了解在使用 LiDFOB 盐的无阳极金属电池循环测试期间的 SEI 演变
Naufal Hanif Hawari1,2, Huiqing Xie1, Achmad Prayogi2
1Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology, and Research) 138634 Singapore dingni@imre.a-star.edu.sg.
RSC advances
|August 31, 2023
概括
二氧化玻酸盐 (LiDFOB) 电解质在没有阳极的金属电池中产生一种富含无机物的固体电解质介相 (SEI). 这种稳定的SEI提高了涂/剥离的可逆性,并提高了电池循环性能.
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:
- 没有阳极的金属电池 (AFLMB) 承诺更高的能量密度,但遭受了树突性增长和不稳定的固体电解质介相 (SEI) 形成.
- 电解质与二 (oxalato) 酸盐 (LiDFOB) 在AFLMB中表现出比六酸盐 (LiPF6) 更好的性能,但潜在的机制需要阐明.
研究的目的:
- 研究使用LiDFOB与LiPF电解质的AFLMBs中的SEI形成和演变.
- 了解SEI成分如何影响AFLMBs的电化学性能和稳定性.
主要方法:
- X射线光电子光谱 (XPS) 深度分析分析SEI组成.
- 电化学阻抗光谱 (EIS) 用于评估接口电阻.
- 在Cu‖NMC全电池中进行循环测试,以评估电池性能.
主要成果:
- 与LiPF6 (1.42) 相比,基于LiDFOB的电解质形成了一个具有低C/O比率 (0.56) 的有机丰富的SEI.
- 富含无机物质的SEI促进了密集的涂层,并提高了涂层/剥离的可逆性,达到高平均库伦比效率 (CE) ~98%.
- 电化学阻抗光谱表明,SEI和阴极电解质相间电阻在稳定AFLMB循环中起着至关重要的作用.
结论:
- 由LiDFOB形成的富含无机物SEI是通过改善金属循环和降低界面电阻来稳定AFLMB的关键.
- LiDFOB为开发高性能和稳定的无阳极金属电池提供了一个有前途的战略.
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