在硫化聚合物阴极中的结构转化使可充电的长寿命电池成为可能
Shen Wang1, Bingyu Lu1, Diyi Cheng1
1Department of Nanoengineering, University of California, San Diego, La Jolla, California 92093, United States.
Journal of the American Chemical Society
|April 18, 2023
概括
硫电池中的硫化聚烯 (SPAN) 阴极在第一个循环中由于脱而丧失容量. 优化SPAN合成可以显著减少初始容量损失,从而提高电池性能.
科学领域:
- 材料科学
- 电化学
- 聚合物化学
背景情况:
- 硫化聚烯 (SPAN) 是-硫 (Li-S) 电池的有希望的阴极材料,以其长周期寿命而闻名.
- SPAN的精确分子结构和电化学反应机制在很大程度上尚未确定.
- 一个重大挑战是SPAN阴极的第一周期不可逆转容量损失 (ICL) 超过25%.
研究的目的:
- 阐明SPAN的分子结构和电化学反应机制.
- 了解SPAN阴极中第一周期不可逆转的容量损失的起源.
- 制定减轻ICL和提高基于SPAN的Li-S电池性能的策略.
主要方法:
- 一个SPAN薄膜平台的制造.
- 使用全面的分析技术.
- 电化学表征和现场/现场分析.
主要成果:
- SPAN的第一循环容量损失归因于分子内脱水和硫损失,增加了芳香度和电子导电性 (> 100 ×).
- 导电性碳添加剂对于推动反应完成至关重要.
- 一种新的合成方法使ICL减少了50%以上.
结论:
- 该研究阐明了SPAN在Li-S电池的初始容量损失背后的机制.
- 获得的洞察力为设计先进的硫化聚合物阴极材料提供了路线图.
- 基于拟议的机制的优化合成显著提高了SPAN阴极性能.
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