2D Nano‐Channeled Molybdenum Compounds for Accelerating Interfacial Polysulfides Catalysis in Li–S Battery

Author:

Wu Min1,Xing Zhenyu1,Zhu Ran1,Liu Xu1,Feng Yifan1,Shao Wenjie1,Yan Rui1ORCID,Yin Bo1ORCID,Li Shuang1ORCID

Affiliation:

1. College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu 610065 China

Abstract

AbstractThe shuttle effect, which causes the loss of active sulfur, passivation of lithium anode, and leads to severe capacity attenuation, is currently the main bottleneck for lithium‐sulfur batteries. Recent studies have disclosed that molybdenum compounds possess exceptional advantages as a polar substrate to immobilize and catalyze lithium polysulfide such as high conductivity and strong sulfiphilicity. However, these materials show incomplete contact with sulfur/polysulfides, which causes uneven redox conversion of sulfur and results in poor rate performance. Herein, a new type of 2D nano‐channeled molybdenum compounds (2D‐MoNx) via the 2D organic‐polyoxometalate superstructure for accelerating interfacial polysulfide catalysis toward high‐performance lithium‐sulfur batteries is reported. The 2D‐MoNx shows well‐interlinked nano‐channels, which increase the reactive interface and contact surface with polysulfides. Therefore, the battery equipped with 2D‐MoNx displays a high discharge capacity of 912.7 mAh g−1 at 1 C and the highest capacity retention of 523.7 mAh g−1 after 300 cycles. Even at the rate of 2 C, the capacity retention can be maintained at 526.6 mAh g−1 after 300 cycles. This innovative nano‐channel and interfacial design of 2D‐MoNx provides new nanostructures to optimize the sulfur redox chemistry and eliminate the shuttle effect of polysulfides.

Funder

National Natural Science Foundation of China

Sichuan Province Science and Technology Support Program

State Key Laboratory of Polymer Materials Engineering

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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