解锁用于快速充电硫电池的液体硫化学
Fangyi Shi1,2, Xuyun Guo1, Chunhong Chen3
1Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong 999077, People's Republic of China.
Nano letters
|August 24, 2023
概括
研究人员在-硫 (Li-S) 电池中探索了液体硫的形成,发现电流密度控制了滴滴的大小和数量. 这使得快充硫阴极能够保持高容量.
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:
- 硫 (Li-S) 电池具有较高的理论能量密度.
- 在电化学循环过程中控制硫形态对于性能至关重要.
- 了解从液体到固体的硫过渡是先进的Li-S电池设计的关键.
研究的目的:
- 为了研究 Li-S 化学中的液体到固体硫过渡的动态.
- 为了确定电化学参数和硫形态之间的相关性.
- 为开发快充硫阴极提供见解.
主要方法:
- 在石墨烯基底板上对电化学生成的硫的视觉观察.
- 在各种电流密度下对聚硫化物进行受控充电.
- 分析硫滴的大小,数量密度和面积容量.
主要成果:
- 在应用电流密度和液体硫滴的尺寸/数量密度之间发现了定量相关性.
- 面积容量对电流密度变化的敏感性较小.
- 高硫载荷 (4.2 mg cm-2) 的Li-S电池表现出~100%的容量保留,从0.1到3°C.
结论:
- 该研究阐明了Li-S系统中液体-固体硫增长的动力学.
- 对硫滴形成的控制对于快充能力至关重要.
- 这些发现支持优化高电率Li-S电池中硫阴极性能的策略.
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