基于酸的局部高度电解质用于先进的金属电池
Menghao Li1,2, Yue Liu3, Xuming Yang4
1Eastern Institute for Advanced Study, Eastern Institute of Technology, Ningbo, Zhejiang, 315200, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|July 29, 2024
概括
使用新型稀释剂的基电解质使高压电池的稳定金属阳极成为可能. 这一突破解决了还原性的不稳定性,为更安全,更快速充电的储能铺平了道路.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 乙 (AN) 是用于高压电池的有前途的电解质溶剂,但具有还原性不稳定性,阻碍其与金属阳极 (LMA) 的使用.
- 开发稳定的LMA对于推进电池技术至关重要,能够实现更高的能量密度和更快的充电速度.
研究的目的:
- 开发一种稳定的基于AN的电解质系统,用于无树的金属阳极.
- 研究一种新型稀释剂在提高电解质性能和阳极稳定性方面的作用.
- 为了证明开发的电解质在高压全电池中的实际应用.
主要方法:
- 基于AN的局部高度电解质 (LHCE) 的配方,使用1,1,2,2-四乙烯-2,2,3,3-四乙烯 (TTE) 作为稀释剂.
- 电化学表征包括稳定性窗口,核聚变超电位和库伦比效率 (CE) 测量.
- 低温电子显微镜 (Cryo-EM) 和理论模拟分析溶解结构和固体电解质介相 (SEI) 形成.
主要成果:
- 基于AN的LHCE实现了接近6V的电化学稳定性窗口,优异的湿透性和阻燃性.
- 观察到最小的核过电 (24 mV) 和高平均半细胞CE (99.5%在0.5 mA cm-2).
- 形成了稳定和均的SEI层,防止阳极AN分解,并使得无树的沉积成为可能.
- 在使用LiFePO4 (LFP) 和LiNi0.8Co0.1Mn0.1O2 (NCM811) 阴极的全电池中显示出有希望的性能.
结论:
- 以TTE稀释的AN为基础的LHCE有效地稳定了金属阳极,克服了AN固有的还原不稳定性.
- 调节溶解结构和SEI特性是实现密集,无树和稳定的LMA的关键.
- 这项工作提出了利用基于AN的电解质在高性能金属电池中的可行策略.
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