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Title:
COBALT-FREE POSITIVE ELECTRODE MATERIAL, PREPARATION METHOD THEREFOR AND APPLICATION THEREOF
Document Type and Number:
WIPO Patent Application WO/2022/199350
Kind Code:
A1
Abstract:
Provided is a method for preparing a cobalt-free positive electrode material, the method comprising the following steps: (1) mixing lithium titanate and a metal source, carrying out a primary sintering treatment, adding a carbon source, and carrying out a secondary sintering treatment to obtain a carbon-coated, metal-doped lithium titanate additive; (2) mixing a lithium source with a cobalt-free precursor, and performing a high-temperature treatment to obtain a substrate material; and (3) mixing the carbon-coated, metal-doped lithium titanate additive with the substrate material, and then performing a heat treatment to obtain a cobalt-free positive electrode material. Further provided are a cobalt-free positive electrode material prepared by means of the preparation method, a positive electrode sheet including the positive electrode material, and a lithium-ion battery including the positive electrode sheet. In the preparation method, the doped lithium titanate is used to improve the conductivity of a material. In addition, the lithium titanate material is a zero-strain material, and the cycle performance of the material can be improved after the cobalt-free positive electrode material is coated.

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Inventors:
XU XINPEI (CN)
JIANG WEIJUN (CN)
CHEN SIXIAN (CN)
ZHENG XIAOXING (CN)
Application Number:
PCT/CN2022/079067
Publication Date:
September 29, 2022
Filing Date:
March 03, 2022
Export Citation:
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Assignee:
SVOLT ENERGY TECH CO LTD (CN)
International Classes:
C01G53/00; H01M4/131; H01M4/36; H01M4/505; H01M4/525; H01M4/62; H01M10/0525
Foreign References:
CN113060775A2021-07-02
CN111435744A2020-07-21
CN109671944A2019-04-23
CN104425809A2015-03-18
CN101000960A2007-07-18
CN105870437A2016-08-17
CN106450264A2017-02-22
CN107528057A2017-12-29
CN106252644A2016-12-21
CN104218241A2014-12-17
JP2012204177A2012-10-22
Attorney, Agent or Firm:
BEYOND ATTORNEYS AT LAW (CN)
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