Positive electrode active material, positive electrode plate, and non-aqueous electrolyte secondary battery
The use of a positive electrode active material with tailored first and second particles and coating layers addresses the challenge of gas generation and capacity retention in non-aqueous electrolyte secondary batteries under high temperatures, improving battery performance and energy density.
JP2025165059APending Publication Date: 2025-11-04PRIME PLANET ENERGY & SOLUTIONS INC
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Patent Information
- Application Number
- JP2024068913
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-04-22
- Publication Date
- 2025-11-04
AI Technical Summary
Technical Problem
Non-aqueous electrolyte secondary batteries face challenges in maintaining excellent cycle characteristics and suppressing gas generation under high-temperature conditions.
Method used
A positive electrode active material comprising first and second active materials with specific particle sizes and sphericities, along with coating layers, is used to form a dense active material layer that evenly distributes compressive force, reducing stress and gas generation.
Benefits of technology
The active material suppresses gas generation and maintains capacity retention rate under high-temperature conditions, enhancing the battery's performance and energy density.
✦ Generated by Eureka AI based on patent content.
Abstract
To provide a positive electrode active material that can suppress gas generation during storage of a non-aqueous electrolyte secondary battery and can suppress a decrease in the capacity retention rate when the non-aqueous electrolyte secondary battery is repeatedly used under high-temperature conditions.SOLUTION: A positive electrode active material includes a first active material having an average particle diameter (D50) of 2 to 10 μm and a second active material having an average particle diameter (D50) of 12 to 20 μm. The first active material includes first particles that are at least one of single particles and secondary particles formed by agglomeration of 2 to 10 primary particles, and are made of a lithium transition metal composite oxide. The second active material includes second particles that are secondary particles formed by agglomeration of 50 or more primary particles, and are made of a lithium transition metal composite oxide. The sphericity of the second active material is 0.770 to 0.810.SELECTED DRAWING: None
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