LITHIUM ION BATTERY

WIPO Patent Application WO/2023/137878

A1

For overcoming the problem of insufficient cycle performance of an existing high-voltage lithium ion battery, the present invention provides a lithium ion battery, comprising a positive electrode containing a positive electrode material layer, a negative electrode and a non-aqueous electrolyte. The positive electrode material layer comprises a positive electrode active material; the positive electrode active material comprises LixNiyCozM1-y-zO2, M being at least one element selected from Mn and Al; the positive electrode active material is doped or coated with an element E, the element E being one or more selected from Ba, Zn, Ti, Mg, Zr, W, Y, Si, Sn, B, Co and P; the potential range of the positive electrode active material relative to metal lithium is greater than or equal to 4.25 V. The non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additive comprising a compound represented by structural formula 1. The lithium ion battery satisfies the following conditions: 0.1≤(H/T)×M/1000≤10, wherein 80≤H≤150, 0.005≤T≤0.8 and 0.05≤M≤3. The lithium ion battery provided by the present invention has relatively low battery impedance and excellent high-temperature cycle performance.

QIAN YUNXIAN (CN)
HU SHIGUANG (CN)
DENG YONGHONG (CN)
LI HONGMEI (CN)
XIANG XIAOXIA (CN)

PCT/CN2022/085251

July 27, 2023

April 06, 2022

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SHENZHEN CAPCHEM TECHNOLOGY CO LTD (CN)

H01M10/0567; H01M4/525

CN114094109A	2022-02-25
CN114068936A	2022-02-18
JP2015176760A	2015-10-05
JP2016004751A	2016-01-12
JP2017199548A	2017-11-02
JP2018092778A	2018-06-14
CN111403807A	2020-07-10
CN111755753A	2020-10-09

SHENZHEN ZHONGDING INTELLECTUAL PROPERTY AGENCY (CN)

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