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Positive active material, preparation method thereof, positive electrode and battery

A positive active material and positive electrode technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor battery conductivity and stability

Pending Publication Date: 2019-10-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After testing, it is found that the above-mentioned electrode or positive electrode material is used in a battery, and the conductivity and stability of the battery are poor.

Method used

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  • Positive active material, preparation method thereof, positive electrode and battery
  • Positive active material, preparation method thereof, positive electrode and battery
  • Positive active material, preparation method thereof, positive electrode and battery

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Experimental program
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preparation example Construction

[0032] The present application also provides a method for preparing a positive electrode active material, wherein the method includes:

[0033] S1, the core material, carbon source and metal carbide are mixed and ground to obtain a precursor, the core material includes a lithium salt, and the lithium salt is selected from LiFeBO 3 , Li 2 FeSiO 4 , Li 5 FeO 4 , Li 6 CoO 4 , Li 6 MnO 4 , Li 2 NiO 2 and Li 2 CuO 2 one or more of

[0034] S2, drying the precursor prepared in S1, sintering at high temperature under an inert atmosphere, and cooling to obtain a positive electrode active material.

[0035] In the above preparation method, the in-situ carbon generated by the carbon source at high temperature can tightly cover the surface of the lithium salt, improve the conductivity of the lithium salt, and also protect the lithium salt; It can enter the lithium salt lattice at the lithium salt interface, and a small amount of metal ions in the lithium salt can be replaced...

Embodiment approach

[0052] Wherein, the separator can be selected from various separators used in lithium-ion batteries known to those skilled in the art, such as polyolefin microporous membrane (PP), polyethylene felt (PE), glass fiber felt or ultrafine glass fiber paper or PP / PE / PP. As a preferred embodiment, the separator is PP / PE / PP.

[0053] The preparation method of the lithium-ion battery provided by the present invention can be a method known to those skilled in the art. Generally speaking, the method includes winding the positive pole, the negative pole and the separator between the positive pole and the negative pole in sequence to form a pole core, and The pole core is put into the battery case, filled with electrolyte, and then sealed, wherein the winding and sealing methods are well known to those skilled in the art. The amount of electrolyte used is conventional. The electrolyte can also be replaced by one of all solid electrolytes, solid electrolytes or gel electrolytes.

[005...

Embodiment 1

[0057] LiFeBO with an average particle size of 100 nm 3 , glucose, and TiC nanoparticles with an average particle size of 2nm were mixed according to the mass ratio of 90:15:7, placed in a stirring ball mill, added ethanol, and wet mixed and ground for 6 hours; the precursor prepared by fully mixing and grinding was dried and placed in In a corundum crucible; put the crucible into a tube furnace, feed Ar gas, and start heating from room temperature at a heating rate of 5°C / min, then raise the temperature to 600°C and bake for 15h, then cool naturally to room temperature to obtain a carbon content of 3wt %, LiFeBO with a TiC content of 7wt% 3 / C+TiC composite, denoted as C1, in which the carbon and metal carbide coating has a thickness of 3 nm. The C1 sample was exposed to air for 1 day, and the obtained sample was marked as S1.

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Abstract

The present invention provides a positive active material comprising a core material and a coating layer. The core material comprises a lithium salt which is one or more selected from the group consisting of LiFeBO3, Li2FeSiO4, Li5FeO4, Li6CoO4, Li6MnO4, Li2NiO2 and Li2CuO2. The coating layer coats the core material and comprises carbon and metal carbide. The invention also provides a positive electrode containing the positive active material and a lithium-ion battery, the coating layer of the positive active material can isolate the influence of water in the air on the core material, the stability and conductivity of the material are improved, and the electrical conductivity and stability of the battery are improved.

Description

technical field [0001] The invention relates to the field of positive electrode active materials, in particular to a positive electrode active material, a preparation method, a positive electrode and a battery. Background technique [0002] The prior art is disclosed, LiFeBO 3 / C composite lithium-ion battery cathode material, LiFeBO coated with carbon on the surface 3 with LiFeBO 3 Compared with that, its rate performance and cycle performance have been improved. [0003] The prior art provides an electrode whose impedance increases with temperature, including a mixture of active materials, carbon materials, and metal carbides. Because of its electronically conductive material containing resin, carbon materials, and metal carbides, its impedance increases with temperature. increase together. [0004] After testing, it is found that the above-mentioned electrode or positive electrode material is applied in a battery, and the conductivity and stability of the battery are ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/625H01M4/364H01M4/485H01M4/525H01M4/505H01M10/0525H01M4/62Y02E60/10
Inventor 焦晓朋李世彩
Owner BYD CO LTD
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