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双有机溶剂离子电解质使高稳定性金属电池成为可能
Ruiqi He1, Fangfang Yu2, Kuan Wu1,3
1School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.
Nano letters
|June 27, 2023
概括
在二甲基碳酸盐和乙烯基碳酸盐溶剂中使用盐的新型含水有机电解质提高了水性电池的性能. 这促进了统一的和剥离,使700多个稳定的循环.
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:
- 水性电池为离子电池提供了更安全,更便宜的替代方案.
- 挑战包括低阳极可逆性,树增长和水耗.
- 开发稳定的电解质对于实际应用至关重要.
研究的目的:
- 为水性阳极开发一种新的含水有机电解质.
- 为了解决涂/剥离可逆性和树突形成的问题.
- 为了提高水性电池的整体稳定性和性能.
主要方法:
- 一种双有机溶剂电解质的配方:在二甲基碳酸盐 (DMC) 和乙烯基碳酸盐 (EC) 中化 Zn(BF4) 2.
- 研究电解质对涂/脱落行为的影响.
- 阳极和全电池 (使用V2O5阴极) 的电化学测试.
主要成果:
- 电解液Zn(BF4)2/DMC/EC抑制了副作用,并促进了的均沉积/脱落.
- 形成了一个稳定的固态接口层和特定的Zn2+溶剂复合体.
- 阳极在1 mA cm-2下实现了超过700个稳定的循环,库伦比效率为99.71%.
- 一个完整的细胞在1Ag-1时表现出1600个周期的稳定循环,没有容量衰减.
结论:
- 开发的含水有机电解质显著提高了水性阳极的稳定性和可循环性.
- 这种电解质系统为高性能水性电池的实际应用提供了一个有希望的途径.
- 这些发现有助于推进更安全,更可持续的储能解决方案.
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