在高温下为长寿命的离子电池构建耐溶解介面.
Wenting Deng1,2,3,4, Xiaofan Du2,3,4, Gaojie Xu2,3,4
1College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China.
概括
一种新的添加剂,二二氧化 (NaDFBOP),提高了离子电池 (SIB) 的高温性能. 这通过创建稳定的相间层来提高循环寿命,这对于商业化至关重要.
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:
- 可充电离子电池 (SIBs) 面临着在高温下循环寿命较低的挑战.
- 介相层的不稳定性,特别是碳酸盐溶剂中的NaF溶解性,限制了SIB的性能.
研究的目的:
- 为了提高商业SIB的高温周期寿命.
- 为了研究一种新型添加剂,二二氧化 (NaDFBOP) 对SIB性能的影响.
主要方法:
- 合成NaDFBOP并将其引入NaPF6-碳酸盐电解质.
- 在30°C和50°C时对NaNi1/3Fe1/3Mn1/3O2 (NFM) /硬碳 (HC) SIB进行电化学测试.
- 理论计算和材料表征来分析相间层的形成.
主要成果:
- 添加NaDFBOP显著改善了循环寿命,在30°C 1000个循环后保持85.45%的容量,在50°C 500个循环后保持90.76%.
- 理论计算表明DFBOP-离子与Na+相互作用,NaDFBOP很容易分解.
- 描述揭示了NaDFBOP促进了强大的,耐溶解的相间层与含氧酸盐的物种和NaF.
结论:
- 设计功能添加剂对于改善SIB高温循环寿命至关重要.
- NaDFBOP有效地构建了耐溶解接口,增强了SIB的稳定性和寿命.
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