增强的-有机酸电解质使流动的离子导体固体电解质介相能够用于高性能金属电池
Xinmei Song1, Jingjie Sun1, Wen Ren2
1State Key Laboratory of Coordination Chemistry, MOE Key Laboratory of Mesoscopic Chemistry, MOE Key Laboratory of High Performance Polymer Materials and Technology, Jiangsu Key Laboratory of Advanced Organic Materials, Tianchang New Materials and Energy Technology Research Center, Research Institute of Green Chemistry and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu, 210023, China.
Angewandte Chemie (International ed. in English)
|November 11, 2024
概括
研究人员使用基盐和开发了一种用于可充电电池的新电解质. 这种先进的电解质可实现稳定的涂层和剥离,改善电池性能和寿命,以实现可持续的能源存储.
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:
- 可充电电池为储能提供了一个可持续的,低成本的替代方案.
- 基有机盐显示出有前途,但在合成和Mg阳极被动化方面面临挑战.
- 现有的电解质往往由于电化学稳定性不佳和阳极表面问题而受到影响.
研究的目的:
- 为可充电电池设计一种先进的电解质配方.
- 为了克服当前基电解质的局限性,特别是Mg阳极被动化.
- 为了提高离子电池的电化学性能和循环稳定性.
主要方法:
- 开发了一种新型的电解质系统:Mg[B(HFIP) [4]2/DME-MgI2,通过结合trifluoroisopropyl) 酸盐 (B(HFIP) 3), (I2) 和1,2-dimethoxyethane (DME).
- 在Mg阳极上研究了固体电解质相间层 (SEI) 在现场的形成.
- 使用Mg金属阳极和Chevrel相Mo6S8阴极,评估了电化学性能,包括超电位,库伦比效率和循环稳定性.
主要成果:
- 新的Mg[B(HFIP) [4]2/DME-MgI2电解质促进了保护性SEI层 (MgF2和MgI2) 在现场形成,从而实现了稳定的Mg/脱落.
- 证明了优越的电化学性能:超低的超电位 (~80 mV),高的库伦比效率,并延长了超过1500小时的循环.
- 使用这种电解质和Mo6S8阴极的可充电电池在1200个周期内实现了稳定的循环.
结论:
- 使用开发的素增强策略对基Mg离子电解质有效.
- 在现场形成的SEI层对于增强Mg阳极的稳定性和动力学至关重要.
- 这项工作在多价值二次电池技术中取得了重大进步,为优化固体电解质界面铺平了道路.
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