FLUORINE-DOPED LITHIUM POSITIVE ELECTRODE MATERIAL, PREPARATION METHOD THEREFOR AND USE THEREOF

Title:

FLUORINE-DOPED LITHIUM POSITIVE ELECTRODE MATERIAL, PREPARATION METHOD THEREFOR AND USE THEREOF

Document Type and Number:

WIPO Patent Application WO/2022/237110

Kind Code:

A1

Abstract:

Provided in the present invention are a fluorine-doped lithium positive electrode material, a preparation method therefor and the use thereof. The preparation method comprises: step S1, mixing and reacting NH4F, LixNiyMnzO2 and water to obtain an intermediate product system, which comprises fluorine-modified LixNiyMnzO2; and step S2, carrying out first calcination on the fluorine-modified LixNiyMnzO2 in a first oxygen-containing gas, so as to obtain a fluorine-doped lithium positive electrode material, wherein x = 1 to 1.3, y = 0.1 to 0.9, z = 0.1 to 0.9, and x : (y + z) = 1.4 to 1.6. Doping with fluorine in a positive electrode material results in the oxygen in the material being protected by fluorine, such that the primary efficiency of a lithium-ion battery is effectively improved. In addition, the fluorine content of the fluorine-doped lithium positive electrode material within the above range can better ensure the structural integrity of the material, and thus ensure the advantages of high primary efficiency, a good cycling performance and a good rate capability.

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Inventors:

WANG PENGFEI (CN)
YANG HONGXIN (CN)
LI ZITAN (CN)
QIAO QIQI (CN)
SHI ZETAO (CN)
GUO FENG (CN)
XU XINPEI (CN)

Application Number:

PCT/CN2021/131509

Publication Date:

November 17, 2022

Filing Date:

November 18, 2021

Export Citation:

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Assignee:

SVOLT ENERGY TECH CO LTD (CN)

International Classes:

C01G53/00; H01M4/505; H01M4/525; H01M10/0525

Foreign References:

CN112919554A	2021-06-08
CN102368545A	2012-03-07

Other References:

HUANG DIANHUA: "Effect of NH4F treatment on the performance of LiNi0.8Co0.1Mn0.1O2", DIANCHI - BATTERY MONTHLY, HUNAN QINGGONG YANJIUSUO, CHANGSHA, CN, vol. 49, no. 4, 31 August 2019 (2019-08-31), CN , pages 318 - 320, XP093005019, ISSN: 1001-1579, DOI: 10.19535/j.1001-1579.2019.04.013

Attorney, Agent or Firm:

KANGXIN PARTNERS, P.C. (CN)

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