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Type: Journal article
Title: A CoSe-C@C core-shell structure with stable potassium storage performance realized by an effective solid electrolyte interphase layer
Author: Gu, X.
Zhang, L.
Zhang, W.
Liu, S.
Wen, S.
Mao, X.
Dai, P.
Li, L.
Liu, D.
Zhao, X.
Guo, Z.
Citation: Journal of Materials Chemistry A, 2021; 9(18):11397-11404
Publisher: Royal Society of Chemistry
Issue Date: 2021
ISSN: 2050-7488
Statement of
Xin Gu, Li Zhang, Wenchao Zhang, Sailin Liu, Sheng Wen, Xinning Mao, Pengcheng Dai, Liangjun Li, Dandan Liu, Xuebo Zhao and Zaiping Guo
Abstract: Conversion/alloying materials with high theoretical capacity are promising for potassium-ion batteries, although their development is seriously blocked owing to their volume expansion and ineffective solid-electrolyte interphase (SEI) protection. Herein, it is discovered that the performance of the CoSe anode material could be enhanced through a flexibly designed core–shell structure (denoted as CoSe–C@C) and an inorganic compound-rich SEI. The CoSe–C@C electrode exhibits stable cycling performance (432 mA h g⁻¹ at 200 mA g⁻¹ ) over 1000 cycles and outstanding rate capability (233 mA h g⁻¹ at 10 A g⁻¹ ). A reversible conversion mechanism for the potassiation/depotassiation in CoSe is revealed by ex situ X-ray diffraction patterns and high-resolution transmission electron microscope images, while the SEI on the CoSe–C@C surface is found to be inorganic-rich (KF-), which is favourable for K ion diffusion and charge transfer dynamics. These findings would shed light on nanostructure design strategies and our fundamental understanding of the SEI formation in electrolyte engineering for potassium-ion batteries.
Rights: This journal is © The Royal Society of Chemistry 2021
DOI: 10.1039/d1ta01107c
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Chemical Engineering publications

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