Positive electrode active material for lithium secondary battery, positive electrode for lithium secondary battery, and lithium secondary battery

By adding barium sulfate to the positive electrode active material of lithium secondary batteries and controlling its content and particle size specific surface area, the problem of gas generation during the charging process of lithium secondary batteries is solved, and lithium secondary batteries with longer life and higher output characteristics are achieved.

CN120752760APending Publication Date: 2025-10-03SUMITOMO METAL MINING CO LTD
View PDF 6 Cites 0 Cited by

Patent Information

Application Number
CN202480014326.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-02-28
Filing Date
2024-02-27
Publication Date
2025-10-03

AI Technical Summary

Technical Problem

During the charging process of lithium secondary batteries, it is difficult to effectively suppress the generation of gas with existing technologies, resulting in a shortened lifespan of the lithium secondary batteries.

Method used

A positive electrode active material for lithium secondary batteries containing lithium metal composite oxide and barium sulfate is used. By controlling the content and particle size specific surface area of ​​barium sulfate, the reaction between hydrofluoric acid and lithium carbonate is inhibited, reducing gas generation.

Benefits of technology

The invention effectively suppresses the gas generation of lithium secondary batteries during the charging process, prolongs the battery life and improves the output characteristics of the battery.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN120752760A_ABST
    Figure CN120752760A_ABST
Patent Text Reader

Abstract

The positive electrode active material for a lithium secondary battery contains a lithium metal composite oxide and barium sulfate, and the lithium metal composite oxide is represented by formula (1). Li [Lia (Ni (1-b-c) M1bM2c) 1-a] O2 (1) (In formula (1), M1 is at least one element selected from Co, Mn and Al, M2 is at least one element selected from Ti, Zn, Zr, Mg, Ca, B, Si, Nb, W, Mo, Ta and P, and formula (1) satisfies-0.1 < = a < = 0.2, 0lt; b < = 0.4, 0 < = c < = 0.4, and 0 lt; b + c < = 0.4. )
Need to check novelty before this filing date? Find Prior Art

Claims

1. A positive electrode active material for a lithium secondary battery, wherein: comprising a lithium metal composite oxide and barium sulfate, the lithium metal composite oxide being represented by the following formula (1), Li[Li a (Nor (1-b-c) M1 b M2 c ) 1-a ]O2(1) In the formula (1), M1 is at least one element selected from Co, Mn, and Al, M2 is at least one element selected from Ti, Zn, Zr, Mg, Ca, B, Si, Nb, W, Mo, Ta, and P, and the formula (1) satisfies -0.1 ≤ a ≤ 0.2, 0 < b ≤ 0.4, 0 ≤ c ≤ 0.4, and 0 < b + c ≤ 0.

4.

2. The positive electrode active material for lithium secondary batteries according to claim 1, wherein The total amount of the barium sulfate is 0.01 mol% or more and 3.0 mol% or less relative to the total amount of the positive electrode active material for the lithium secondary battery.

3. The positive electrode active material for lithium secondary batteries according to claim 1 or 2, wherein The BET specific surface area of ​​the positive electrode active material for lithium secondary batteries is 2.0 m 2 / g or less.

4. The positive electrode active material for lithium secondary batteries according to claim 1 or 2, wherein The average particle size B of the barium sulfate is 1.0 or less with respect to the average particle size A of the lithium metal composite oxide, i.e., B / A.

5. The positive electrode active material for lithium secondary batteries according to claim 1 or 2, wherein The pH at 25°C of the solution obtained by mixing the positive electrode active material for the lithium secondary battery and water at a mass ratio of 1:1 and filtering is 12.5 or less.

6. A positive electrode for a lithium secondary battery, wherein: comprising the positive electrode active material for the lithium secondary battery according to claim 1 or 2.

7. A lithium secondary battery, wherein: comprising the positive electrode for the lithium secondary battery according to claim 6.

Citation Information

Patent Citations

  • High density nickel hydroxide coprecipitated with cobalt and manganese, and method for producing the same

    JP2002201028A

  • Bipolar battery and its control method

    JP2004095400A

  • Lithium transition metal compound powder, its production method, spray dried product being baking precursor of the powder, positive electrode for lithium secondary battery using the product, and lithium secondary battery

    JP2008305777A

  • Communication device, communication method and integrated circuit

    JP2023029623A

  • Lithium metal composite oxide powder, positive electrode active substance for lithium secondary battery, positive electrode, and lithium secondary battery

    WO2019177032A1