硫黄
化学工程
黄原胶
材料科学
阴极
无机化学
化学
电化学
复合材料
有机化学
电极
物理化学
工程类
流变学
作者
Yi-Pei Chuang,Jin‐Long Hong
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2021-09-09
卷期号:4 (9): 10213-10221
被引量:8
标识
DOI:10.1021/acsaem.1c02054
摘要
The volume change and shuttle effect of sulfur are detrimental to the stability and electrochemical performance of the sulfur cathode in lithium–sulfur (Li–S) batteries. In this study, a triple cross-linked (TC) network system, containing a chemical covalent bond, physical hydrogen bond (H bond), and ionic bond, was designed and fabricated to deal with the shuttle effect and volume expansion of the sulfur cathode. The TC system was derived from a facile cross-linking reaction of xanthan gum, sodium polyacrylate, and Zn2+ metal ions at elevated temperature. The densely packed cross-linked network structure in the TC system provides the desired mechanical robustness for sustaining the volume change of sulfur during cycling, whereas the zinc ions in the TC system preferably react with lithium polysulfides to limit the detrimental shuttle effect. Thus, the corresponding TC binder constructed an efficient sulfur cathode with superior stability and excellent capacitance retention of 892 mAh g–1 at 0.2 C for 100 cycles and 770 mAh g–1 at 1 C for 300 cycles.
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