接口结构的几何设计和电解质溶解化学用于快速充电的离子电池
Chaeeun Song1, Seung Hee Han1, Youngwoo Choi2
1Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro Yuseong-gu, Daejeon, 34141, Republic of Korea.
Advanced materials (Deerfield Beach, Fla.)
|March 11, 2025
概括
修改电解质溶解结构可以使较小的固体电解质间相 (SEI) 粒,改善离子运输和离子电池 (LIB) 的快速充电. 这提高了运输应用的循环稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 电池技术 电池技术
背景情况:
- 固体电解质间相 (SEI) 颗粒大小和电解质溶解结构在离子电池 (LIB) 快速充电期间极大地影响离子 (Li+) 运输和溶解动力学.
- SEI粒度几何学对LIB快速充电性能的具体影响仍未得到充分研究.
研究的目的:
- 为了研究SEI颗粒大小和LIBs快速充电特征之间的关系.
- 通过改变电解质溶解结构来控制溶解动力学,以改善快速充电.
- 为了提高LIBs的快速充电能力和循环稳定性,用于运输应用.
主要方法:
- 探索SEI颗粒大小与快速充电性能之间的相关性.
- 电解质溶解结构的修改,将乙烯碳酸盐 (EC) 替换为结合较弱的基溶剂 (isoBN).
- 在快速充电条件下 (4°C在25°C) 制造和测试LiNi0.8Co0.1Mn0.1O2/石墨全电池.
主要成果:
- 溶解结构的修改促进了较小的SEI粒的演化,为Li+离子运输创造了高效的途径.
- 使用含有isoBN的电解质会导致较低的阻力SEI和较低的粘度,从而促进更快的Li+离子交叉.
- 实现了全电池的快速充电,在4C速率下降了涂层.
结论:
- 定制电解质溶解结构是设计SEI形态的关键,以增强Li+离子运输.
- 接口工程,特别是控制SEI颗粒大小和电解质特性,显著改善了LIBs的快速充电性能和循环稳定性.
- 这些发现支持开发LIBs,用于要求快速充电能力的交通应用.
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