1D Insertion Chains Induced Small‐Polaron Collapse in MoS2 2D Layers Toward Fast‐Charging Sodium‐Ion Batteries

Author:

Lv Zhuoran123,Zhao Chendong2,Xie Miao2,Cai Mingzhi4,Peng Baixin2,Ren Dayong2,Fang Yuqiang2,Dong Wujie2,Zhao Wei2,Lin Tianquan13,Lv Ximeng5,Zheng Gengfeng5,Huang Fuqiang123ORCID

Affiliation:

1. State Key Lab of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

2. State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China

3. Zhangjiang Institute for Advanced Study (ZIAS) Shanghai Jiao Tong University Shanghai 201210 China

4. State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

5. Laboratory of Advanced Materials Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University Shanghai 200438 China

Abstract

AbstractMolybdenum disulfide (MoS2) with high theoretical capacity is viewed as a promising anode for sodium‐ion batteries but suffers from inferior rate capability owing to the polaron‐induced slow charge transfer. Herein, a polaron collapse strategy induced by electron‐rich insertions is proposed to effectively solve the above issue. Specifically, 1D [MoS] chains are inserted into MoS2 to break the symmetry states of 2D layers and induce small‐polaron collapse to gain fast charge transfer so that the as‐obtained thermodynamically stable Mo2S3 shows metallic behavior with 107 times larger electrical conductivity than that of MoS2. Theoretical calculations demonstrate that Mo2S3 owns highly delocalized anions, which substantially reduce the interactions of Na−S to efficiently accelerate Na+ diffusion, endowing Mo2S3 lower energy barrier (0.38 vs 0.65 eV of MoS2). The novel Mo2S3 anode exhibits a high capacity of 510 mAh g−1 at 0.5 C and a superior high‐rate stability of 217 mAh g−1 at 40 C over 15 000 cycles. Further in situ and ex situ characterizations reveal the in‐depth reversible redox chemistry in Mo2S3. The proposed polaron collapse strategy for intrinsically facilitating charge transfer can be conducive to electrode design for fast‐charging batteries.

Funder

National Key Research and Development Program of China

Science and Technology Commission of Shanghai Municipality

National Natural Science Foundation of China

China Postdoctoral Science Foundation

Publisher

Wiley

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

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