Non-aqueous electrolyte and lithium ion battery
CN118472377BActive Publication Date: 2026-08-28SHENZHEN CAPCHEM TECH CO LTD
Patent Information
- Application Number
- CN202310090783.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-02-09
- Publication Date
- 2026-08-28
- Estimated Expiration
- 2043-02-09
AI Technical Summary
Technical Problem
[0004]针对现有锂离子电池难以兼顾高温性能和低温性能的问题，本发明提供一种非水电解液及锂离子电池
Benefits of technology
[0034]根据本发明提供的非水电解液，加入了结构式1所示的化合物作为添加剂，其特殊的含有环状碳酸酯或环状亚硫酸酯的磷酸酯锂盐结构不仅能在正极形成特殊的CEI膜，同时在负极也能形成SEI膜，形成的CEI膜会与正极活性材料形成导离子界面网络，保护正极活性材料与非水电解液的直接接触，屏蔽金属离子溶出，通过界面协同效应强化正极活性材料的结构，同时弱化正极活性材料与非水电解液间的界面阻抗，使锂离子电池具有良好的倍率性能、高温存储性能和高温循环性能。同时形成的SEI膜阻抗更小，离子电导率更高，同时更加稳定，减少充电过程中负极的极化，抑制锂离子的析出，这是其成膜电位早使得其优于其它的有机添加剂成膜，使锂离子电池具有良好的低温倍率性能、高温存储性能和高温循环性能。
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN118472377B_ABST
Abstract
In order to overcome the problem that the existing lithium ion battery is difficult to consider high temperature performance and low temperature performance, the application provides a non-aqueous electrolyte, which comprises a lithium salt, an additive and an organic solvent, the additive comprises a compound shown in structural formula 1: wherein R1 and R2 are each independently selected from a cyclic carbonate group and a derivative thereof, a cyclic sulfite group and a derivative thereof or a cyclic sulfate group and a derivative thereof, n and m are each independently selected from any natural number of 0-3, and the content of ethanol in the non-aqueous electrolyte is 1-200 ppm. Meanwhile, the application also discloses a lithium ion battery comprising the non-aqueous electrolyte. The compound shown in structural formula 1 provided by the application can not only form a special CEI film at the positive electrode, but also form a SEI film at the negative electrode, so that the lithium ion battery has good low temperature rate performance, high temperature storage performance and high temperature cycle performance.
Need to check novelty before this filing date? Find Prior Art
Citation Information
Patent Citations
Nonaqueous secondary battery
JP2000123867A
Nonaqueous electrolyte solution for secondary batteries and secondary battery provided with same
CN107408732A
Electrolyte solution, electrochemical device, lithium ion secondary battery and module
CN111247681A
Non-aqueous electrolyte and battery
CN115602923A