处理稳定合金阳极固体电解质介面的形成,组成和形态的一般方法
Yue Gao1, Ran Yi2, Yuguang C Li1
1Department of Chemistry, The Pennsylvania State University , University Park, Pennsylvania 16802, United States.
Journal of the American Chemical Society
|October 31, 2017
概括
研究人员开发了一种用于合金阳极的稳定固体电解质介相 (SEI) 层的新方法. 这种方法通过精确控制SEI的组成和结构来提高电池性能和循环寿命.
科学领域:
- 材料科学
- 电化学
- 电池技术
背景情况:
- 合金阳极为先进的离子电池提供高能量密度.
- 固体电解质相间稳定性 (SEI) 较差,限制了这些阳极的电化学性能.
- 目前的SEI形式缺乏对结构和功能的精确控制.
研究的目的:
- 开发一种用于操纵合金阳极上的SEI形成,组成和形态的一般方法.
- 提高和纳米粒子阳极的稳定性和电化学性能.
- 展示各种合金系统构建强大的SEI的多功能方法.
主要方法:
- 使用点击反应将功能组件对阳极表面进行共价固定.
- 通过控制的固定元件和电解质的电化学分解制造SEI层.
- 在和纳米粒子阳极平台上研究了SEI特性.
主要成果:
- 在分子水平上精确控制SEI的组成和结构.
- 通过共价结合证明了密切的SEI-Li合金接触.
- 优化纳米粒子阳极在完整的细胞中显示出增强的第一周期效率和延长周期寿命.
- 在循环过程中,功能化的SEI表现出稳定的组成和持久的形态.
结论:
- 拟议的共价定方法提供了制造稳定和功能性的SEI的总体策略.
- 这种方法显著提高了合金阳极的电化学性能.
- 这种方法有助于推进下一代高能离子电池技术.
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