Title:
GRADIENT TERNARY POSITIVE ELECTRODE MATERIAL, PREPARATION METHOD THEREFOR AND USE THEREOF
Document Type and Number:
WIPO Patent Application WO/2024/031911
Kind Code:
A1
Abstract:
Provided in the present application are a gradient ternary positive electrode material, a preparation method therefor and the use thereof. The preparation method comprises the following steps: (1) mixing a nickel source and a manganese source with a solvent to obtain a solution A, mixing a cobalt source and a solvent to obtain a solution B, adding the solution A, liquid caustic soda and ammonia water into a base solution at the same time for a reaction, and after the particle D50 reaches 5-8 μm, changing solution A to solution B and continuing the reaction to obtain a cobalt-coated nickel-manganese binary precursor; and (2) mixing the cobalt-coated nickel-manganese binary precursor with a lithium source, then carrying out sintering treatment to obtain an inner-core material, and by means of taking a liquid organic matter as a carbon source, coating the surface of the inner-core material with graphene by using an atomic layer deposition method, so as to obtain the gradient ternary positive electrode material. The concentration of cobalt metal in the gradient ternary positive electrode material gradually increases from inside to outside, so that the rate capability and structural stability of the material are improved; the single-layer graphene coating improves the rate capability and cycle performance of the material to the maximum extent.
Inventors:
LI CONG (CN)
ZHANG KUN (CN)
HUA WENCHAO (CN)
XU KAIHUA (CN)
XUE XIAOFEI (CN)
FAN LIANGJIAO (CN)
LI XUEQIAN (CN)
JIA DONGMING (CN)
GONG ZHENGJIE (CN)
YANG XING (CN)
ZHANG KUN (CN)
HUA WENCHAO (CN)
XU KAIHUA (CN)
XUE XIAOFEI (CN)
FAN LIANGJIAO (CN)
LI XUEQIAN (CN)
JIA DONGMING (CN)
GONG ZHENGJIE (CN)
YANG XING (CN)
Application Number:
PCT/CN2022/140379
Publication Date:
February 15, 2024
Filing Date:
December 20, 2022
Export Citation:
Assignee:
JINGMEN GEM CO LTD (CN)
GEM CO LTD (CN)
GEM CO LTD (CN)
International Classes:
H01M4/36
Foreign References:
| CN115360332A | 2022-11-18 | |||
| CN109987647A | 2019-07-09 | |||
| CN111628149A | 2020-09-04 | |||
| CN112750999A | 2021-05-04 | |||
| CN103121670A | 2013-05-29 | |||
| CN113060773A | 2021-07-02 | |||
| US20200106089A1 | 2020-04-02 |
Attorney, Agent or Firm:
BEYOND ATTORNEYS AT LAW (CN)
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