用于高性能硫电池的水性超分子结合剂
Ruliang Liu1, Jiaxin Ou1, Lijun Xie1
1School of Chemistry and Materials Science, Guangdong University of Education, Guangzhou 510303, China.
Polymers
|June 28, 2023
概括
一种新型,环保的超分子粘合剂 (HUG) 通过防止电极变形和聚硫化物穿来提高硫 (Li-S) 电池的性能,从而实现长时间,高容量的能量存储.
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
- 聚合物化学 聚合物化学
背景情况:
- 硫 (Li-S) 电池具有高的理论能量密度,但面临着诸如电极变形和聚硫化物穿等挑战.
- 目前的电极制备方法也可能导致环境污染,阻碍实际应用.
研究的目的:
- 为Li-S电池开发一种水溶性,绿色和环保的粘合剂.
- 通过减轻电极降解和聚硫化物问题来改善Li-S电池的长周期寿命和稳定性.
主要方法:
- 通过用HDI-UPy修改 guar gum (GG) 来合成一种超分子结合剂 (HUG),该结合剂包含酸盐和胺基.
- 由共价键和键形成的HUG的纳米网结构的特征,以及其聚硫化物吸附能力.
- 使用HUG粘合剂的Li-S电池的制造和电化学测试.
主要成果:
- 由于其3D纳米网结构,HUG粘合器有效地抵抗电极散体变形.
- HUG显示了聚硫化物的强烈吸附,显著抑制了穿效应.
- 带有HUG的Li-S电池在1C下200个循环后达到640mAhg-1的高可逆容量,库伦比效率为99%.
结论:
- 合成的HUG粘合剂是先进的Li-S电池电极设计的有希望的,可持续的解决方案.
- HUG有助于提高Li-S电池的电化学性能和循环稳定性.
- 这项工作为更绿色,更高效的Li-S电池技术铺平了道路.
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