在局部缩的离子液电解质中调节非平衡溶解结构,用于广泛温度和高压金属电池
Haifeng Tu1,2, Zhicheng Wang3,4, Jiangyan Xue1,2
1School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei, Anhui, 230026, China.
Angewandte Chemie (International ed. in English)
|October 4, 2024
概括
研究人员开发了一种新的电解质,用于高压金属电池,使用1,3-dichloropropane. 这提高了离子传输和稳定性,使高容量保留和广泛的温度操作成为先进的能量存储.
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:
- 高压金属电池 (LMB) 面临着来自电极化学的挑战.
- 局部缩的离子液体电解质 (LCILEs) 显示出与阳极和高压阴极稳定的承诺.
- 在LCILE中稀释剂对溶解结构和Li+离子运输的作用尚不清楚.
研究的目的:
- 研究LCILE中的稀释剂对热力学稳定性和离子传输的影响.
- 开发使用1,3-二公 (DCP13) 的宽温度LCILE,以提高LMB的性能.
- 为了改善+离子运输和抑制高阴极的副作用.
主要方法:
- 提出了一个带有1,3-二公 (DCP13) 稀释剂的宽温度LCILE.
- 在外部电场下构建了一个非平衡的溶解结构.
- 研究了DCP13在+离子溶解膜中的行为.
主要成果:
- DCP13增强了Li+离子运输,并抑制了LiNi0.9Co0.05Mn0.05O2 (NCM90) 阴极中的氧化副作用.
- 一个使用已开发的LCILE的Li/NCM90电池在4.3V的240个循环后实现了94%的容量保留.
- 电解质在高切断电压 (4.4-4.6V) 和广泛的温度范围 (-20°C至60°C) 中表现出稳定的运行.
- 一个Ah级袋式电池表现出高能量密度和稳定的循环,证明了其实际可行性.
结论:
- 该研究重新定义了稀释剂在LCILE中的作用,强调了它们在溶解结构修改中的重要性.
- 开发的基于DCP13的LCILE为高能量密度和稳定的金属电池提供了有前途的解决方案.
- 这项工作为设计下一代电池的先进电解质提供了宝贵的见解.
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