双金属片
硒化物
碳纳米管
材料科学
锂(药物)
复合材料
硫黄
碳纤维
纳米管
化学工程
复合数
硒
金属
冶金
医学
工程类
内分泌学
作者
Xiaofeng Cai,Huinan Pan,Jing Zhang,Xiulian Qiu,Xinyu Zhao,Weimin Zhao,Wei Yang,Shengzhou Chen
出处
期刊:Energy & Fuels
[American Chemical Society]
日期:2024-03-14
卷期号:38 (7): 6478-6488
标识
DOI:10.1021/acs.energyfuels.4c00180
摘要
The cathode material of the lithium–sulfur (Li–S) battery poses several challenges, including inadequate conductivity, the "shuttle effect", and volume expansion, all contributing to its reduced cycle lifespan. To address these issues, high-performance Li–S batteries can be manufactured by using transition metal selenide nanomaterials. These nanomaterials exhibit polarity, porosity, electrochemical catalytic activity, and high conductivity, making them well-suited hosts for sulfur cathodes. In this study, a metal–organic framework material was employed as a precursor to produce hollow dodecahedral transition metal selenides. This involved combining the precursor with selenium powder and subjecting it to high-temperature calcination. By leveraging bimetallic synergism and incorporating carbon nanotubes, the material's conductivity was improved, providing a conductive pathway for electron transport. The hollow ZnSe/CoSe2 structure's surface is interconnected by carbon nanotubes, forming a conductive network. This arrangement facilitates efficient sulfur utilization and prevents structural collapse during battery cycling. Moreover, ZnSe/CoSe2 enhances the chemical anchoring of polysulfide, promotes polysulfide transformation, and induces homogeneous nucleation of Li2S. Experimental results demonstrate excellent electrochemical performance when 50 mg of carbon nanotubes. At a rate of 0.05 C, the initial discharge specific capacity reaches 1225.75 mA h·g–1, while at 1 C, it is 439.35 mA h·g–1. After 200 cycles, the battery exhibits a capacity retention of 71.25% with a reversible capacity of 313.08 mA h·g–1.
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