Positive electrodeactive material for lithium-ion secondary battery and lithium-ion secondary battery
Patent Information
- Application Number
- DE602020049242
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2020-06-30
- Publication Date
- 2025-04-09
- Estimated Expiration
- 2040-06-30
AI Technical Summary
Existing positive electrode active materials for lithium-ion secondary batteries, particularly those with high nickel ratios, face a trade-off between increased battery capacity and decreased thermal stability, necessitating a material that achieves high thermal stability at a lower cost.
A positive electrode active material comprising lithium-nickel-manganese composite oxide with a hexagonal layered structure, containing secondary particles with aggregated primary particles, and incorporating specific amounts of titanium and niobium. Niobium is segregated at the grain boundary between primary particles, and the material exhibits a high volume resistivity when compressed, enhancing thermal stability.
The proposed positive electrode active material achieves extremely high thermal stability at a lower cost, effectively suppressing oxygen release during overcharge and improving thermal runaway temperature, making it suitable for industrial-scale production.