在极端操作条件下,尽量减少金属电池以太电解质中的溶剂协调
Haipeng Zhu1, Qiangfeng Zhang1, Kefei Wang2
1State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|June 23, 2025
概括
这项研究通过用DENE和HFAA添加剂修改以太电解质来增强金属电池 (LMB). 这些修改提高了在极端条件下高压稳定性和性能,使先进的电池应用成为可能.
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
- 电池技术 电池技术
背景情况:
- 基于以太的电解质对金属电池 (LMB) 是有前途的,但氧化稳定性低 (<4.5V).
- 这种不稳定性限制了它们在高性能储能系统中的实际应用.
- 开发稳定的电解质对于推进LMB技术至关重要.
研究的目的:
- 使用以太基电解质来提高LMB的高压性能和稳定性.
- 通过使用新型添加剂来克服传统以太溶剂的局限性.
- 为了证明在极端运行条件下LMB的可行性.
主要方法:
- 使用乙烯,乙烯和高化添加剂修改以太电解质.
- 研究乙烯基醇二 ((propionitrile) 以太 (DENE) 增强的氧化稳定性.
- 使用六黄油无水化物 (HFAA) 形成保护性固体电解质介相 (SEI).
- 协同使用DENE和HFAA以最大限度地减少溶剂协调并促进Li+溶解.
主要成果:
- 通过抑制以太氧上的单对电子损失,DENE将电化学窗口增加到≥5V.
- HFAA促进了富含LiF的SEI的形成,确保了统一的Li+沉积/剥离和高可逆性.
- 经过修改的电解质使NCM811阴极能够在超高电压 (4.7V),超高速率 (20°C) 和超宽温度范围 (-30~120°C) 中稳定运行.
- 在一个30Ah高容量的金属袋细胞和一个502.7Wh kg-1高能量密度的金属袋细胞中实现了稳定的运行.
结论:
- DENE和HFAA的协同作用组合显著提高了LMB以基电解质的电化学稳定性和性能.
- 这些改性电解质使LiNi0.8Co0.1Mn0.1O2 (NCM811) 阴极在极端条件下能够稳定运行.
- 开发的系统对下一代高能量密度和高功率金属电池具有很大的前景.
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