Non-aqueous electrolyte, non-aqueous electrolyte secondary battery including the non-aqueous electrolyte, and compound
By incorporating a specific metal complex salt with a monofluorophosphate moiety into the nonaqueous electrolyte of secondary batteries, the issues of gas generation and internal resistance during high-temperature storage are addressed, leading to improved battery durability and performance.
Patent Information
- Application Number
- JP2021051171
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2021-03-25
- Publication Date
- 2025-03-19
- Estimated Expiration
- 2041-03-25
AI Technical Summary
Nonaqueous electrolyte secondary batteries, particularly those used in electric vehicles, face challenges in reducing gas generation and internal resistance during high-temperature storage. Existing electrolytes, such as those with difluorophosphate components, are not stable at high temperatures and do not effectively form a solid electrolyte interphase (SEI) with the negative electrode.
Incorporating a specific metal complex salt represented by formula (I) into the nonaqueous electrolyte, which contains a monofluorophosphate moiety and optionally a boron fluoride moiety. This complex salt reacts with the positive electrode to form a high-Li conductivity electrode coating, reducing interfacial resistance and suppressing electrolyte decomposition. Additionally, it forms a strong SEI on the negative electrode during charging and discharging, reducing gas generation.
The proposed solution significantly suppresses gas generation and reduces internal resistance during high-temperature storage, thereby enhancing the storage durability and performance of nonaqueous electrolyte secondary batteries.