纳米笼
多硫化物
锡
氧化还原
硫黄
材料科学
电化学
化学工程
锂(药物)
溶解
碳纤维
阴极
吸附
纳米颗粒
纳米技术
无机化学
化学
催化作用
电极
电解质
冶金
复合数
有机化学
复合材料
物理化学
内分泌学
医学
工程类
作者
Ning Zhang,Shuangshuang Zheng,Menglong Zhao,Yang Lu,Jinbing Cheng,Ya Yang,Yongsong Luo,Yongsong Luo
出处
期刊:Dalton Transactions
[The Royal Society of Chemistry]
日期:2021-11-30
卷期号:50 (46): 17120-17128
被引量:1
摘要
The lithium polysulfide (LiPS) shuttle effect and low redox kinetics are the key problems that hinder performance improvement and prevent achieving the commercial requirements for lithium-sulfur batteries (LSBs), and the reasonable construction of sulfur hosts is one effective strategy to relieve the polysulfide shuttle effect and improve redox kinetics. Herein, N-doped carbon nanocages decorated with homogeneously dispersed TiN nanoparticles (TiN@C NCs) as multifunctional sulfur hosts are designed for superior LSBs. Carbon nanocages provide space to mitigate volume expansion and provide additional physical adsorption to trap the LiPSs. Polar TiN nanoparticles not only exhibit the chemisorption capacity for LiPSs, but also catalyze and promote the conversion of long-chain LiPSs to Li2S2/Li2S in the reduction process as well as the decomposition of Li2S in the oxidation reaction, which significantly boosts electron/ion transport and decreases the potential barrier. Therefore, the S/TiN@C NC cathode has an excellent electrochemical capacity of 1485.7 mA h g-1 at 0.1 C. In particular, the cathode demonstrates high capacity reversibility after 500 cycles at 3 C with a retention of about 73.1%, which is equivalent to a slow capacity decay rate of 0.053% per cycle.
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