反应中心转移部分化电解质用于坚固的金属电池
Tong Yang1, Wenna Zhang2, Chunli Shen1
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China.
ChemSusChem
|May 19, 2024
概括
一种新的部分化电解质通过促进稳定,富含LiF的固体电解质间相,提高了金属电池的寿命. 这种设计可以提高高能量密度应用的循环稳定性和效率.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 金属电池 (LMB) 对于高能量密度存储至关重要.
- 电解质配方是延长LMB寿命和性能的关键.
- 实现稳定的固体电解质相间层 (SEI) 是一个重大挑战.
研究的目的:
- 开发一种兼容的电解质,以提高金属电池的寿命.
- 研究电解质溶解结构在SEI形成中的作用.
- 为了评估新型部分化电解质的电化学性能.
主要方法:
- 部分化电解质的配方,具有较低的Li+溶解亲和力.
- 电化学表征包括Li核化超电位和循环测试在Li光和Li光NCM811细胞中.
- 对SEI组成的分析,重点关注LiF丰富.
主要成果:
- 电解质促进离子驱动的SEI形成,从而形成富含LiF的层.
- 证明了有效的Li+运输动力学和降低Li核化过电位 (28mV).
- 在长时间循环运行时,在LiteCNCM811电池中实现了高容量保留 (89.30%在0.4C,81.90%在1C) 和库伦比效率 (99.80%在0.4C,99.40%在1C).
结论:
- 部分化电解质中的弱溶解相互作用对LMB稳定性具有重要意义.
- 电解质溶剂结构极大地影响稳定的SEI层的形成.
- 开发的电解质使金属电池具有长期稳定性和高能量密度.
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