在局部缩的离子液体电解质中,用于高稳定金属电池的耐降解化以太基稀释剂
Zheng Liu1,2, Haifeng Tu1,2, Zhicheng Wang3,4
1School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei, Anhui, 230026, China.
Small (Weinheim an der Bergstrasse, Germany)
|May 3, 2025
概括
局部缩的离子液电解质与稳定的2,2-二二甲基乙醇稀释剂显著提高金属电池的性能. 这种新型的电解质增强了硬币和袋式电池的循环稳定性和coulombic效率.
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:
- 局部缩的离子液体电解质 (LCILEs) 是金属电池 (LMB) 的关键.
- 强的离子衍生的固体电解质介相 (SEI) 和富含Ni的阴极兼容性是LCILE的优势.
- 基于的稀释剂提供低成本和弱的Li + 协调,但它们的抗减少稳定性至关重要.
研究的目的:
- 为了研究基稀释剂结构对LCILE中的阳极稳定性的影响.
- 为了评估2,2-二二甲基乙 (DCDEE) 作为一个稳定的稀释剂在LCILEs为LMBs.
- 为了评估LCILE与DCDEE在LidoseHydroCu和实用的囊细胞中的性能.
主要方法:
- 基于电友性和还原稳定性对二卜 (DCB14,DCP15) 和二二甲基 (DCDEE) 稀释剂的比较分析.
- 使用不同稀释剂的LCILEs对Li水晶细胞进行电化学测试.
- 制造和循环运行1.2 Ah的液晶电池LiNi0.9Co0.05Mn0.05O2 (NCM90) 袋式电池.
主要成果:
- DCB14和DCP15具有很高的电友性,导致与金属发生严重的副作用反应.
- 由于其富含电子的系统和低电友性,DCDEE显示出优异的还原稳定性.
- 带有DCDEE的LCILE促进Li+运输,并形成双化物LiF/LiCl接相,增强电极稳定性.
- 立体二氧化细胞实现了740个周期,具有99%的库伦比效率.
- 1.2Ah的NCM90袋式电池表现出令人印象深刻的循环稳定性,具有99.8%的库伦比效率.
结论:
- 稀释剂的抗减少能力对于LCILE中的阳极稳定性至关重要.
- DCDEE是LCILE的优质稀释剂,可以实现高性能和稳定的LMBs.
- 开发的LCILE系统在高能量密度电池的实际应用方面显示出显著的前景.
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