高能金属电池的组合测序接口层
Jeong-A Lee1, Saehun Kim1, Yoonhan Cho2
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 science (Weinheim, Baden-Wurttemberg, Germany)
|February 26, 2024
概括
电解质添加剂为金属电池 (LMB) 创建一个层次的固体电解质介相 (SEI). 这种工程 SEI 改善了沉积和循环稳定性,提高了 LMB 的性能.
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:
- 金属电池 (LMB) 提供高能量密度,但由于阳极接口的问题,其循环稳定性不佳.
- 开发稳定的固体电解质间相 (SEI) 对于提高金属阳极的可逆性和寿命至关重要.
- 电解质添加剂是设计强大的SEI层的关键,可以管理沉积和电解质降解.
研究的目的:
- 调查多功能电解质添加剂在设计LMBs等级性SEI中的作用.
- 了解设计的SEI结构如何影响Li+运输,Li沉积和电解质稳定性.
- 通过优化的SEI层来证明LMB的增强循环性能.
主要方法:
- 使用电解质添加剂和化溶剂制造多层SEI结构.
- 深入分析SEI的组成和形态,包括富含LiF,P-O和聚合物物种.
- 电化学测试Li的液体体LiNi0.8Co0.1Mn0.1O2全电池,以评估循环稳定性和性能.
主要成果:
- 成功形成了一个由LiF丰富,P-O和弹性聚合物物种组成的工程层次SEI.
- 多层的SEI促进了均的Li+供应,非局部化的Li沉积,并减少了电解质降解.
- 外部聚合物SEI层有效地适应了阳极体积波动,显著提高了循环稳定性.
结论:
- 电解质添加剂和化溶剂可以为LMBs设计先进的接口层.
- 开发的层次式SEI促进了Li-metal阳极的稳定循环和高性能.
- 这项工作通过电解质配方工程为高性能LMB开发开辟了新的途径.
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