Positive electrode active material, preparation method thereof and lithium secondary battery comprising the same

By using a doped metal structure in the positive electrode active material of the lithium secondary battery with a doped metal, and alternately aligning the lithium layer and the transition metal-substituted lithium layer to form a superlattice, the problem of shortening the life of the positive electrode active material of the lithium secondary battery is solved, and the battery performance with high energy density and long life is achieved.

CN112534609BActive Publication Date: 2025-05-09辰星锂电
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Patent Information

Application Number
CN201980017019.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2018-01-12
Filing Date
2019-01-14
Publication Date
2025-05-09
Estimated Expiration
2039-01-14

AI Technical Summary

Technical Problem

The positive electrode active material of existing lithium secondary batteries has shortened its life when the number of charge/discharge increases, and its capacity and stability are insufficient, making it difficult to meet the needs of high energy density and long life.

Method used

A positive electrode active material with doped metals is used to doped metals with a compound containing lithium, transition metals and oxygen. The pure lithium layer and transition metal-substituted lithium layer are alternately arranged in the lithium layer to form a superlattice structure, and a positive electrode active material with high stability is prepared by calcination during the preparation process.

Benefits of technology

It significantly improves the charging/discharge capacity and life of lithium secondary batteries, reduces the impact of the number of charge/discharge times on battery life, and improves the stability and energy density of the battery.

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Abstract

The present invention provides a positive electrode active material in which a compound containing lithium, a transition metal and oxygen is doped with a doping metal, the positive electrode active material comprising a lithium (Li) layer, wherein the lithium layer may include a first lithium layer comprising only lithium and a second lithium layer in which at least a portion of the lithium in the first lithium layer is replaced by a transition metal.
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Citation Information

Patent Citations

  • Precusor for lithium rich active material and lithium rich active material made by the same

    KR1020140119621A

  • Positive electrode active material for non-aqueous electrolyte secondary battery, manufacturing method thereof, and non-aqueous electrolyte secondary battery using the positive electrode active material

    US20060194114A1

  • Electrode material for positive electrodes of rechargeable lithium batteries

    US6998069B1