MgF2 接口工程 促进LiF丰富的固体电解质接口在Si-C上的增长和稳定性
Peng Liu1,2, Yupeng Xiao1,2, Jiyuan You1,2
1School of Energy and Power Engineering Nanjing University of Science and Technology, Nanjing 210094, P. R. China.
ACS applied materials & interfaces
|October 21, 2024
概括
一种新的MgF2-修改分离器 (MF-PP) 创建了一个强大的,富含的固体电解质接口 (SEI) 层. 这稳定了碳阳极,显著改善了电池周期寿命和能量密度.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- -碳 (Si-C) 阳极由于循环过程中连续固体电解质接口 (SEI) 层断裂和重构而遭受快速容量衰减.
- -C阳极的体积扩大加剧了SEI的不稳定性,限制了它们在高能量密度电池中的应用.
研究的目的:
- 通过修改电池分离器,为Si-C阳极开发稳定的SEI层.
- 提高基于Si的电池的电化学性能和循环寿命.
主要方法:
- 化 (MgF2) 改性聚烯 (MF-PP) 分离器的设计和制造.
- 在Si-C阳极上构建富含的SEI层,主要由化 (LiF) 组成.
- 电化学测试Si-C干的MF-PP半电池和LFP干的MF-PP干的Si-C全电池.
主要成果:
- MF-PP分离器促进了强大的富含的SEI层的形成,有效地减轻了Si-C电极中的体积膨胀应力.
- 在450个循环后,Si-C bersaysaysayMF-PP半电池保持了543.2 mAh g-1的高可逆容量.
- 在100个循环后,LFP掌管器MF-PP掌管器Si-C全电池表现出103.4 mAh g-1的可逆容量,高库伦比效率.
结论:
- 简单且低成本的MF-PP分离器修改策略成功提高了Si基阳极的稳定性和周期寿命.
- 这种方法为开发下一代高能量密度电池系统使用基于Si的阳极提供了可扩展的解决方案.
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