Positive electrode active material for rechargeable lithium battery, method for preparing positive electrode active material, and rechargeable lithium battery including the same

By using a mixture of particles with the chemical formula Li1Mnz1Fex1Tiy1B1b1PO4-c1 and Li2Niz2Mnx2Oc2 as the positive electrode active material, a rechargeable lithium battery with high energy density and high conductivity was prepared, which solved the problems of insufficient energy density and low-temperature performance in the prior art and met the needs of electronic devices and electric vehicles.

CN120854549APending Publication Date: 2025-10-28SAMSUNG SDI CO LTD
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Patent Information

Application Number
CN202510509757.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2024-04-25
Filing Date
2025-04-22
Publication Date
2025-10-28

AI Technical Summary

Technical Problem

Existing rechargeable lithium batteries are inadequate in terms of energy density, operating voltage, and low-temperature performance, making it difficult to meet the needs of rapidly expanding electronic devices and electric vehicles.

Method used

A mixture of particles represented by the chemical formulas Li1Mnz1Fex1Tiy1B1b1PO4-c1 and Li2Niz2Mnx2Oc2 is used as the positive electrode active material. The particle ratio and viscosity are controlled by spray drying and baking to form a positive electrode active material layer with high conductivity.

Benefits of technology

The energy density and operating voltage of rechargeable lithium batteries are improved, the low-temperature performance is enhanced, and the requirements for high energy density and high conductivity are met.

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Abstract

A positive electrode active material for a rechargeable lithium battery, a method for preparing the positive electrode active material, and a rechargeable lithium battery including the positive electrode active material are provided. The positive electrode active material includes: a first particle including a compound represented by Lia1Mnz1Fex1Tiy1B1b1PO4-c1 and having a first average particle diameter; and a second particle including a compound represented by Lia2Niz2Mnx2C1y2Oc2 and having a second average particle diameter. The amount of the first particles is from about 80 wt% to about 97.5 wt% based on a sum of 100 wt% of the amount of the first particles and the amount of the second particles.
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