在离子电池中使用以乙烯碳酸为基础的局部高度电解质形成固体电解质相间膜的机制
Jiaqi Ding1, Longkai Zhang1, Xinyu Li1
1School of Chemistry, South China Normal University, Guangzhou 510006, People's Republic of China.
Journal of colloid and interface science
|January 21, 2025
概括
研究人员开发了一种用于离子电池 (SIB) 的新型电解质,使用了1,1,2,2-四甲基-2,2,3,3-四烯乙烯 (HFE). 这种局部高度电解质 (LHCE) 增强了电池的稳定性和循环性能,解决了SIB中的容量衰减挑战.
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:
- 离子电池 (SIB) 为大规模储能提供了一个低成本,丰富的替代方案.
- 在循环期间产能减弱仍然是阻碍SIB商业化的一个重大挑战.
- 电解质设计对于提高SIB稳定性和周期寿命至关重要.
研究的目的:
- 为离子电池设计局部高度电解质 (LHCE).
- 为了稳定固体电解质间相 (SEI) 并减轻容量衰减.
- 为了提高SIBs的电化学性能.
主要方法:
- 将1,1,2,2-四乙烯-2,2,3,3-四烯乙烯 (HFE) 引入到NaPF6/EC电解质中.
- 电解质溶解结构的调制以形成富含NaF的SEI.
- 使用NFPO阴极和NFMO干部干部HC袋式电池对SIB进行电化学测试.
主要成果:
- LHCE有效地稳定了电极表面上的SEI层.
- 形成了一个富含NaF的SEI,改善了接口稳定性.
- 基于NFPO阴极的SIB在0.5C的300个循环后显示91.5%的容量保留.
- 在1°C的500个循环后,NFMO水晶体液囊电池实现了84.2%的容量保留.
结论:
- 开发的LHCE显著提高了离子电池的循环稳定性.
- 调节电解质溶解结构是SEI稳定的一个有效策略.
- 这项工作为设计下一代SIB的先进电解质提供了新的见解.
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