活性稀释剂-离子协同作用策略 调节高效金属电池的不可燃电解质
Ran He1, Kuirong Deng1, Daize Mo1
1School of Applied Physics and Materials, Wuyi University, Jiangmen, 529020, P. R. China.
Angewandte Chemie (International ed. in English)
|January 3, 2024
概括
研究人员为高能金属电池 (LMB) 开发了一种新的电解质策略. 这种方法使用活性稀释剂和离子协同作用来创建稳定的接口,使下一代电池能够长期循环并提高性能.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 高能金属电池 (LMB) 对于下一代储能至关重要,因为它们的能量密度很高.
- 开发与金属阳极和高压阴极兼容的稳定,不可燃电解质仍然是一个重大挑战.
- 现有的电解质经常遭受退化和差的界面稳定性,限制电池性能和寿命.
研究的目的:
- 设计一种新的电解质系统,以提高LMB中金属阳极和高压阴极之间的界面兼容性.
- 为了研究活性稀释剂和特定离子在形成保护界面的协同作用.
- 为了使更安全,高性能和持久的高能金属电池的开发.
主要方法:
- 采用了一种活性稀释剂-离子协同策略,使用1,2-二二 (DFB) 作为基于二甲基 (DMAC) 的局部高度电解质 (LHCE-DFB) 中的活性稀释剂.
- 研究了DFB和bis ((fluorosulfonyl) imide (FSI-) 离子之间的相互作用,在阳极上形成富含LiF的固体电解质介面 (SEI),在阴极上形成阴极电解质介面 (CEI).
- 电化学性能通过使用LiRichardCu,LiRichardLi和NCM811RichardLi细胞来评估库伦比效率,循环稳定性和速率能力来评估.
主要成果:
- 该LHCE-DFB电解质与Li金属阳极和LiNi0.8Co0.1Mn0.1O2 (NCM811) 阴极的兼容性非常好.
- 形成了一个强大的富含LiF的SEI和CEI,有效地稳定了DMAC电解质并增强了接口稳定性.
- 金属阳极表现出超高的库伦比效率 (98.7%),无树涂层和稳定的长期循环.
- 制造出来的NCM811红色白色Li电池显示显著改善了长期循环稳定性和出色的速率能力.
结论:
- 活性稀释剂-离子协同作用策略为设计高电压,高能LMB的不可燃电解质提供了一个有前途的方法.
- 开发的LHCE-DFB电解质有效抑制副作用,增强界面稳定性,为LMB的实际应用铺平了道路.
- 这项工作为开发先进的电解质提供了新的途径,以满足下一代储能系统的需求.
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