多硫化物
硫黄
分离器(采油)
材料科学
化学工程
电化学
氧化还原
碳纤维
电化学动力学
纳米技术
电极
化学
电解质
复合材料
冶金
热力学
复合数
物理
物理化学
工程类
作者
Junpu Zhang,Wen Xi,Peng Du,Zhibin Xie,Youfang Zhang,Rui Wang,Beibei He,Yansheng Gong,Huanwen Wang,Jun Jin
标识
DOI:10.1016/j.electacta.2023.143385
摘要
Lithium-sulfur (Li-S) batteries with high theoretical energy densities offer a promising alternative for next-generation energy storage. However, the poor conductivity, shuttle effect of lithium polysulfides (LiPSs), and large volume expansion upon cycling hinder their application. Hollow nanostructures can play an important role in achieving high sulfur loading, buffering volume expansion, and inhibiting LiPSs shuttling. In this work, MoSSe nanosheets grown on N-doped carbon hollow spheres (MoSSe/NC) are used as both sulfur host and separator to achieve catalytic adsorption and conversion of LiPSs. As a sulfur host, MoSSe/NC can enhance electron/ion transport and alleviate the volume expansion of sulfur during cycling, further accelerating the redox kinetics. The MoSSe/NC-modified separator can also induce interfacial charge modulation and expose more active sites, promoting rapid anchoring and conversion of LiPSs and uniform deposition of Li2S. Theoretical calculations and experiments verify that MoSSe/NC can catalyze the conversion of LiPSs, inhibit the shuttle effect, and effectively improve the electrochemical properties of sulfur. Therefore, the MoSSe/NC based Li-S battery exhibits high initial capacity (1455 mAh g−1), excellent rate performance (891 mAh g−1 at 2 C), and good cycling stability (0.049% capacity decay rate at 800 cycles at 1 C).
科研通智能强力驱动
Strongly Powered by AbleSci AI