纳米片
多硫化物
材料科学
硫黄
电解质
锂(药物)
化学工程
空位缺陷
锂硫电池
碳纤维
阴极
纳米技术
电极
复合材料
化学
结晶学
物理化学
冶金
内分泌学
工程类
医学
复合数
作者
Xin Dai,Xu Wang,Guangjun Lv,Zhen Wu,Yan Liu,Junjie Sun,Yongning Liu,Yuanzhen Chen
出处
期刊:Small
[Wiley]
日期:2023-05-01
卷期号:19 (36)
被引量:32
标识
DOI:10.1002/smll.202302267
摘要
The low conductivity of sulfur and the shuttle effect of lithium polysulfides (LiPSs) are the two intrinsic obstacles that limit the application of lithium-sulfur batteries (LSBs). Herein, a sulfur vacancy introduced NiCo2 S4 nanosheet array grown on carbon nanofiber (CNF) membrane (NiCo2 S4-x /CNF) is proposed to serve as a self-supporting and binder-free interlayer in LSBs. The conductive CNF skeleton with a non-woven structure can effectively reduce the resistance of the cathode and accommodate volume expansion during charge-discharge process. The bonding between CNF matrix and NiCo2 S4 nanosheet is enhanced by in situ growth, ensuring fast electron transfer. Besides, the sulfur vacancies in NiCo2 S4 enhance the chemisorption of LiPSs, and the highly active sites at vacancies can accelerate the LiPSs conversion kinetics. LSB paired with NiCo2 S4-x /CNF interlayer achieved improved stability in 500 cycles at 0.2 C and long life of 3000 cycles at 3 C. More importantly, a high areal capacity of 9.69 mAh cm-2 is achieved with a sulfur loading of 10.8 mg cm-2 and a low electrolyte to sulfur (E/S) ratio of 4.8. This work provides insight into the sulfur vacancy in catalysis design for LiPSs conversion and demonstrates a promising direction for electronic defect engineering in material design for LSBs.
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