对电池电解质中相间形成的潜在依赖ATR-SEIRAS和EQCM-D分析
Katherine Betts1, Yuhan Jiang1, Michael Frailey1
1Department of Chemistry and Biochemistry, University of Nevada, Las Vegas, Nevada 89154, United States.
ACS applied materials & interfaces
|November 4, 2024
概括
这项研究比较了双价电池的电解质,揭示了不同的成分和添加剂如何影响固体电解质介相 (SEI) 层,这对电池性能和寿命至关重要.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 二等电池技术,特别是离子电池 (ZIBs),正在引起人们的兴趣.
- 了解电解质的行为和固体电解质间相 (SEI) 形成对于ZIB的发展至关重要.
- 与离子电池相比,ZIB中的现场SEI形成存在有限的研究.
研究的目的:
- 为了比较研究三种电解质的界面行为:ZnSO4,ZnOTF和一个Zn(TFSI) 2/LiTFSI混合水盐电解质.
- 为了评估一个酸添加剂对电解质/电极接口动态的影响.
- 为了阐明在初始充/放电周期期间电极接口的电位依赖的结构和组成变化.
主要方法:
- 减弱总反射表面增强红外吸收光谱 (ATR-SEIRAS) 用于监测界面组成.
- 电化学石英晶微平衡与散射监测 (EQCM-D) 分析吸附层的质量和结构特性.
- 在含有和不含乙的水溶液中对界面行为的比较评估.
主要成果:
- 水性ZnSO4形成一个多孔的Zn4SO4(OH) 6·xH2O层在负电位和二硫酸盐在正电位.
- ZnOTF电解质显示了CF3SO3-离子的重定向和表面吸附,有利于CF3组在正电位上.
- 乙二添加剂在负电位上增强了电极稳定性,形成了粘弹性被动化层.
- 盐水电解质表现出极好的表面稳定性和扩大了潜在窗口,形成了一个薄而刚性的SEI层 (0.7μg cm-2).
结论:
- 电解质组成和溶剂条件显著影响ZIB的界面层的形成和特性.
- 最初的充/放电周期通过持久的表面转换对ZIB的长期循环性能产生了关键影响.
- 了解这些界面动态是优化ZIB电解质设计以提高稳定性和性能的关键.
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