多硫化物
硫黄
锂硫电池
异质结
化学
电化学
无机化学
材料科学
催化作用
化学工程
电解质
电极
物理化学
冶金
有机化学
工程类
光电子学
作者
Yun Zhao,Huanyu Zhang,Hualin Ye,Dan Zhao,Jim Yang Lee,Limin Huang
标识
DOI:10.1002/smtd.202300610
摘要
Abstract High sulfur loading and long cycle life are the design targets of commercializable lithium–sulfur (Li–S) batteries. The sulfur electrochemical reactions from Li 2 S 4 to Li 2 S, which account for 75% of the battery's theoretical capacity, involve liquid‐to‐solid and solid‐to‐solid phase changes in all Li–S battery electrolytes in use today. These are kinetically hindered processes that are exacerbated by a high sulfur loading. In this study, it is observed that an in situ grown bimetallic phosphide/black phosphorus (NiCoP/BP) heterostructure can effectively catalyze the Li 2 S 4 to Li 2 S reactions to increase the sulfur utilization at high sulfur loadings. The NiCoP/BP heterostructure is a good polysulfide adsorber, and the electric field prevailing at the Mott−Schottky junction of the heterostructure can facilitate charge transfer in the Li 2 S 4 to Li 2 S 2 liquid‐to‐solid reaction and Li + diffusion in the Li 2 S 2 to Li 2 S solid‐state reaction. Consequently, a sulfur cathode with the NiCoP/BP catalyst can deliver a specific capacity of 830 mAh g −1 at the sulfur loading of 6 mg cm −2 for 500 cycles at the 0.5 C rate. High sulfur utilization is also possible at a higher sulfur loading of 8 mg cm −2 for 440 cycles at the 1 C rate.
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