Co3O4-Carbon Cloth free standing cathode for lithium sulfur battery

2nd International Conference on Energy Materials and Applications

材料科学;能源学

Xu, Jing^1 ; Su, Dawei^1 ; Wang, Guoxiu^1

Centre for Clean Energy Technology, University of Technology Sydney, NSW

2007, Australia^1

关键词: Current collector;    Cycling stability;    Electrochemical energy storage;    Electrochemical performance;    Electron transport;    Free diffusion;    Lithium sulfurs;    Sulfur loading;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/222/1/012013/pdf
DOI  :  10.1088/1757-899X/222/1/012013

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Lithium-sulfur (Li-S) battery has been considered to be one of the most promising next-generation electrochemical energy-storage systems due to its high theoretical energy of 2600 Wh kg-1with low cost. The insulating nature of both sulfur and the dissolution of polysulfides are the two primary challenges for the application of lithium sulfur batteries. Here, we developed a binder-free cathode by chemisorption of Co3O4to carbon cloth (CC), which was used as a 3D current collector to accommodate a large amount of sulfur, multiwall carbon nanofiber (MWCNF) and carbon black (CB) hybrids within the conductive scaffold, enabling the fabrication of ultrahigh sulfur loaded electrodes. The interconnected carbon fibers established a long-range conductive matrix for an efficient electron transport, the multiple conductive pathways guarantee high sulfur utilization. More importantly, the high electrolyte absorbability of the Co3O4-CC-S current collector facilitates well-localized polysulfides within the Co3O4-CC-S, meanwhile, the polar Co3O4could also effectively entrapped the intermediated polysulfides preventing their free diffusion to the lithium anode, guaranteeing good cycling stability. Consequently, the Co3O4-CC-S electrodes exhibit excellent electrochemical performance with sulfur loading of 4.3 mg cm-2.