局部缩的离子液体电解质用于宽温度范围的硫电池
Cheng Xu1,2, Thomas Diemant1,2, Alessandro Mariani3
1Helmholtz Institute Ulm (HIU) Electrochemical Energy Storage, Helmholtzstraße 11, D-89081, Ulm, Germany.
Angewandte Chemie (International ed. in English)
|January 20, 2024
概括
研究人员为硫 (Al-S) 电池开发了新的电解质,在广泛的温度范围内提高了性能. 这些局部缩的离子液体电解质 (LCILEs) 增强了流动性和离子传输,提高了电池容量和寿命.
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:
- 硫 (Al-S) 电池具有较高的理论容量,低成本和安全优势.
- 在Al-S电池中的常规离子液体电解质 (ILEs) 具有高粘度和较差的离子传输,限制性能,特别是在低温下.
- 解决这些局限性对于实现Al-S电池技术的潜力至关重要.
研究的目的:
- 开发具有更好的动力学和性能的广泛温度范围的Al-S电池.
- 调查局部缩的离子液体电解质 (LCILEs) 的使用,以提高Al-S电池的运行.
- 评估非溶解辅溶剂对电解质特性和电池性能的影响.
主要方法:
- 通过用1,2-二二 (dFBn) 稀释ILEs,制备局部缩的离子液体电解质 (LCILEs).
- 电解质属性的表征,包括流动性和离子导电性.
- 电化学测试Al-S细胞的LCILEs和整洁的ILEs在温度范围为-20至40°C.
主要成果:
- 将dFBn添加到ILEs中有效地增强了流动性和离子导电性,而不会破坏AlCl4-/Al2Cl7-平衡.
- 与具有整洁ILEs的细胞相比,具有LCILEs的Al-S细胞表现出优异的特异性,增强的循环性和减少的极化.
- 带有LCILE的Al-S电池在20°C的300个循环后保持了507 mAh g-1的容量,明显超过了使用dFBn无电解质实现的229 mAh g-1.
结论:
- 局部缩的离子液体电解质 (LCILEs) 是开发高性能,宽温度范围的Al-S电池的可行策略.
- 拟议的LCILE系统克服了传统电解质的动力限制,实现了高效的剥离/板和提高了电池的整体性能.
- 这项研究突出了LCILE在推动硫电池技术实际应用方面的潜力.
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