首页|Electrochemical Realization of 3D Interconnected MoS3/PPy Nanowire Frameworks as Sulfur-Equivalent Cathode Materials for Li-S Batteries

Electrochemical Realization of 3D Interconnected MoS3/PPy Nanowire Frameworks as Sulfur-Equivalent Cathode Materials for Li-S Batteries

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The development of freestanding and binder-free electrode is an effective approach to perform the inherent capacity of active materials and promote the mechanism study by minimizing the interference from additives.Herein,we construct a freestanding cathode composed of MoS3/PPy nanowires(NWs)deposited on porous nickel foam(NF)(MoS3/PPy/NF)through electrochemical methods,which can work efficiently as sulfur-equivalent cathode material for Li-S batteries.The structural stability of the MoS3/PPy/NF cathode is greatly enhanced due to its significant tolerance to the volume expansion of MoS3 during the lithiation process,which we ascribe to the flexible 3D framework of PPy NWs,leading to superior cycling performance compared to the bulk-MoS3/NF reference.Eliminating the interference of binder and carbon additives,the evolution of the chemical and electronic structure of Mo and S species during the discharge/charge was studied by X-ray absorption near-edge spectroscopy(XANES).The formation of lithium polysulfides was excluded as the driving cathode reaction mechanism,suggesting the great potential of MoS3 as a promising sulfur-equivalent cathode material to evade the shuttle effect for Li-S batteries.The present study successfully demonstrates the importance of structural design of freestanding electrode enhancing the cycling performances and revealing the corresponding mechanisms.

3D-Networkelectrochemicallithium-sulfur batteryMoS3PPy

Hongtao Yu、Andreas Siebert、Shilin Mei、Raul Garcia-Diez、Roberto Félix、Ting Quan、Yaolin Xu、Johannes Frisch、Regan G.Wilks、Marcus B?r、Chun Pei、Yan Lu

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Department for Electrochemical Energy Storage,Helmholtz-Zentrum Berlin für Materialien und Energie GmbH(HZB),Hahn-Meitner Platz 1,14109 Berlin,Germany

Guangdong Province Key Laboratory of Durability for Marine Civil Engineering,School of Civil Engineering,Shenzhen University,Shenzhen,Guangdong 518060,China

Department of Interface Design,HZB,Albert-Einstein-Str.15,12489 Berlin,Germany

Energy Materials In-Situ Laboratory Berlin(EMIL),Albert-Einstein-Str.15,12489 Berlin,Germany

Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy(HI ERN),Albert-Einstein-Str.15,12489 Berlin,Germany

Department of Chemistry and Pharmacy,Friedrich-Alexander-Universität Erlangen-Nürnberg,Egerlandstr.3 91058,Erlangen Germany

Institute of Chemistry,University of Potsdam,14467,Potsdam Germany

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China and Germany Postdoctoral Exchange Program in the Helmholtz-Zentrum Berlin für Materialien und Energie GmbHJoint Lab for Structural Research at the Integrative Research Institute for the Sciences(IRIS Adlershof)National Science Foundation for Young Scientists of China

21704040

2024

10.1002/eem2.12539

能源与环境材料(英文)

能源与环境材料(英文)

ISSN：
年,卷(期)：2024.7(2)