高混沌诱导的多重丰富溶解结构使超高压和宽温度金属电池成为可能
Fangyuan Cheng1, Wen Zhang1, Qing Li1
1State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.
ACS nano
|November 27, 2023
概括
一种新的高混沌电解质通过稳定电极接口在广泛的温度下使超高能量密度的金属电池成为可能. 这一策略通过管理金属电池反应和树突成长来提高性能.
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:
- 超高能量密度的金属电池需要在高电压 (≥4.7V) 和广泛的温度下稳定的电解质.
- 电极-电解质反应在高温下降低性能,而在低温下形成树突.
- 现有的电解质很难同时满足这些苛刻的,往往相互矛盾的要求.
研究的目的:
- 开发一种电解质,使金属电池能够在高电压和广泛的温度范围内稳定运行.
- 为了应对侵略性界面反应和树形成的挑战.
- 为优化电池性能提出一个高混乱电解质设计策略.
主要方法:
- 提出了一种高混沌电解质设计策略,以促进具有多个离子的弱溶解结构.
- 量身定制了一个Li+-EMC-DMC-DFOB--PO2F2--PF6-多离子溶解罩.
- 研究了对电极-电解质间相 (EEI) 形成一个强大的有机丰富的间相.
主要成果:
- 获得了强大的有机丰富的EEI,可以抵抗4.7V和45°C的界面反应.
- 通过多离子结构减弱的Li+溶解改善了在-30°C的溶解动力学.
- 成功抑制了树的生长,增强了电荷转移动力学.
结论:
- 高混沌电解质设计策略有效地稳定了高压金属电池的电极-电解质接口.
- 这种方法可以同时优化溶解化学,以实现广泛的温度性能.
- 为开发先进的电解质提供了一条创新的途径,用于苛刻的储能应用.
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