基于酸盐的低成本NaNO3电解质,具有对可持续和高安全离子电池的特殊稳定性
Kean Chen1, Hui Chen1, Yanan Zhao1
1College of Chemistry and Molecular Sciences, Hubei Key Laboratory of Electrochemical Power Sources, Wuhan University, Wuhan, 430072, China.
Angewandte Chemie (International ed. in English)
|December 2, 2025
概括
这项研究引入了一种新的离子电池电解质,在双溶剂系统中使用酸盐. 这种设计提高了稳定性和性能,为具有成本效益和可持续的储能解决方案铺平了道路.
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
- 可持续能源 可持续能源
背景情况:
- 传统的盐 (例如NaPF6,NaFSI) 用于离子电池 (SIB) 在合成,稳定性和成本方面存在挑战.
- 无机酸盐 (NaNO3) 是一种低成本,空气稳定的替代品,但具有较差的溶解性和还原稳定性.
研究的目的:
- 为SIBs开发一种具有成本效益和高安全性的电解质,使用NaNO3作为唯一的盐.
- 为了克服NaNO3在非水性电解质中的可溶性和稳定性限制.
- 为了提高硬碳阳极和Na4Fe3(PO4)2(P2O7) 阴极在SIB中的性能.
主要方法:
- 使用三甲基酸盐 (TMP) 和三-2,2,2-三乙烯酸盐 (TFEP) 与NaNO3.3一起制备一种新型的双溶剂电解质.
- 硬碳 (HC) 阳极和Na4Fe3 ((PO4) 2 ((P2O7) (NFPP) 阴极的电化学表征.
- 在HC阳极上形成的固体电解质介相 (SEI) 薄膜的分析.
- 组装和测试HC//NFPP袋式电池.
主要成果:
- 该TMP/TFEP双溶剂系统使NaNO3具有高溶解度,并增强了降解稳定性.
- 在HC阳极上形成了富含NaF/NaNxOy的分层无机SEI膜,提高了循环稳定性 (200个循环后99.4%的保留率) 和初始库伦比效率 (78.6%).
- 在400个循环后,NFPP阴极保持了87.5%的容量.
- 囊细胞在点火条件下显示出可行性.
结论:
- 拟议的NaNO3基电解质为低成本,高安全的SIB提供了一个有前途的战略.
- 双溶剂系统有效地解决了NaNO3的限制,从而实现了强大的电极性能.
- 这项研究为使用先进的SIB电解质的可持续能源存储解决方案提供了蓝图.
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