多重功能键 长周期离子电池的集成介面.
Yongsheng Huang1, Qingqing Zhang1, Xiao-Guang Sun2
1Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China.
研究人员开发了一种新的电解质添加剂策略,用于离子电池 (SIB),使用succinonitrile,NaPF6和FEC. 这种方法增强了接口稳定性,显著改善了SIB的长期循环性能和容量保留.
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) 对电网存储具有前景,但电极/电解质界面稳定性不佳.
- 电解质分解和过渡金属溶解导致SIBs的快速性能降低.
研究的目的:
- 开发一种策略来调节SIB中电极/电解质间相.
- 改善SIB的长期循环稳定性和性能.
主要方法:
- 通过三重合的多种功能键的集成苏奇尼尼特 (SN),六酸 (NaPF6),化乙烯碳酸盐 (FEC).
- 电解质溶解结构和界面层形成的理论计算和实验验证.
- 使用多种表征方法对接口化学进行尸检后分析.
主要成果:
- 重构Na+和ClO4-溶解结构,导致Na+-FEC协调增加和Na+-PC相互作用减弱.
- 形成一个由氧化 (NaNxOy),化 (NaF) 和氧化化合物 (NaPxOy) 组成的合规界面层.
- 一个3Ah袋式全电池 (硬碳//NaNi1/3Fe1/3Mn1/3O2) 在1000个循环后实现了90.4%的容量保留.
结论:
- 开发的电解质配方与集成的功能键显著提高SIBs的界面稳定性.
- 这一策略有效地抑制了电解质分解,并改善了长期循环性能.
- 为设计用于稳定和耐用的SIB的先进电解质提供了一条新途径.
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