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Positive electrode material as well as preparation method and application thereof

A technology of positive electrode materials and additives, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of low post-treatment temperature and unsatisfactory coating effect, reduce oxygen release, improve cycle stability, and reduce interface The effect of impedance

Pending Publication Date: 2022-07-22
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Publication number is that the Chinese patent of CN111342050A discloses containing LPF 6 The polymer solid electrolyte coating positive electrode material scheme, but it has not been sintered so that LPF 6 Decomposition; the Chinese patent whose publication number is CN107706377B contains LPF to the positive pole 6 The polymer electrolyte coating, followed by calcination to obtain a core-shell structure composite positive electrode, but the layered oxide positive electrode material is easy to react with the polymer electrolyte at high temperature, so the post-treatment temperature is low, this ex-situ Coverage may not be ideal

Method used

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  • Positive electrode material as well as preparation method and application thereof
  • Positive electrode material as well as preparation method and application thereof
  • Positive electrode material as well as preparation method and application thereof

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preparation example Construction

[0050] The present invention also provides a method for preparing the above positive electrode material, comprising the following steps: S1) mixing the positive electrode material matrix, additive A and additive B to obtain a mixture; S2) calcining the mixture to obtain a positive electrode material.

[0051] Among them, the present invention has no special restrictions on the sources of all raw materials, which can be commercially available or homemade; the types and proportions of the positive electrode material matrix, additive A and additive B are the same as those described above, and will not be repeated here; The average particle size of the positive electrode material matrix is ​​preferably 30 to 50000 nm, more preferably 0.1 to 50 μm, and further preferably 0.15 to 20 μm; 22 μm; the average particle size of the additive A is preferably 5-30000 nm; in the embodiments provided by the present invention, the average particle size of the additive A is specifically 1100 nm, ...

Embodiment 1

[0059] The positive electrode material matrix adopts a sample (NCM811) of nickel cobalt lithium manganate (nickel: cobalt: manganese = 8: 1: 1) with D50 of about 12 μm;

[0060] Lithium difluorophosphate (average particle size: 1100nm), lithium phosphate (average particle size: 130nm), and NCM811 were uniformly mixed in a mixer according to a mass ratio of 0.5:0.2:100, and then heat-treated at 350°C for 12h in an oxygen atmosphere. A positive electrode material A1 was obtained.

[0061] The positive electrode material obtained in Example 1 was analyzed using a scanning electron microscope, and its scanning electron microscope photo was obtained as follows: figure 1 shown.

Embodiment 2

[0063] The cathode material matrix adopts NCM811 sample with D50 of about 12μm;

[0064] Lithium difluorophosphate (average particle size: 1100 nm), lithium lanthanum zirconate (average particle size: 200 nm), and NCM811 were added to 100 parts of ethanol in a ratio of 0.5:0.9:100 by mass, stirred evenly, and dried at 70°C , the dried material was heat-treated at 400° C. in an oxygen atmosphere for 5 h to obtain a positive electrode material A2.

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Abstract

The invention provides a positive electrode material. Compared with the prior art, the compound containing the fluorine element and the phosphorus element is selected, a composite coating layer can be formed on the surface of the positive electrode material matrix in the heat treatment process, and the coating layer formed by fluorine and phosphorus can correspondingly stabilize the structure of the material; meanwhile, the surface-coated solid electrolyte material containing fluorine and phosphorus has excellent ionic conductivity and stability, the electrical property of the material can be improved, the uniformity of the fluorine-phosphorus-containing coating layer formed on the surface is better, the consistency of interface impedance and compatibility is ensured, and the surface structure has better stability in the charging and discharging process.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive electrode material, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have developed rapidly due to their high energy density, long cycle life, wide operating temperature range, and no memory effect. The requirements for the energy density of secondary lithium-ion batteries with high energy density and high safety are getting higher and higher, and the development and modification of cathode materials are also increasing. At present, commercial cathode materials still cannot meet the requirements of the market, so improving energy density, cycle stability, and safety has become an important and urgent indicator for lithium-ion batteries. [0003] Coating means is widely used as an important means of modifying cathode materials at present. At present, the most widely used coating scheme is to coa...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525H01M10/054
CPCH01M4/366H01M4/5825H01M4/628H01M10/0525H01M10/054H01M2004/028Y02E60/10
Inventor 董彬彬杨琪俞会根
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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