固体电解质相间结构由功能电解质添加剂调节,以提高Li金属阳极性能
Hui Chen1, Yu-Xiang Xie1, Shi-Shi Liu1
1College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
ACS applied materials & interfaces
|September 21, 2023
概括
一种新的功能性电解质添加剂,PANHF,有效地防止高能量密度电池中的树的生长. 这种双聚合物添加剂增强了下一代金属电池的循环稳定性和容量保留.
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
- 聚合物化学 聚合物化学
背景情况:
- (Li) 金属阳极对于高能量密度电池至关重要,但受到树状物生长和不稳定的固体电解质介相层 (SEI) 的影响.
- 这些问题限制了金属电池的安全性和循环寿命,阻碍了它们的商业化.
研究的目的:
- 合成和评估一种新的功能性电解质添加剂,PANHF,以提高Li金属阳极性能.
- 研究PANHF增强金属阳极及其固体电解质介相稳定的机制.
主要方法:
- 通过聚合烯和六布基甲酸盐合成PANHF.
- 用含有PANHF的电解质对Li/Li细胞和Li/NCM811细胞进行电化学表征.
- 在PANHF的存在下形成的固体电解质介相的分析特征.
主要成果:
- PANHF显著提高了沉积/溶解的可逆性和库伦比效率.
- 通过形成双层SEI (有机外层,LiF内层),PANHF有效地抑制了Li树突的生长.
- 使用0.5%重量的PANHF的Li/Li细胞在1.0mA cm-2下完成了700个循环,Li/NCM811细胞在200个循环后保持了83.41%的容量.
结论:
- PANHF是一种高效的功能电解质添加剂,用于稳定金属阳极.
- 双聚合物添加剂战略为开发下一代高性能和安全的金属电池提供了一个有前途的途径.
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