journal article·2020-06-11

Defect-Rich, Mesoporous Cobalt Sulfide Hexagonal Nanosheets as Superior Sulfur Hosts for High-Rate, Long-Cycle Rechargeable Lithium–Sulfur Batteries

Jun Zhao, Dengke Zhao, Ligui Li, Li Zhou, Xinghua Liang, Zexing Wu, Zhong-Jie Jiang

The Journal of Physical Chemistry C· Volume 124· Issue 23
Publisher page

Abstract

The performance of lithium–sulfur (Li–S) batteries is strongly limited by the sluggish lithium polysulfides (LiPSs) conversion kinetics and LiPSs shuttling. Herein, mesoporous Co 3 S 4 hexagonal nanosheets with sulfur-atom vacancy defects (Co 3 S 4 -DHS) are synthesized via hydrothermally treating the Co 3 (VO 4 ) 2 hexagonal nanosheet parent in the presense of Na 2 S. The sulfur-atom vacancy defects endow Co 3 S 4 -DHS with a significantly enhanced electronic conductivity and superior LiPSs adsorbability. Moreover, the abundant mesoporous textures of Co 3 S 4 -DHS help to maximize the exposure of catalytically active sites toward LiPSs conversion and buffer the negative effects of large volume fluctuation of loaded sulfur during cycling. Benefiting from these aspects, the Li–S batteries employing Co 3 S 4 -DHS/S-based cathodes exhibit a reversible specific capacity of 1090 mA h g –1 at 0.1 C and 750 mA h g –1 at 1 C, as well as a high capacity of 699 mA h g –1 after 400 charge–discharge cycles at 1 C, corresponding to a low capacity fade rate of 0.17% per cycle. This work enriches the way to fabricate defect-rich transition metal sulfides as efficient sulfur host materials for high-rate, long-lifespan rechargeable Li–S batteries.
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Research context

OpenAlex topics: Advanced Battery Materials and Technologies · Advancements in Battery Materials · Advanced battery technologies research

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Affiliations

Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou 510006, P. R. China

Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou 510641, P. R. China

Guangxi Ministry-Province Jointly-Constructed Cultivation Base for State Key Laboratory of Processing for Nonferrous Metal and Featured Materials, MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, and College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China

Guangxi Key Laboratory of Automobile Components and Vehicle Technology, Guangxi University of Science and Technology, Liuzhou 545600, P. R. China

State Key Laboratory Base of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science & Technology, No. 53 Zhengzhou Road, 266042, Qingdao, P. R. China

Funding

State Key Laboratory of Polymer Physics and Chemistry · Ministry of Education of the People's Republic of China · Natural Science Foundation of Guangdong Province · Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, Guangdong University of Petrochemical Technology

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