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Strain Buffering Effect of Quasi-Amorphous Disordered Microstructure Enabling Long-Term Fast Sodium Storage Performance

Abstract

Volume expansion during the discharge and charge process is still challenging for the high-capacity electrode materials. Directly design of active materials with high surface area can overcome this challenge but would inevitably decrease volumetric energy density. Herein, a quasi-amorphous disordered microstructure of MoS2 combined with conductive matrix was designed to improve the cyclability and high rate performance. The hybrid electrode materials with optimized architecture have shown buffering effect of the loosened structure and the enhanced conductivity. Meanwhile, this special structure has favored pseudocapacitive charge storage behavior, further contributing to the excellent electrochemical performance. As expected, after 3000 cycles, the reversible capacities remain as high as 322 mA h g-1 (1 A g-1) and 281.6 mA h g-1 (2 A g-1), both presenting low cyclic fading rates of 0.01% per cycle. After 1000 cycles at 6 A g-1, a capacity of 226.7 mA h g-1 was achieved. Even at an extremely high current density of 45 A g-1, it could still deliver a high capacity of 257.7 mA h g-1. We anticipate that suitable structure modulations might be applied on other electrode materials to meet the optimal electrochemical reactions and kinetic requirements.

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Publication details

The article was received on 20 Sep 2018, accepted on 23 Nov 2018 and first published on 26 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA09172B
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Strain Buffering Effect of Quasi-Amorphous Disordered Microstructure Enabling Long-Term Fast Sodium Storage Performance

    Q. He, S. Zhang, X. Wu, J. Yang and Z. Wen, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA09172B

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