富含LiF的电极-电解质接口通过双功能电解质添加剂实现高性能Li/LiNi0.8Co0.1Mn0.1O2电池
Yue Lei1, Xin Xu1, Junying Yin2
1College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, P. R. China.
ACS applied materials & interfaces
|October 2, 2023
概括
这项研究引入了1,1,1,3,3,3-hexafluoroisopropyl methacrylate (HFM) 作为金属电池的电解质添加剂. 通过防止树的生长和分解,HFM创造了保护性界面,提高了电池的性能和稳定性.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 商业离子电池面临着基于LiPF6的电解质的挑战,包括树的生长和电解质分解.
- 金属电池 (LMB) 需要电解质,可以承受激烈的化学和电化学条件.
研究的目的:
- 为了解决LMBs当前电解质的局限性.
- 引入一种新的多功能电解质添加剂,即1,1,1,3,3,3-hexafluoroisopropyl methacrylate (HFM),以提高电池性能.
主要方法:
- HFM被用作金属电池中的电解质添加剂.
- 保护性固体/阴极-电解质介面 (SEI/CEI) 在金属阳极 (LMA) 和富含Ni的阴极表面上构建.
- 评估了带有和没有HFM的Li/LiNi0.8Co0.1Mn0.1O2电池和Li/Li对称电池的电化学性能.
主要成果:
- HFM促进了富含LiF的SEI/CEI膜的形成,增强了电子绝缘和机械强度.
- 由HFM衍生的接相抑制了寄生反应,促进了均的沉积,并减轻了阴极中的微裂变演变.
- 与对照细胞相比,具有HFM的细胞表现出更好的容量保留 (74.7% vs 52.8%在1C的200个周期后) 和更好的速率性能.
- 具有HFM的Li/Li对称电池证明了超过500小时的稳定循环.
结论:
- HFM是一种有前途的多功能添加剂,用于稳定LMB中的金属阳极和丰富的阴极.
- 通过HFM形成富含LiF的界面是提高电池稳定性,循环寿命和速率能力的关键.
- HFM为开发高性能LMB提供了一种简单且具有成本效益的策略.
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