CoMo6聚氧甲酸单元的"滚球碰撞效应"使得温度范围从-20°C到60°C的范围更广,并且可以缓解状石的-S电池
Yiding Li1, Kai Sun1, Yujun Fu1
1School of Materials and Energy, and LONGi Institute of Future Technology, Lanzhou University, Lanzhou, 730000, China.
Advanced materials (Deerfield Beach, Fla.)
|August 3, 2024
概括
安德森型多氧金属酸盐 (TMMo6 POMs) 通过催化多硫化反应来增强硫 (Li-S) 电池分离器. 这种修改改善了容量,循环寿命和离子传输,以保持稳定的电池性能.
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
- 纳米技术 纳米技术
背景情况:
- 硫 (Li-S) 电池具有高的理论能量密度,但由于聚硫化物穿,其周期寿命较差.
- 需要有效的催化剂来改善聚硫化物 (LiPSs) 反应动力学并减轻降解.
研究的目的:
- 调查安德森型聚氧甲酸盐 (TMMo6 POMs) 作为Li-S电池分离器的改性材料.
- 了解TMMo6 POM和LiPS之间的电子转移机制.
- 通过量身定制的催化剂设计来优化Li-S电池性能.
主要方法:
- 合成和表征安德森型多氧甲酸盐 (TMMo6 POMs) 的不同中心金属原子 (Co,Ni,Fe).
- 用TMMo6 POM和石墨烯复合材料对Li-S电池分离器进行修改.
- 电化学测试包括初始容量,循环性能和离子运输研究.
- 在现场实验性表征和反应机制的理论分析.
主要成果:
- TMMo6 POM 证明了 LiPSs 反应的有效催化,改善了原子利用率和导电性.
- CoMo6单元表现出中等的结合能量和最低的吉布斯自由能量,促进了强大的极性键形成.
- 带有CoMo6-石墨烯修饰分离器的Li-S电池实现了高初始容量 (1588.6 mAh g-1在0.2 C) 和出色的循环稳定性 (>3000个循环在5 C).
- 统一的Li+运输维持了超过1900小时,并且在广泛的温度范围内 (-20至60°C) 实现了稳定的循环运行.
结论:
- 安德森型聚氧甲酸盐是提高Li-S电池分离器性能的有希望的材料.
- 在TMMo6 POM中定制中心金属原子,可以调整结合能量和催化活性.
- 这项工作为稳定的Li-S电池运行提供了关于动力学-热力学平衡的见解.
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