多硫化物
异质结
锂(药物)
材料科学
储能
硫黄
阴极
化学工程
化学
电极
光电子学
电解质
冶金
热力学
物理化学
物理
工程类
内分泌学
功率(物理)
医学
作者
Jian Wei,Xinyu Qiao,Xiaolin Ye,Bing Chen,Yanbin Zhang,Taotao Wang,Jiawei Hui
标识
DOI:10.1002/ente.202300092
摘要
Lithium–sulfur batteries, due to their various advantages such as their unique theoretical capacity, inexpensive, and environmental friendliness, have become one of the new‐generation energy storage systems. However, during the commercial development of lithium–sulfur batteries, they are limited by obstacles such as the volume expansion, shuttle effect, and low conductivity of S, which eventually lead to slow system reaction kinetics and poor cycling stability. Herein, heterostructured metal–organic framework‐derived Co 3 O 4 /TiO 2 hybrids have been designed. The hollow structure of the Co 3 O 4 is coupled with TiO 2 on the surface to form a heterojunction to construct an internal electric field, which can promote charge transfer and improve reaction kinetics. Meanwhile, Co 3 O 4 /TiO 2 has excellent trapping ability for lithium polysulfide, reducing the shuttle effect and alleviating volume expansion. As the cathode material, the initial discharge capacity of S@Co 3 O 4 /TiO 2 at 0.1C is 1152.7 mAh g −1 . Meanwhile, it has an initial specific capacity of 657 mAh g −1 at 1C, a capacity retention rate of 63.7% after 500 charge/discharge cycles, and an effective cycling stability with a decay rate of 0.072% in each cycle. This indicates that the construction of heterojunctions between materials has some enhancement on the performance of Li–S batteries.
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