含的混合SEI层可实现高质量负载和没有阳极的金属电池
Li Xia1, Liang Lin1, Jiantao Li2
1State Key Laboratory of Physical Chemistry of Solid Surface, College of Materials, Xiamen University, Xiamen, 361005, China.
Angewandte Chemie (International ed. in English)
|March 16, 2025
概括
一种新的混合固体电解质介相 (SEI) 层稳定了高能电池中的金属阳极. 这项创新可以防止树石的形成,从而使金属电池的周期寿命更长,性能更好.
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:
- 不稳定的固体电解质间相 (SEI) 层阻碍金属电池的性能,阻断离子扩散并导致树突的生长.
- 这限制了高能量密度金属电池的实际应用.
研究的目的:
- 在金属阳极上设计一个稳定的混合SEI层,其中包含物种.
- 为了提高/电解质接口的稳定性和离子传输特性.
主要方法:
- 在金属上构建一个混合SEI层,其中包含含有无机成分 (Li3N,LiF,Li2CO3).
- 用Na3V2(PO4) 3阴极对对称细胞和全细胞进行电化学测试.
主要成果:
- 混合SEI层有效地稳定了金属阳极,减少了副作用和气体生成.
- 对称细胞表现出较低的超电位和延长周期寿命 (5900小时在3mA cm-2).
- 完整电池表现出高的特定容量和循环稳定性,即使在高阴极负荷和低N/P比.
结论:
- 含物种的混合SEI层是实现稳定和高性能金属电池的有希望的策略.
- 这种方法解决了金属阳极稳定性和离子流量调节方面的关键挑战.
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