通过在Li-O电池中的牺牲性聚合物添加剂在O2大气中保护Li-金属
Xiaohong Wu1, Ben Niu2, Yonglin Tang3
1Fujian Provincial Key Laboratory of Functional Materials and Applications, Institute of Advanced Energy Materials, School of Materials Science and Engineering, Xiamen University of Technology, Xiamen, 361024, P. R. China. xiaohongwu@xmut.edu.cn.
Nanoscale
|November 1, 2023
概括
一种新的聚合物添加剂可以保护氧电池中的金属阳极. 这增强了固体电解质相间膜 (SEI),防止了降解,并在恶劣的氧气环境中改善了电池循环性能.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 氧电池 (LOB) 提供高的理论能量密度,但面临Li-金属阳极降解的挑战.
- 在氧气大气中的金属阳极上,固体电解质间相 (SEI) 形成不佳,导致穿效应和腐蚀.
研究的目的:
- 制定一项战略,以保护LOB中的金属阳极.
- 在恶劣的氧气条件下改善LOB的循环稳定性和性能.
主要方法:
- 引入聚烯胺-共聚甲基烯酸盐 (PAMMA) 共聚合物作为以太基电解质中的牺牲添加剂.
- 分析SEI薄膜的形成及其对金属保护和穿效应抑制的影响.
主要成果:
- PAMMA优先分解,在金属阳极上形成密集的,富含Li3N的SEI膜.
- 增强的SEI膜有效地抑制有害物种 (O2,超氧化物,质子,可溶性产品) 的穿效应.
- 玛添加剂导致保护良好的金属,并在LOB中显著改善循环性能.
结论:
- 像PAMMA这样的牺牲性聚合物添加剂为保护LOB中的金属阳极提供了一个有希望的策略.
- 这种方法提高了SEI质量,并减轻了严重氧气大气中的降解问题.
- 这些发现为高能量密度LOB的实际开发铺平了道路.
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