2S反被动化沉积,由电化学自生成的酸分子介质引导,用于硫电池
Lu Chen1, Jian Guo2, Wenwei Wu1
1School of Chemical Science and Engineering, and State Key Laboratory of Cardiovascular Diseases, Shanghai East Hospital, Tongji University, Shanghai, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|January 20, 2026
概括
这项研究引入了一种用于高能硫 (Li-S) 电池的新型分子媒介系统. 它通过引导硫化核化和防止被动化,提高了硫的利用率和电池的稳定性.
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:
- 硫 (Li-S) 电池在理论上具有高的能量密度,但面临着诸如低硫利用率和聚硫化物穿效应等挑战.
- 2S膜的被动化也阻碍了高能Li-S电池的实际部署.
研究的目的:
- 通过开发一种新型的阴极材料来解决Li-S电池的局限性,该材料可以提高硫的利用率和电化学稳定性.
- 研究在控制Li2S核和薄膜形成中的in situ生成Li3PS4分子介质的作用.
主要方法:
- 使用在Ti3C2Tx纳米板 (TNS) 上生长的3D-硫共价无机框架 (P-S CIF) 制造阴极.
- 电化学循环观察在放电过程中Li3PS4介质的现场生成.
- 分析Li3PS4介导,PS-CIF的空间封闭和TNS的聚硫化固定的协同效应.
主要成果:
- 在0.1A g-1下达到967 mAh g-1的初始容量,在1000个循环后在1A g-1下保持673 mAh g-1的低衰变率 (每周期0.022%).
- 在9.8毫克的高负载下,具有6.24 mAh cm-2的高面积容量.
- 通过Li3PS4介导核化成功抑制Li2S聚合和被动化,形成稳定的Li3PS4@Li2S分子.
结论:
- 开发的TNS/PS CIF阴极与现场生成的Li3PS4介质显著提高了Li-S电池的性能和稳定性.
- 这种分子级设计范式为推进实用的高性能Li-S电池提供了一个有前途的战略.
- 在硫宿主中整合结构精度和电化学功能是未来电池开发的关键.
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