构建稳定的固体电解质接口,并通过金属电池的电解质添加剂促进的运输
Meng Li1, Zeren Zhou1, Qixian Zhang2
1School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China. fanlsh@hit.edu.cn.
N-methyl-N-(trimethylsilyl) trifluoroacetamide (MSTFA) 通过形成稳定的固体电解质间相 (SEI) 和阴极电解质间相 (CEI) 来提高电池性能. 这种添加剂使Li‖Li细胞能够稳定循环,并保持LiFePO4‖Li细胞的高容量.
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
- 电池技术 电池技术
背景情况:
- 稳定的固体电解质介相 (SEI) 和阴极电解质介相 (CEI) 层的开发对于先进的电池性能至关重要.
- 电解质添加剂在修改相间形成和改善电池寿命方面发挥着关键作用.
研究的目的:
- 调查N-甲基-N-(三甲基) 三乙胺 (MSTFA) 作为离子电池的新型电解质添加剂的有效性.
- 评估MSTFA对金属和铁酸盐 (LiFePO4) 电池电池的稳定性和性能的影响.
主要方法:
- 用含有MSTFA的电解质对Li‖Li和LiFePO4‖Li细胞进行电化学测试.
- 分析SEI/CEI层的形成和稳定性.
主要成果:
- 观察到MSTFA融入了解决结构,促进了稳定的SEI/CEI的形成.
- 细胞在含有MSTFA的电解质的400个周期内表现出稳定的循环.
- LiFePO4‖Li细胞在5C的高速率下经过500个循环后,表现出93.6%的出色容量保留.
结论:
- MSTFA是一种有前途的电解质添加剂,可提高电池的循环寿命和稳定性.
- 通过MSTFA形成一个强大的SEI/CEI层,大大提高了电池的性能.
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