High-voltage lithium cobaltate positive electrode material, preparation method thereof and lithium-ion secondary battery

A high-voltage lithium cobalt oxide and cathode material technology, applied in the field of electrochemical energy storage, can solve problems such as many processes and poor interface stability, and achieve the effects of improving safety performance, inhibiting phase transition, and improving cycle performance
CN110299518AInactive Publication Date: 2019-10-01XIAMEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAMEN UNIV
Publication Date
2019-10-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a high-voltage lithium cobaltate positive electrode material, a preparation method thereof and a lithium-ion secondary battery. The high-voltage lithium cobaltate positive electrode material is a multi-stage core-shell structure and comprises a lithium cobaltate core layer of an alpha-NaFeO2 structure, a composite doped layer and a functional shell layer from the inside to the outside, the general formula of the high-voltage lithium cobaltate positive electrode material is LiCoO2.D-LiCo1-xMxO2.S-Li-La-X-O, x is larger than or equal to 0.01 and smaller than or equal to 0.06, M is one or more elements in the group consisting of Al, Ti, Zr, La, Nb and rare earth elements, and X is one or more elements in the group consisting of Zr, Nb, Sc and Ga. According to the invention, through the high-temperature sintering of the lithium cobaltate core layer coated with the functional shell layer, the material of the functional shell layer is doped into a lithium cobaltate surface layer, therefore, the structure of lithium cobaltate is stabilized, the phase change of the lithium cobaltate in a high-voltage discharge process is inhibited, and the cycle performance and rateperformance are improved.
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Description

technical field

[0001] The invention relates to the technical field of electrochemical energy storage, and in particular to a high-voltage lithium cobalt oxide cathode material, a preparation method and a lithium ion secondary battery. Background technique

[0002] As a representative secondary battery, lithium ion battery is a general term for batteries with lithium ion intercalation compounds as positive and negative electrode materials. Its working principle is that during the charging process of the battery, lithium ions are intercalated and extracted back and forth between the positive and negative electrode materials, which is vividly called "rocking chair battery".

[0003] Lithium cobalt oxide (LiCoO 2 ) is the earliest commercial lithium-ion battery cathode material. Its excellent cycle stability, rate performance and compaction density make it still occupy a large share of the consumer electronics energy storage market. LiCoO 2 Since its discovery, its applicati...

Claims

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