在高度缩的离子液体电解质中增强LiNiO2的循环稳定性
Huazhen Liu1, Hiroki Maeda1, Jinkwang Hwang1
1Graduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan.
ACS applied materials & interfaces
|September 28, 2024
概括
具有二硫胺盐的离子液体通过抑制溶解和副作用来改善氧化电池的性能. 这种无LiPF6的电解质增强了下一代汽车电池的循环稳定性.
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
- 电池技术 电池技术
背景情况:
- 氧化 (LiNiO2) 是用于先进电池的高性价比的阴极材料,但由于溶解,其周期寿命较低.
- 来自LiPF6电解质的化 (HF) 与LiNiO2发生反应,导致性能降低.
研究的目的:
- 研究没有LiPF6的离子液体电解质,以提高LiNiO2阴极稳定性.
- 了解电解质成分在减轻寄生反应和提高电池性能方面的作用.
主要方法:
- 用Li[FSA]盐作为Li/LiNiO2细胞的电解质合成和测试了离子液体.
- 进行了电化学循环测试,以评估容量保留和循环寿命.
- 进行了材料表征,以分析阴极电解质介相 (CEI) 和电极稳定性.
主要成果:
- 离子液体电解质显著提高了循环性能,在500个循环后实现了73.1%的容量保留.
- 在LiNiO2电极上形成了一个稳定的CEI,抑制了Ni的溶解和结构降解.
- 电解质有效地减轻了在高电位时的电流收集器腐蚀.
结论:
- 没有LiPF6的离子液体,特别是含有Li[FSA]盐的离子液体,为稳定的LiNiO2阴极提供了有希望的替代品.
- 优化电解质成分对于解决高能量密度电池的稳定性问题至关重要.
- 这项研究有助于开发更安全,更耐用的下一代电动汽车电池.
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