期刊
ENERGY STORAGE MATERIALS
卷 48, 期 -, 页码 133-144出版社
ELSEVIER
DOI: 10.1016/j.ensm.2022.03.003
关键词
Li-S batteries; Defect engineering; Indium oxide; Polysulfides catalysis; Modified separators
资金
- Joint Funds of the Natural Science Basic Research Project of Shaanxi Province [2021JLM-23]
- University Joint Project of Shaanxi Province [2021GXLH-Z-067]
- Natural Science Foundation of Shaanxi Provincial [2020JQ-049]
- China Postdoctoral Science Foundation [2018M643629]
- National Natural Science Foundation of China [51801144, 51602246]
This study reports defect-rich electrocatalysts composed of carbon spheres and In2O3-x nanoparticles for lithium-sulfur batteries. The research finds that an appropriate quantity of oxygen vacancies can enhance the chemical adsorption and catalytic ability of lithium polysulfides, leading to excellent rate performance and low fading rate.
Defect engineering plays a key role in lithium-sulfur (Li-S) batteries due to the altering of electronic states caused by defects that provide a promising opportunity to realize high-efficiency surface catalysis. Oxygen vacancies (OVs), the common defects in metal oxides, are often used to immobilize and catalyze lithium polysulfides (LiPSs). However, little effort has been devoted to developing novel oxygen defects manufacturing strategies and controlling its concentration to obtain an ideal effect. Herein, defect-rich electrocatalysts composed of In2O3-x nanoparticles and carbon spheres (CS) for Li-S batteries are reported by hydrothermal composition. Both experiments and theoretical calculations indicate that an appropriate quantity of oxygen vacancies can enhance the chemical adsorption and catalytic ability of LiPSs. As expected, the In2O3-x @CS-0.6/rGO-based cell displays an outstanding rate performance of 872 mAh g(-1) at 3 C and a low fading rate of 0.058% each cycle after 100 cycles at 0.2 C, as well as a favorable areal capacity of 6.98 mAh cm(-2) under high sulfur mass loading of 6.81 mg cm(-2). This work furnishes a newness strategy to the rational design of oxygen vacancies of metal oxides and boosts the development of defect engineering in electrochemical applications.
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