positive lead paste comprises lead powder, dilute sulphuric acid, water and an additive, and the additive comprises the following components in parts by mass: 2-6 parts of manganese dioxide / three-dimensional carbon-based composite electrode material, 1-2 parts of antimony trioxide, 1-2 parts of stannous mono-sulphate, 20-50 parts of red lead and 0.8-1.2 parts of polyester fiber. The manganese dioxide / three-dimensional carbon-based composite electrode material is adopted to replace conductive graphite and other conductive carbon materials, the conductivity is good, a stable three-dimensional structure is achieved, the active substance structure can be fixed during discharging, the positive active substance is effectively prevented from being softened, and the service life of the battery is prolonged; manganese dioxide has an oxidation catalysis function and can catalyze the efficiency of converting lead sulfate into lead dioxide, so that the charging capacity of the positive plate is greatly improved during charging, and side reactions are reduced; the composite electrode material has high specific capacitance, and the discharge capacity of a positive plate is improved during discharge.

The invention provides a graphite negative electrode material for a lithium battery and a preparation method of the graphite negative electrode material. The preparation method comprises the following steps: (1) preparing modified phenolic resin; (2) adding natural graphite and the modified phenolic resin into a reaction kettle, continuously adding the modified graphene, and stirring, heating and coating in a nitrogen atmosphere, specifically, heating to 150-200 DEG C at a speed of 1-2 DEG C / min, preserving heat for 100-120 minutes, heating to 550-600 DEG C at a speed of 4-6 DEG C / min, preserving heat for 180-200 minutes, and cooling to obtain coated graphite; and (3) carbonizing the coated graphite in an atmosphere furnace, and sieving to obtain the graphite negative electrode material for the lithium battery. When the negative electrode material is used for preparing a lithium battery, the capacity retention ratio is high, the rate capability is good, the impedance is low, and the lithium precipitation point of fast charge is high.

The invention discloses a preparation method and application of morphology-compounded iron phosphate. The preparation method comprises the following steps: S1, dissolving an iron source in a phosphoric acid solution to obtain a ferrous dihydrogen phosphate solution; s2, heating and stirring, adding a part of hydrogen peroxide, and carrying out a first-stage oxidation reaction to obtain a turbid liquid; s3, adding maleic anhydride into the obtained turbid liquid, fully mixing and stirring, adding the rest of hydrogen peroxide, carrying out two-stage oxidation reaction, and aging; s4, after the solvent is filtered out, washing, drying and roasting are conducted, and iron phosphate is obtained. The iron phosphate prepared by the method disclosed by the invention has two completely different morphologies, i.e., a sheet shape and a block shape, and the particle sizes of the sheet shape and the block shape are equivalent, so that the lithium iron phosphate does not need to be prepared through large and small particle grading, and meanwhile, the obtained lithium iron phosphate has the advantages of high compaction density and large discharge capacity.

The invention provides a negative pole piece and a preparation method thereof, the negative pole piece comprises a current collector, a first active material layer and a second active material layer, the current collector is coated with the first active material layer and the second active material layer in sequence, and the gram volume of the first active material layer is larger than that of the second active material layer. The expansion rate of the first active material layer is greater than that of the second active material layer; the first active material layer comprises an alloy A supported by a carbon material; the second active material layer includes hard carbon. According to the negative pole piece, the alloy A supported by the carbon material combined by different alloys is prepared, so that the alloy A supported by the carbon material has different expansion coefficients and gram volumes, and the larger the gram volume is, the larger the energy density is; by preparing the N-doped and P-doped hard carbon, the conductivity of the material and the first effect of the lithium ion battery can be greatly improved, electron and lithium ion transport channels in the hard carbon are increased, the capacity of the material is effectively improved, and the performance of the battery adopting the negative pole piece is greatly improved.

The invention provides asphalt-based hard carbon microspheres, a preparation method thereof and a sodium ion battery. The preparation method comprises the following steps: S1, stirring asphalt and basic zinc carbonate microspheres in a solvent for reaction to obtain an asphalt-based carbon microsphere precursor; s2, mixing the asphalt-based carbon microsphere precursor with a metal salt modifier to obtain a modified asphalt-based carbon microsphere precursor; the metal salt modifier is zinc salt, magnesium salt or calcium salt; s3, annealing and carbonizing the modified asphalt-based carbon microsphere precursor; and S4, carrying out acid pickling, water washing and drying treatment on the carbonized product to obtain the asphalt-based hard carbon microspheres. Through the combined action of a template method and the metal salt modifier, the pore structure and morphology of the hard carbon material are improved, so that the hard carbon material has high specific surface area and rich pore structures, and the obtained hard carbon material has excellent performance, high discharge capacity and high initial charge-discharge efficiency.

The utility model provides a pole piece and a battery, the pole piece comprises a current collector and an active material layer coated on the surface of the current collector, a double-sided paste coating area is formed by partial section of the pole piece, and the active material layers are coated on the two side surfaces of the current collector in the double-sided paste coating area; the double-sided pasting area in the first direction comprises a first end area, a middle area and a second end area which are arranged in sequence, the active material layer in the first end area is provided with a plurality of first pits, the active material layer in the second end area is provided with a plurality of second pits, and the active material layer in the middle area is provided with a plurality of third pits; wherein the average depth of each first pit is smaller than the average depth of each third pit, and / or the average depth of each second pit is smaller than the average depth of each third pit. By improving the total amount of the electrolyte, the wettability of active substances and the structural strength of the end part of the pole piece, the energy density and the battery performance of the battery are improved.

The invention relates to a positive electrode active material, a positive electrode, and a rechargeable lithium battery. The positive electrode active material comprises a first positive electrode active material, a second positive electrode active material and a third positive electrode active material; the first positive electrode active material includes a lithium nickel manganese-based composite oxide in which a nickel content is greater than or equal to about 60 mol% based on 100 mol% of a total metal other than lithium in the first positive electrode active material, and is in the form of a plurality of secondary particles each including a plurality of aggregated primary particles, the second positive electrode active material is in the form of a plurality of individual particles including a lithium nickel manganese-based composite oxide having a nickel content of greater than or equal to about 60 mol% based on 100 mol% of a total metal other than lithium in the second positive electrode active material, and the third positive electrode active material is in the form of a plurality of particles including a lithium manganese-based oxide.

The invention provides a carbon-coated metal element-doped lithium ferrite material and a preparation method and application thereof.The material is of a core-shell structure, the core-shell structure comprises an inner core and a coating layer, and the coating layer is arranged on at least part of the outer surface of the inner core; the inner core comprises lithium ferrite doped with an element L; the element L is selected from at least one of Co, Ni, Cu, Ga, Pb, Sn, Zn and Rh; and the coating layer comprises a carbon elementary substance. The carbon-coated metal element doped lithium ferrite material provided by the invention has the characteristic of relatively high discharge gram capacity.

The invention relates to the technical field of lithium ion battery positive electrode materials, in particular to a composite phosphate positive electrode material and a preparation method and application thereof. The provided composite phosphate positive electrode material comprises a phosphate positive electrode material core and a carbon coating layer, the particle size of the composite phosphate positive electrode material is in normal distribution, the thickness of the carbon coating layer is 2.0-3.0 nm, and the variance is 0.01-0.30. The obtained finished product is relatively large in particle size and uniform in particle size, and the compaction density is remarkably improved; moreover, the surface of the core material is uniformly coated with the carbon coating layer, and the thickness of the carbon coating layer is moderate, so that not only can the electronic conductivity of the positive electrode material be improved, but also the discharge capacity, coulombic efficiency and other electrochemical properties of the composite phosphate positive electrode material can be improved.

The invention discloses a graphite negative electrode material and a preparation method thereof. The invention provides a carbon nano tube / silicon carbide composite material which comprises silicon carbide particles and carbon nano tubes, and the carbon nano tubes are coated on the silicon carbide particles. According to the carbon nano tube / silicon carbide composite material and the carbon nano tube / silicon carbide-graphite matrix composite material disclosed by the invention, a graphite negative electrode material with a stable overall structure and high capacity is obtained by adopting a new coating mode and a new coating process, and the graphite negative electrode material can be used for an artificial graphite negative electrode.

The invention provides a positive pole piece and a preparation method and application thereof.The positive pole piece comprises a current collector and a coating arranged on the surface of at least one side of the current collector, and the coating comprises a first active layer arranged on the surface of the current collector; the second active layer is arranged on one side, far away from the current collector, of the first active layer; the first active layer comprises a first Prussian positive electrode material, and the second active layer comprises a polyanion positive electrode material; in the coating, the content of the first Prussian positive electrode material is smaller than that of the polyanion positive electrode material. According to the positive pole piece disclosed by the invention, different types of positive pole materials are used in different active layers, and the content of the first Prussian positive pole material is smaller than that of the polyanion positive pole material, so that the positive pole piece has relatively good thermal stability, cycling stability and capacity at the same time.

The invention relates to a lithium iron phosphate positive electrode material, a preparation method thereof and a battery, the lithium iron phosphate positive electrode material comprises lithium iron phosphate particles, the lithium iron phosphate particles comprise spherical or sphere-like particles with D50 of 0.5-2 [mu] m, and the surfaces of the lithium iron phosphate particles are coated with carbon nanotubes through a binder. The surface of the lithium iron phosphate material is uniformly coated with the carbon nanotubes, so that the carbon nanotubes are not added in the subsequent anode slurry homogenizing process, the phenomenon of non-uniform dispersion of the conductive agent is avoided, the homogenizing process time is shortened, the production efficiency is improved, and the method has very important economic benefits. The carbon nanotubes are bonded and coated on the surfaces of spherical or spheroidal lithium iron phosphate particles with D50 of 0.5-2 microns through the binder, the bonding strength of the nanotubes is relatively good, the conductivity of the material can be remarkably improved, the carbon nanotubes also have the advantages of good conductivity, relatively high compaction density and the like, and the coating is stable in bonding and relatively good in conductivity.

The invention discloses a modified MOFs filler, a preparation method and a composite solid electrolyte of a lithium ion battery, and the preparation method of the modified MOFs filler comprises the following steps: adding cerium salt during preparation of an MOF material to obtain a cerium-doped MOF material; or after the MOF material is prepared, the MOF material is etched, and the etched MOF material is obtained. The preparation method of the composite solid electrolyte comprises the following steps: dispersing the prepared MOF material in a solvent under the protection of inert gas, adding an electrolyte lithium salt and PEO, stirring to obtain a colloidal suspension, pouring the colloidal suspension into a mold, and drying and molding. After the obtained modified MOFs filler is added into the composite solid electrolyte, the conductivity of the composite solid electrolyte can be effectively improved, the composite solid electrolyte has a wide electrochemical stability window, and an assembled lithium ion battery shows excellent electrochemical performance.

The invention relates to a positive electrode active material, a positive electrode, and a rechargeable lithium battery. The positive electrode active material includes: a first positive electrode active material including a lithium nickel manganese-based composite oxide having a nickel content of greater than or equal to about 60 mol% based on a total amount of a metal other than lithium of about 100 mol% and including secondary particles made by aggregating a plurality of primary particles, wherein the secondary particles have an average particle diameter (D50) of about 10 [mu] m to about 20 [mu] m; a second positive electrode active material including a lithium nickel manganese-based composite oxide having a nickel content of greater than or equal to about 60 mol% based on a total amount of a metal other than lithium of about 100 mol% and including a single particle in which an average particle diameter (D50) of the single particle is about 2 [mu] m to about 8 [mu] m; and a third positive electrode active material containing particles including a lithium transition metal phosphate.

The present invention relates to a silicon-carbon composite material, a method for manufacturing the silicon-carbon composite material, and a negative electrode active material comprising the silicon-carbon composite material. The silicon-carbon composite material is a silicon-carbon composite material containing silicon particles and carbon. Since the molar ratio of oxygen (O) atoms to silicon (Si) atoms in the silicon-carbon composite material satisfies 0.05 to 0.45, when the silicon-carbon composite material is applied to a negative electrode active material, it is possible to simultaneously improve the discharge capacity, initial efficiency, and capacity retention after circulation of a lithium secondary battery.

The invention relates to a composite positive electrode material, a positive electrode plate and a battery. The composite positive electrode material comprises a lithium manganate material and a lithium-rich sodium-rich manganese-based material, and the median particle size of the lithium manganate material is greater than that of the lithium-rich sodium-rich manganese-based material; the compaction density PD of the composite positive electrode material meets 1.05 * (X1 * PD1 + X2 * PD2) lt; pDlt; 1.2 * (X1 * PD1 + X2 * PD2), and PDgt; x1 represents the mass fraction of the lithium manganate material in the composite positive electrode material, X1 is larger than or equal to 50% and smaller than or equal to 90%, PD1 represents the compaction density of the lithium manganate material, X2 represents the mass fraction of the lithium-rich sodium-rich manganese-based material in the composite positive electrode material, X2 is larger than or equal to 10% and smaller than or equal to 50%, PD2 represents the compaction density of the lithium-rich sodium-rich manganese-based material, and max represents the maximum value of PD1 and PD2. The composite positive electrode material disclosed by the invention is lower in cost and excellent in cycle performance, and can remarkably improve the electrical performance when being applied to a battery.

The invention provides a preparation method of a high-conductivity lithium manganese iron phosphate material, the preparation raw materials of the lithium manganese iron phosphate material comprise a three-dimensional sheet niobium pentoxide conductive frame, a manganese source, an iron source, a lithium source and a carbon source, the niobium pentoxide conductive frame is of a sheet porous structure, the structure can accommodate the lithium manganese iron phosphate material to be filled between sheet layers and pores, so as to form a three-dimensional spherical structure; the obtained spherical lithium manganese iron phosphate material has excellent conductivity and processability, and can show relatively high discharge capacity of a button cell when being used as a positive electrode material of a lithium ion battery.

The invention provides a metal particle doped self-supporting carbon-based material as well as a preparation method and application thereof. The metal particles comprise metal elementary substance particles, and in the self-supporting carbon-based material doped with the metal particles, the loading capacity of the metal elementary substance particles is 15-55 wt%; the preparation method comprises the following steps: firstly, mixing a polymer, metal salt and a solvent, and preparing a carbon-based material precursor through electrostatic spinning; then sequentially carrying out pre-oxidation and calcination on the carbon-based material precursor; wherein the types of metal salts and the conditions of pre-oxidation and calcination are defined. According to the preparation method, by limiting the gas components in the calcination process and the temperature and time ranges in the pre-oxidation and calcination processes, the loading capacity of the metal elementary substance particles is remarkably improved, the precursor is fully carbonized to form the carbon fibers, and the prepared self-supporting carbon-based material is good in discharge capacity and cycle performance.

The invention discloses a solid electrolyte membrane and a preparation method and application thereof, and belongs to the technical field of electrolyte. The solid electrolyte membrane is composed of a porous aromatic skeleton self-assembled polyoxazoline ion conductor, a film-forming agent and a zinc salt, the porous aromatic skeleton self-assembled polyoxazoline ion conductor is composed of a sulfonated porous aromatic skeleton and a polyoxazoline chain generated by initiating polymerization in pores of the sulfonated porous aromatic skeleton; the sulfonated porous aromatic skeleton is connected with the polyoxazoline chain through a hydrogen bond. The solid electrolyte membrane is uniform, smooth, transparent, free of phase separation, high in ionic conductivity and low in glass transition temperature, and the all-solid-state zinc ion battery prepared from the solid electrolyte membrane has high discharge capacity, excellent rate capability and excellent cycling stability at low temperature.

The invention relates to the technical field of sodium ion battery materials, and discloses a sodium ion battery layered oxide positive electrode material which is characterized in that the chemical formula is NaaNixFeyMnzM1-x-y-zO2, 0.8 < = a < = 1.1, 0 < = x < = 1, 0 < = y < = 1, 0 < = z < = 1, M = M1 + M2, M1 = at least one of Zn, Ca, Cu, Sb, Ba, Mg, Zr, Y, Cs, Mo, Sn, Ce, La, F, B, Ti, Zr and Li, and M2 = at least one of B, Al, Zr, Ti, Ce, W and P; and pyrolyzing and sintering the metal or the salt thereof in a solvent system to obtain a finished product. The low-cost process provided by the invention does not need to synthesize a precursor, but directly adopts a one-step method to synthesize the layered oxide positive electrode material of the sodium-ion battery. According to the method, the capacity, circulation and residual alkali of the sodium-ion battery are obviously improved, and large-scale popularization and application of the sodium-ion battery are facilitated.

The invention relates to the field of sodium ion batteries, and discloses a sodium vanadium phosphate composite positive electrode active material, a preparation method thereof and a sodium ion battery. The sodium vanadium phosphate composite positive electrode active material comprises a sodium vanadium phosphate inner core and a carbon coating layer coating at least part of the surface of the sodium vanadium phosphate inner core; and the compaction density of the sodium vanadium phosphate composite positive active material is greater than 1.8 g / cm < 3 >. When the positive electrode active material with relatively high compaction density is applied to the sodium ion battery, the diffusion path of sodium ions can be reduced, the energy density of the battery is improved, the discharge capacity of the battery is increased, the internal resistance of the battery is reduced, the polarization loss is reduced, the voltage platform of the battery is improved, and the rate capability and the cycle performance of the battery are ensured.

The invention belongs to the technical field of sodium ion batteries, and relates to a positive electrode sodium supplementing agent NaxFeyNizO4 (at) C, a preparation method thereof and an application of the positive electrode sodium supplementing agent NaxFeyNizO4 (at) C in a sodium ion battery. The preparation method of the positive electrode sodium supplementing agent comprises the following steps: S1, mixing a sodium source, an iron source, a nickel source and an organic solvent, and calcining to obtain a compound NFNC; and S2, the compound NFNC obtained in the step S1 and a carbon source are mixed and calcined to obtain the positive sodium supplement NaxFeyNizO4 (at) C, and x: y: z = (2-4): (0.5-2): 1. The preparation method is characterized in that a sodium source, an iron source, a nickel source and an organic solvent are mixed and then subjected to first calcination treatment to obtain a compound NFNC, and then the compound NFNC and a carbon source are mixed and then subjected to second calcination treatment, so that the obtained positive electrode sodium supplementing agent NaxFeyNizO4 (at) C can reduce gas production of a sodium ion battery after a formation stage; and the sodium ion battery has excellent discharge capacity and cycle performance in a working voltage range.

The invention relates to a preparation method and application of an organic coating material, in particular to a preparation method and application of a thiolated 3-chloropropanesulfonyl (trifluoromethanesulfonyl) lithium imide-triallyl phosphite organic coating material. In order to solve the problem of high reactivity of SC-NCM, a novel organic coating material, namely thiolated 3-chloropropanesulfonyl (trifluoromethanesulfonyl) lithium imide-triallyl phosphate (SH-LiCPSI-TLP), is provided by combining the influence of the type of the coating material and the form of a coating layer on the performance of the positive electrode material; as the Young modulus of an organic material is generally lower than that of an inorganic material, a uniform coating layer can be formed on the surface of the positive electrode material by adopting a simple wet coating method. An electrochemical test shows that after SH-LiCPSI-TLP is coated, the capacity diving phenomenon of the SC-NCM811 can be effectively inhibited, and under the 1C multiplying power, the capacity retention ratio is still 52.78% even if the SH-LiCPSI-TLP is circulated for 600 circles.

According to the SCR device, the process method and the chip, compared with a traditional LVTSCR device, the trigger voltage of the SCR device is lower, the maintaining voltage is higher, the deep hysteresis phenomenon can be avoided, the application scene of the SCR device is expanded, and the SCR device can be applied to a high-working-voltage port. In addition, the SCR device can also form a plurality of ESD current discharge paths, so that the ESD current discharge capacity of the chip in unit area is higher, the SCR device has the characteristic of low on-resistance, the area of the chip is effectively saved, and the production cost of the chip is reduced; in addition, the distribution of the ESD current in the SCR device is more uniform due to the plurality of ESD current discharge paths, and the discharge path robustness of the SCR device under large current is effectively improved.

The application relates to the technical field of sodium ion battery positive electrode materials, in particular to a Na2Fe2(SO4)3@Na3Fe2(SO4)3F@CNT positive electrode material.The Na2Fe2(SO4)3 and Na3Fe2(SO4)3F precursors are mixed and sintered, and are coated by CNT, so that the electrochemical performance of the Na2Fe2(SO4)3 is remarkably improved, the conductivity of the material is improved, the material can be used as a sodium ion battery positive electrode material, has a high discharge specific capacity, and has cycle performance and rate performance.

The invention discloses an ESD (Electro-Static Discharge) circuit and a chip. The ESD circuit comprises a primary discharge module and a secondary discharge module, a drain electrode of each discharge MOS tube is connected with a chip pin, a grid electrode is grounded through a corresponding first resistor, a source electrode is grounded, and a substrate electrode is connected with the bias signal providing unit; the first end of the secondary discharge module is connected with a chip pin, and the second end is connected with a chip internal circuit; the primary discharge module comprises at least one discharge MOS tube, a bias signal providing unit and first resistors corresponding to the discharge MOS tubes respectively; the first-stage discharge module is used for discharging electrostatic energy at the chip pins by connecting the discharge MOS tubes; the secondary discharge module is used for further discharging electrostatic energy at the chip pins; and the bias signal providing unit is used for providing a preset bias signal for each discharge MOS tube, so that each discharge MOS tube is in a weak conduction state when electrostatic energy passes through each discharge MOS tube. According to the invention, the electrostatic discharge capability can be enhanced from multiple aspects, so that the protection capability of related structures of the chip is improved.

The invention provides a positive electrode material and a battery, the positive electrode material is a lithium nickel cobalt oxide composite oxide, the powder conductivity of the positive electrode material is delta S / cm < 2 >, the particle size distribution width of the positive electrode material is Span, in an XRD pattern of the positive electrode material, the half-peak width of a characteristic peak corresponding to a (003) crystal plane of the positive electrode material is FWHM, and the positive electrode material meets the condition that (delta * span) / FWHM is more than 0.001 and less than or equal to 0.5. The positive electrode material provided by the invention has high capacity, strong structural stability and cycling stability.