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Recyclable cobalt-molybdenum bimetallic carbide modified separator boosts the polysulfide adsorption-catalysis of lithium sulfur battery

引用

Science China Materials 2020年第12期63卷 2443-2455页

作者： Ze Zhang Jia-Nan Wang A-Hu Shao Dong-Gen Xiong Jian-Wei Liu Cheng-Yen Lao Kai Xi Shi-Yao Lu Qiu Jiang Ji Yu Huang-Long Li Zhen-Yu Yang R.Vasant Kumar School of Chemistry Nanchang UniversityNanchang 330031China Department of Materials Science and Metalliclurgy University of CambridgeCambridge CB30FSUK Department of Environmental Science and Engineering Department of Applied ChemistrySchool of ScienceKey Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter(Ministry of Education)State Key Laboratory for Electrical Insulation and Power EquipmentXi’an Jiaotong UnivrsityXi’an 710049China Department of Engineering University of CambridgeCB30FA CambridgeUK Department of Chemistry City University of Hong KongTat Chee AvenueKowloonHong KongChina Department of Precision Instrument Tsinghua UniversityBeijing 10084China

The polysulfide shuttling and sluggish redox kinetics,due to the notorious adsorption-catalysis underperformance,are the ultimate obstacles of the practical application of lithium-sulfur(Li-S)*** carbon-based and transition metal compound-based material solutions generally suffer from poor catalysis and adsorption,respectively,despite the performance gain in terms of the ***,we have enhanced polysulfide adsorptioncatalytic capability and protected the Li anode using a complementary bimetallic carbide electrocatalyst,Co3 Mo3 C,modified commercial *** this demonstration,the potentials of bimetal compounds,which have been well recognized in other environmental catalysis,are also extended to Li-S *** with this modified separator,a simple cathode(S/Super P composite)can deliver high sulfur utilization,high rate performance,and excellent cycle stability with a low capacity decay rate of^0.034%per cycle at 1 C up to1000 *** at a high S-loading of 8.0 mg cm^-2 with electrolyte/sulfur ratio=6 m L g^-1,the cathode still exhibits high areal capacity of^6.8 m A h cm^-*** experimental analysis and the first-principles calculations proved that the bimetallic carbide Co3 Mo3 C provides more binding sites for adsorbing polysulfides and catalyzing the multiphase conversion of sulfur/polysulfide/sulfide than monometallic carbide Mo2 ***,the modified separator can be reutilized with comparable electrochemical *** also showed other bimetallic carbides with similar catalytic effects on Li-S batteries and this material family has great promise indifferent energy electrocatalytic systems.

关键词： lithium-sulfur batteries bimetallic carbides electrocatalysts polysulfide adsorption-catalysis modified separators

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