富含NaF的多功能层向稳定的全固态电池.
Tinghu Liu1,2, Lin Shen2, Yunming Li2
1School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, P. R. China.
ACS applied materials & interfaces
|September 15, 2023
概括
研究人员开发了一种NaF丰富的接口层,用于固态电池中的阳极. 这一层增强了电解质-电极接触,并抑制了树突,改善了电池的性能和循环寿命.
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:
- 纳西康氧化物固体电解质对所有固态电池具有高离子导电性和稳定性.
- 电解质-电极接触不良和树的生长阻碍了纳西康电解质的实际应用.
研究的目的:
- 开发用于阳极的多功能接口层,以提高基于NASICON的全固态电池的性能.
- 为了应对电池中接口接触和状物传播的挑战.
主要方法:
- 在使用聚四乙烯的阳极上在现场形成一个富含NaF的接口层.
- 介面层组成的表征 (NaF,无形碳,C-F键).
- 对Na3V2(PO4)3@C/Na@NaF丰富的全固态电池进行电化学测试.
主要成果:
- 富含NaF的接口层减少了扩散障碍和同质化的沉积.
- 抑制了树的生长,达到高临界电流密度4mA cm-2.2.
- 达到高初始特异性容量 (117.6mAhg-1在0.1°C) 和优异的容量保留 (>80%在0.5-1°C的750个循环后).
结论:
- 开发的富含NaF的接口层有效地改善了电池中的电解质-电极接口.
- 这种策略增强了沉积行为,并抑制了树岩的形成,从而提高了电池的性能.
- 这些发现为基于NASICON的全固态电池的实际应用铺平了道路.
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