稳定离子电池在恶劣环境中通过多功能添加剂战略稳定离子电池
Qian Wang1, Xinming Fan2,3,4, Qingyuan Yang2,3
1School of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, China.
Small (Weinheim an der Bergstrasse, Germany)
|November 11, 2025
概括
一种新的电解质添加剂Ethoxy ((pentafluoro) cyclotriphosphazene (PFPN) 在高温下稳定离子电池 (SIB). PFPN提高了阴极稳定性和循环性能,这对于先进的储能应用至关重要.
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) 在高温和高压下面临稳定性问题.
- 在严苛的条件下,NaNi1/3Fe1/3Mn1/3O2 (NFM) 阴极表现不佳.
- 开发强大的电解质对于SIB商业化至关重要.
研究的目的:
- 设计一种新的电解质添加剂,用于稳定SIB中的NFM阴极.
- 研究添加剂增强电化学性能的机制.
- 评估改性电解质的长期循环稳定性和实际应用性.
主要方法:
- 合成和表征Ethoxy ((pentafluoro) cyclotriphosphazene (PFPN) 作为一个电解质添加剂.
- 在高温下,在有或没有PFPN的SIB中对NFM阴极进行电化学测试.
- 使用先进技术分析阴极电解质介相 (CEI) 形成和特性.
- 硬币细胞和袋细胞性能评估.
主要成果:
- PFPN有效调节Na+溶解,降低了溶解能量障碍.
- 形成了一个稳定的,离子导电CEI层,富含NaF,NaCl和NaN.
- 在45°C的300个循环后,NFM//Na硬币电池的容量保留从43.34%提高到78.07%.
- PFPN增强了电极的湿透性,并抑制了不必要的副作用.
- NFM//HC全硬币电池在1000个循环中表现出极好的循环稳定性 (每周减弱约0.02%).
- 在500个循环后,Ah级袋式电池实现了83.79%的容量保留.
结论:
- PFPN是一种高效的添加剂,可提高基于NFM的SIB的高温性能和循环稳定性.
- 该添加剂促进了优质的CEI形成和电解质稳定性,解决了SIB运行的关键挑战.
- 这些发现表明,PFPN在高性能,持久的SIB中具有实际应用的潜力.
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