286 results about "Lithium cobalt oxide" patented technology

In order to solve the problems that an existing positive electrode material is unstable in structure and low in energy density, the invention provides a positive electrode material and a preparation method thereof, a positive electrode plate and a battery, the positive electrode material comprises lithium cobalt oxide of a layered structure, the chemical formula of the lithium cobalt oxide is Li < 1-alpha-beta > Na < alpha > (Mg < gamma > Ti < delta > Co < 1-gamma-delta >) O2, alpha is smaller than or equal to 0.005, and beta is 0.02-0.05; gamma is equal to 0.002 to 0.004, delta is equal to 0.001 to 0.003, and gamma + delta is equal to 0.003 to 0.006.

The invention relates to the technical field of batteries, in particular to a composite positive electrode material, a preparation method thereof and a battery. The composite positive electrode material comprises a positive electrode substrate, a fast ion conductor layer and a halide layer, the positive electrode substrate comprises a doped lithium cobalt oxide material; the fast ion conductor layer is positioned on the surface of the positive electrode substrate and comprises an oxide of a metal element Q with a spinel phase; the halide layer is located on the surface of the fast ion conductor layer and comprises element lithium, metal element M and halogen X. Through coordination and cooperation of the matrix material, the fast ion conductor layer and the halide layer, the structural stability and the surface morphology of the material can be effectively improved, the defects of the material are overcome, and the composite positive electrode material has excellent conductivity and has excellent cycling stability and rate capability at high temperature and / or high voltage, so that the battery has high safety performance.

The invention relates to the technical field of lithium ion batteries, in particular to a high-voltage lithium cobalt oxide positive electrode material and a preparation method thereof. According to the technical scheme, the chemical composition of the positive electrode material is at least two elements selected from Al, Mg, Ti and Zr. Through triple strategies of multi-element synergistic doping, core-shell structure design and surface defect regulation and control, breakthrough improvement of the performance of the high-voltage lithium cobalt oxide positive electrode material is achieved, and especially through the synergistic effect of a specific element combination Al + Mg + Ti and the coupling effect of the gradient-distributed F element and the nanometer defect structure, the performance of the high-voltage lithium cobalt oxide positive electrode material is improved. The structure phase change and the interface side reaction in the high-pressure circulation process are effectively inhibited, and the cycle life and the thermal stability of the material are remarkably improved.

The invention discloses a method for regenerating and preparing high-voltage lithium cobalt oxide by using an invalid lithium cobalt oxide material, and belongs to the technical field of battery recovery. The method comprises the following steps: S1, carrying out ball milling and mixing on failed lithium cobalt oxide powder and a sodium source, and then carrying out solid-phase sintering to obtain a P2 type sodium cobalt oxide and lithium cobalt oxide material; s2, the P2 type sodium cobaltate and lithium cobaltate material is placed in a lithium-containing solution for a hydrothermal reaction, a regenerated O2-O3 cotype lithium cobaltate material is obtained, the regenerated O2-O3 cotype lithium cobaltate material has the advantages of being good in cycling stability, high in rate capability, high in low-temperature performance and the like under the high voltage of 4.6 V, and the performance of the regenerated O2-O3 cotype lithium cobaltate material is superior to that of a commercial lithium cobaltate material.

The invention provides a method for strengthening recovery of a waste lithium iron phosphate material by using waste lithium cobalt oxide as an oxidizing agent. The method comprises the following steps: discharging and disassembling waste lithium iron phosphate and lithium cobalt oxide batteries to obtain positive plates; dissolving aluminum foil in the positive plate in a sodium hydroxide alkaline leaching solution to obtain lithium iron phosphate and lithium cobalt oxide positive electrode powder; the method comprises the following steps: leaching lithium iron phosphate positive electrode powder by adopting a deep-eutectic solvent, and meanwhile, realizing an enhanced leaching process by taking lithium cobalt oxide positive electrode powder as an oxidizing agent; and carrying out coordination separation and photo-reduction separation on the completely leached solution to realize selective recovery of cobalt, iron, phosphorus and lithium. According to the method, the oxidation-reduction capacity of the material is fully utilized to strengthen the leaching process, efficient recovery of valuable elements in the waste positive electrode material is achieved, and additional addition of an oxidizing agent and a reducing agent is avoided. The method can achieve the purposes of synergistic enhanced leaching and selective separation of the waste lithium cobalt oxide material and the waste lithium iron phosphate material, and is low in cost, high in recovery rate and wide in industrial application prospect.

The invention belongs to the technical field of lithium ion batteries, and particularly discloses a composite coated high-voltage lithium cobalt oxide positive electrode material as well as a preparation method and application thereof. The positive electrode material comprises an inner core, and a first coating layer and a second coating layer which sequentially coat the inner core from inside to outside; the inner core is a doped lithium cobalt oxide matrix, the chemical formula is Li1 + xCo1-yM1yM2zO2, x is more than or equal to 0 and less than or equal to 0.1, y is more than or equal to 0.001 and less than or equal to 0.05, z is more than or equal to 0.001 and less than or equal to 0.05, M1 is selected from at least one of Al, Ni and Fe, and M2 is selected from at least one of Mg, Al, Zr, Zn, Ni, Fe, Sr, Mo, Ta and W; the chemical formula of the first coating layer is La1-mNmCoO3-n.Co3O4, m is greater than 0 and less than 1, n is greater than 0 and less than 3, and N is selected from one or two of Ca, Mg, Fe, Zn, Ba and Zr; and the second coating layer is cobalt oxide of YOF and Y. The core problems of bulk phase structure degradation, serious interface side reaction, interface impedance increase and the like under high voltage can be cooperatively solved.

The invention provides a lithium cobalt oxide composite material and a preparation method thereof, a positive plate and a lithium ion battery. The lithium cobalt oxide composite material comprises first lithium cobalt oxide composite particles and second lithium cobalt oxide composite particles; the first lithium cobalt oxide composite particles comprise first lithium cobalt oxide and a lithium-rich positive electrode material coating the surface of the first lithium cobalt oxide; the second lithium cobalt oxide composite particles comprise second lithium cobalt oxide and a lithium-rich positive electrode material coated on the surface of the second lithium cobalt oxide; the D50 particle size of the first lithium cobalt oxide composite particles is larger than that of the second lithium cobalt oxide composite particles. The lithium-rich positive electrode material is arranged on the surface of the lithium cobalt oxide material, so that the first coulombic efficiency, the specific discharge capacity and the energy density of the battery are improved; and the first lithium cobalt oxide composite particles and the second lithium cobalt oxide composite particles with different particle sizes are selected for grading, so that the first charge-discharge capacity and the cycling stability of the material are improved, and the requirements of a high-performance lithium ion battery using a silicon-carbon negative electrode are met.

The invention discloses a lithium titanate battery, and relates to the technical field of batteries. The battery comprises a positive electrode, a negative electrode, an electrolyte and a diaphragm, and an addition product synthesized by dimethyl fumarate and benzidine according to a specific molar ratio is added into the electrolyte as a viscosity modifier, so that the viscosity increasing trend of the electrolyte at a low temperature is effectively reduced, and the migration rate of lithium ions is improved. And the electrolyte also comprises a lithium salt, an organic solvent and an auxiliary additive, so that the low-temperature performance and the cycling stability of the battery are favorably optimized. A positive active material is one or more of lithium iron phosphate, lithium manganate, lithium cobalt oxide or nickel manganese cobalt ternary materials, a negative active material is lithium titanate, and additives such as lithium nitrate and fluoroethylene carbonate are further combined, so that the capacity retention ratio and the charge-discharge efficiency of the battery in an extreme low-temperature environment of-40 DEG C are remarkably improved. The lithium titanate battery provided by the invention has excellent low-temperature adaptability, safety and long cycle life, and is applicable to power batteries and energy storage systems in alpine regions.

The invention provides a low-cost lithium cobalt oxide positive electrode material and a preparation method and application thereof.The preparation method comprises the steps that firstly, a cobalt source, a lithium source and a sodium source with Dv50 being 3-5 microns are subjected to dry mixing treatment, and a mixed material is obtained; secondly, the mixed material is subjected to high-temperature sintering treatment, and a sintered material is obtained; and finally, crushing and sieving the sintered material to obtain the low-cost lithium cobalt oxide positive electrode material with Dv50 of 16-21 [mu] m. According to the preparation method provided by the invention, a traditional large-particle cobalt source is replaced with a small-particle cobalt source, a sodium source is introduced as a functional additive, and a simple process of'dry mixing-high-temperature sintering-crushing and sieving 'is matched, so that the use amount of a lithium source does not need to be additionally increased in the preparation process, and the sintering temperature does not need to be increased; the cost is controlled in the whole process from raw material selection to process execution, so that the precursor purchase cost, the additional consumption cost of the lithium source and the high-temperature sintering energy consumption expenditure are remarkably reduced, and the multi-dimensional cost advantage is formed.

A secondary battery and an electronic apparatus. Specifically, the secondary battery comprises: a positive electrode, a negative electrode, and an electrolyte; the positive electrode comprises a positive electrode current collector and a positive electrode material provided on the positive electrode current collector; the positive electrode material comprises lithium cobalt oxide; the electrolyte comprises methylene methane disulfonate and propenyl-1,3-sultone; relative to 100 parts by mass of the electrolyte, the sum of methylene methane disulfonate and propenyl-1,3-sultone is 0.02 parts by mass to 3.5 parts by mass. The overcurrent and over-temperature safety of the secondary battery are improved.

The invention relates to an O2-phase lithium cobalt oxide positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: S1, uniformly mixing a doped metal source, a sodium source and a cobalt source, sintering, and cooling to obtain a P2-phase precursor; s2, uniformly mixing the P2-phase precursor, a lithium source A and the coating layer precursor, sintering, and cooling to obtain an intermediate A; s3, uniformly mixing the intermediate A and a lithium source B, sintering, and cooling to obtain an intermediate B; and S4, uniformly mixing the intermediate B and a lithium source C, sintering, cooling, washing and drying to obtain the O2-phase lithium cobalt oxide positive electrode material. The O2-phase lithium cobalt oxide positive electrode material with low residual sodium, high structural stability and excellent interface coating performance is prepared through a method of combining gradient ion exchange, gradient temperature control, gradient atmosphere regulation and control and synchronous in-situ coating.

The invention belongs to the technical field of positive electrode materials, and particularly relates to a coated modified lithium cobalt oxide positive electrode material as well as a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: 1) mixing and grinding lithium cobalt oxide and a metal oxide, and then carrying out first sintering to obtain a lithium cobalt oxide positive electrode material; (2) putting the lithium cobalt oxide positive electrode material obtained in the step (1) into a phosphorus source solution, carrying out first stirring impregnation, filtering and drying, and then putting the lithium cobalt oxide positive electrode material into a halide solution, carrying out second stirring impregnation, filtering and drying to obtain a pre-coated lithium cobalt oxide positive electrode material; and 3) carrying out secondary sintering and crushing on the pre-coated lithium cobalt oxide positive electrode material obtained in the step 2) to obtain the coated modified lithium cobalt oxide positive electrode material.The coated modified lithium cobalt oxide positive electrode material prepared by the method has high first efficiency and high cycle stability under high voltage.

The application provides a lithium cobaltate positive electrode material, a preparation method thereof and a lithium ion battery. The preparation method of the lithium cobaltate positive electrode material comprises the following steps: (1) mixing a large-particle-size cobalt precursor, a first small-particle-size cobalt precursor and a lithium source, and performing primary sintering to obtain large-particle-size primary sintered material; (2) mixing a second small-particle-size cobalt precursor and the lithium source, and performing primary sintering to obtain small-particle-size primary sintered material; and (3) mixing the large-particle-size primary sintered material in step (1) and the small-particle-size primary sintered material in step (2), and performing secondary sintering to obtain the lithium cobaltate positive electrode material. The preparation method provided by the application can significantly reduce the charge transfer impedance of the obtained lithium cobaltate positive electrode material, improve the lithium ion migration rate, and avoid the impedance increase problem caused by unreasonable grading; the influence of the material impedance on the battery performance is improved, and the battery performance is improved.

An object is to provide a method for manufacturing a positive electrode active material that achieves high powder properties and high load resistance (e.g., rate performance and output resistance) when used in a lithium-ion secondary battery, within a short manufacturing cycle time and at low cost. To perform heat treatment at temperatures lower than the melting point of magnesium fluorine, lithium fluoride is mixed to melt magnesium fluorine and modify the surface of lithium cobalt oxide powder. By mixing lithium fluoride, magnesium fluorine can be melted at a temperature lower than its melting point, and a positive electrode active material is formed utilizing this eutectic phenomenon.

The invention discloses a positive pole piece and a lithium ion battery, and belongs to the technical field of batteries. The positive pole piece comprises a positive current collector, a first active material layer stacked on the surface of at least one side of the positive current collector, and a second active material layer stacked on the surface of the first active material layer, the first active material layer is a lithium cobalt oxide material system with the charging cut-off voltage of 4.53 V; the second active material layer is a lithium cobalt oxide material system with the charging cut-off voltage of 4.55 V; the mass percent of the first active material layer is 98.5%-99.5%, and the mass percent of the second active material layer is 0.5%-1.5%. The positive pole piece and the lithium ion battery have the advantages of high energy density and high-temperature stability.

The invention provides a lithium-supplementing positive pole piece, a preparation method thereof and a lithium ion battery. The lithium-supplementing positive pole piece comprises a positive pole current collector and a positive pole active layer located on at least one side surface of the positive pole current collector, the positive pole active layer comprises a lithium cobalt oxide positive pole material, a binder, a conductive agent, a dispersant and a positive pole lithium-supplementing agent, and the conductive agent comprises a point-shaped conductive agent and a linear conductive agent. According to the lithium-supplementing positive pole piece disclosed by the invention, on the basis of not changing a battery cell structure, by adjusting component materials in the positive active layer, overall and interface Li < + > transfer kinetics is promoted, gas production can be reduced, and meanwhile, the first effect, the capacity, the cycle performance and the rate capability of a battery under high voltage can be improved; and the energy density of the battery can be improved.

The invention relates to the technical field of lithium ion batteries, in particular to a lithium cobalt oxide positive electrode material, a preparation method thereof and a lithium ion battery. The lithium cobalt oxide positive electrode material comprises a substrate and a coating layer, the base body comprises a first base body material and a second base body material; the coating layer comprises the following main components: Q-doped lithium cobalt oxide, phosphate and a Q compound, wherein Q comprises at least one of Mg, Ti, Y, Ga, Ge, Sn, Nb, Zr, Al, Sb, W, Sr, In, Ni, Mn, La and halogen elements; the single crystal degree of the lithium cobalt oxide positive electrode material is greater than or equal to 37%. By controlling the single crystal degree of the lithium cobalt oxide positive electrode material, the structure phase change, oxygen release and interface side reaction of the material under high pressure can be inhibited, and the cycle performance of the material is improved.

The application discloses a method for recycling waste lithium ion battery positive electrode material into nanoflower functional material, and relates to the technical field of battery recycling, which comprises the following steps: discharging and disassembling a recycled waste lithium cobalt oxide lithium battery to obtain a positive electrode sheet; performing heat treatment on the cleaned and dried positive electrode sheet to separate an aluminum foil and a positive electrode material; performing hydrothermal reaction on the obtained positive electrode material and formaldehyde solution; drying the obtained filter residue to obtain a transition metal oxide nanoflower functional material product rich in oxygen vacancies and active groups; and further performing precipitation, filtration and drying on the mother liquor to obtain lithium carbonate powder. The method has the advantages that the recycled positive electrode material and formaldehyde solution are subjected to hydrothermal reaction, the preparation of nanoflower functional material is realized, lithium carbonate is selectively recycled, and formaldehyde is efficiently degraded.

The invention relates to a trace O3 phase lithium cobalt oxide coated O2 phase lithium cobalt oxide positive electrode material as well as preparation and application thereof. The chemical formula of the lithium cobalt oxide positive electrode material is Li Na Co < 1-c > M < c > O < 2 >. N < LiCo < 1-c > M < c > O < 2 >, wherein 0 < = a < = 0.8, 0 < = b < = 0.1, 0 < = c < = 0.1, N is a molar ratio of an O3 phase to an O2 phase, and 0 < N < = 0.05; m comprises at least one of Ni, Mn, Al, Mg, Co, Cu, Ca, Zn, Zr, B, Nb, Fe, Cr, Y, La, Ce, Cd or Ti; wherein the lithium cobalt oxide positive electrode material has XRD diffraction characteristic peaks at the same time when 2 [theta] A1 is equal to 18.3 to 18.8 degrees, 2 [theta] A2 is equal to 37.9 to 38.4 degrees, 2 [theta] A3 is equal to 46.7 to 47.3 degrees and 2 [theta] B1 is equal to 18.9 to 19.3 degrees. The surface lithiation of the limited lithium source is combined with the topological phase change, and a trace O3 phase micro-configuration structure is constructed on the surface of the O2 phase lithium cobalt oxide positive electrode material in situ, so that the lithium cobalt oxide positive electrode material keeps high specific capacity, and meanwhile, the structural stability is remarkably improved.

A secondary battery that achieves higher conductivity of a positive electrode and has higher capacity is provided. The secondary battery includes a positive electrode that includes a positive electrode active material, a first conductive material, and a second conductive material whose shape is different from that of the first conductive material. The positive electrode active material includes lithium cobalt oxide containing magnesium in its surface portion. The weight of the second conductive material is lower than or equal to the weight of the first conductive material. The second conductive material forms an assembly and has a portion sticking to the positive electrode active material.

In order to solve the problem that the cycle life of a battery is short due to radial cracks generated by ion exchange stress in the existing O2-phase LCO preparation process, the invention provides an O2-phase lithium cobalt oxide positive electrode material and a preparation method thereof, a positive electrode plate and a lithium ion battery, the O2-phase lithium cobalt oxide positive electrode material comprises an inner core and a coating layer, the inner core is O2-phase LiyCoO2 with radial cracks, and the coating layer is coated on the outer surface of the inner core. Wherein y is in the range of 0.990 to 1.01; the outer surface of the inner core is covered with the coating layer, and the radial cracks are filled and covered with the coating layer; the coating layer comprises at least one alternating structure layer, the alternating structure layer comprises an Al2O3 layer and a TiO2 layer, the side, close to the center of the inner core, of the coating layer filled with the radial cracks is the Al2O3 layer, and the side, away from the inner core, of the coating layer is the TiO2 layer. According to the O2-phase lithium cobalt oxide positive electrode material provided by the invention, the coating layer forms an anchoring and sealing composite structure, so that the erosion of electrolyte is effectively relieved in the charge-discharge process, the dissolution of transition metal is reduced, and the cycle life of the battery is prolonged.

This invention provides a method for separating and recovering cobalt and lithium from waste lithium cobalt oxide battery cathode materials. The method includes: pretreating the waste lithium cobalt oxide battery cathode materials; adding the pretreated waste lithium cobalt oxide battery cathode materials to a eutectic solvent composed of D-fructose, tetrabutylammonium chloride, and boric acid, and heating to 60°C~80°C for leaching, obtaining a leaching slurry after leaching; filtering the leaching slurry, and cooling the filtered filtrate until liquid-liquid phase separation occurs, obtaining an upper lithium-rich water / alcohol phase and a lower cobalt-rich eutectic solvent phase; recovering lithium from the upper lithium-rich water / alcohol phase and cobalt from the lower cobalt-rich eutectic solvent phase. This invention constructs a eutectic solvent system composed of D-fructose / tetrabutylammonium chloride / boric acid, achieving for the first time an integrated operation of high-temperature homogeneous leaching and low-temperature spontaneous phase separation. The entire process achieves efficient and selective separation of lithium and cobalt without the need for additional extractants or precipitants.

The invention relates to the technical field of lithium ion battery materials, and discloses a double perovskite oxide coated ternary positive electrode material as well as a preparation method and application thereof. The invention provides a double-perovskite oxide coated ternary positive electrode material, which comprises a nickel manganese lithium cobalt oxide ternary positive electrode material and a coating layer coated on the surface of the nickel manganese lithium cobalt oxide ternary positive electrode material, the coating layer comprises a double-perovskite oxide, and the double-perovskite oxide comprises La2NiMnO6. The double perovskite oxide coated ternary positive electrode material provided by the invention has excellent cycle performance, excellent rate capability and voltage stability. The invention also provides a preparation method of the double perovskite oxide coated ternary positive electrode material, the preparation method is mild in condition and easy to amplify, and a solid technical basis is provided for manufacturing the positive electrode material of the lithium ion battery with high performance and long service life.

A lithium-ion battery, including a positive electrode, a negative electrode and a non-aqueous electrolyte. The positive electrode includes a positive electrode material layer; the positive electrode material layer includes a positive electrode active material, which includes a lithium cobalt oxide doped or coated with element aluminum; the non-aqueous electrolyte includes a non-aqueous organic solvent, a lithium salt and an additive; the additive includes a first additive and a second additive, the first additive includes a cyclic sultone, and the second additive includes a compound represented by structural formula 1:the lithium-ion battery meets the following requirements: 0.1≤a / c≤5; 0.3≤b / c≤20; and 0.2≤a≤1, 0.1≤b≤5, 0.1≤c≤5. The lithium-ion battery provided by the application has good high-temperature storage performance and high-temperature cycle performance, and is beneficial to prolonging the battery service life.

The invention discloses cobalt carbonate, a preparation method and application, the cobalt carbonate comprises a cobalt carbonate inner core and an aluminum-doped cobalt carbonate coating layer coating the cobalt carbonate inner core, and the pore volume of the cobalt carbonate inner core is smaller than that of the cobalt carbonate. The cobalt carbonate in the application has a synergistic effect between a gradient pore structure and gradient aluminum doping distribution, so that the problem that cobalt carbonate particles are easy to crack and remove powder during sintering is solved, the sintered cobaltosic oxide can be kept to have relatively excellent tap density and mechanical strength, and the electrochemical performance of lithium cobalt oxide is further improved.

1. Name of the product in this design: Atmosphere Rotary Kiln. 2. Application of this design: This design is used for the sintering of lithium iron phosphate, ternary lithium, lithium manganese oxide, lithium cobalt oxide, graphite, catalysts, powders, and granular materials. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention belongs to the technical field of lithium ion electrochemical devices, and provides a composite lithium cobalt oxide positive electrode material, a preparation method thereof and an electrochemical device. Particles of the composite lithium cobalt oxide positive electrode material are of a composite phase structure of an O2 phase and an O3 phase, and the O3 phase is generated by in-situ growth in the O2 phase. According to the composite lithium cobalt oxide positive electrode material disclosed by the invention, the O2 phase and the O3 phase have a co-lattice interface, so that the interface resistance is effectively reduced, the lithium ion transmission coefficient is improved, and the stress concentration in the compounding process of different phase structures is weakened, thereby improving the electrochemical performance of the battery.

The invention relates to a surface-reconstructed lithium cobalt oxide positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixing a sodium source, a cobalt source and an M1 source, and carrying out solid-phase sintering to obtain a P2-phase sodium cobaltate precursor; mixing the P2-phase sodium cobaltate precursor with a first lithium source, and generating a composite-phase lithium cobaltate material through a molten salt ion exchange reaction; the composite-phase lithium cobalt oxide material comprises T2-phase lithium cobalt oxide and O2-phase lithium cobalt oxide; dispersing the composite-phase lithium cobalt oxide material in an aqueous solution of a second lithium source, and performing liquid-phase lithium supplementation on the composite-phase lithium cobalt oxide material to obtain an O2-phase lithium cobalt oxide material; carrying out low-temperature acid treatment on the surface of the O2-phase lithium cobalt oxide material at 240 DEG C or below so as to neutralize surface alkaline residues and induce formation of a surface reconstruction layer with a disordered spinel phase and / or a rock salt phase, thereby obtaining the O2-phase lithium cobalt oxide positive electrode material with the reconstructed surface; the chemical general formula of the bulk phase structure of the O2-phase lithium cobalt oxide positive electrode material is Li < x > Co < 1-y > M < 1y > O < 2 >.

The invention discloses positive electrode slurry of a high-power long-cycle-performance lithium iron phosphate battery. The positive electrode slurry comprises the following components in parts by weight: 96-98 parts of a positive electrode main material, 0.8-1.2 parts of a conductive agent I, 1.90-1.97 parts of a positive electrode binder, 0.04-0.08 part of a dispersing agent and 44-46 parts of a positive electrode solvent, the positive electrode main material comprises a mixed main material of at least two positive electrode materials, and the positive electrode main material is selected from a combination of at least two of lithium iron phosphate I, lithium iron phosphate II, lithium cobalt oxide, lithium manganate, a ternary material and a lithium-rich manganese-based material. Compared with the prior art, the invention has the following beneficial effects: by establishing a multi-component composite system and cooperating with the synergistic effect of the components in the positive electrode slurry, a three-dimensional electron conduction network is formed, and the performance of the mixed positive electrode main material is synergistically improved, so that the mixed positive electrode main material has high cycle capacity retention rate and high energy density, the capacity retention rate is still kept at 97.16% after 600 cycles, and the power efficiency is kept at 96.20%; the retention rate reaches 91.31% after 2000 cycles, the technical bottleneck of the energy storage battery is solved, and the purposes of cost reduction and efficiency improvement of enterprises are met.

The application discloses a coated modified high-voltage lithium cobaltate positive electrode material, a preparation method thereof and a lithium ion battery. The coated modified high-voltage lithium cobaltate positive electrode material comprises a core and a coating layer arranged on the surface of the core, the core is lithium cobaltate, and the coating layer comprises a Li4P2O7-PrPO4 composite. The application realizes the interface stabilization of the high-voltage lithium cobaltate positive electrode material under the condition of 4.7 V by constructing a Li4P2O7-PrPO4 composite coating layer on the surface of the lithium cobaltate. The composite coating layer has ion conductivity and chemical inertia, and can effectively inhibit electrolyte decomposition, transition metal dissolution and lattice oxygen loss. The prepared material has higher capacity retention rate and cycle stability under high voltage, and significantly improves the electrochemical performance and safety of the high-energy-density lithium cobaltate positive electrode.