阳离子补充软溶解电解质稳定高压金属电池的双接口在广泛的温度下
Siyu Sun1,2, Huipeng Zeng2, Baichuan Cui2
1State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China.
ACS applied materials & interfaces
|September 18, 2025
概括
金属电池的新电解质使用双盐来稳定两个电极,防止树的生长并提高性能. 这一创新增长了电池的寿命,并使得在低温下稳定运行.
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
- 电池技术 电池技术
背景情况:
- 金属电池 (LMB) 患有界面不稳定性,包括树的生长和电解质分解.
- 由于相互竞争的反应,传统的电解质难以稳定金属阳极和高压阴极.
研究的目的:
- 开发一种新的电解质,以解决LMBs的界面挑战.
- 为了使金属阳极和高压阴极同时稳定.
主要方法:
- 使用1,3-二氧化 (1,3-DX) 和双盐 (LiFSI/LiPF6) 设计了一种软溶解电解质.
- 使用阳离子互补协调来分离FSI和PF6的接口功能.
- 使用光谱技术 (拉曼,170 NMR) 和显微镜 (SEM,TEM) 来进行表征.
主要成果:
- 电解质在阳极上形成了富含LiF的固体-电解质介面 (SEI),在NCM523阴极上形成了薄型阴极-电解质介面 (CEI).
- 在100个周期以4.3V的电压下,NCM523电池表现出超过80%的容量保留,并具有高库伦比效率 (>99.0%).
- 观察到优异的低温性能,在-30°C下保持36.9%的容量.
结论:
- 开发的电解质通过一个离子协同设计,有效地协调了批量离子运输与双电极接口要求.
- 这一策略提高了金属电池的稳定性,循环寿命和低温性能.
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