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https://hdl.handle.net/2440/131948
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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 2050-7496 |
Statement of Responsibility: | 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 |
Published version: | http://dx.doi.org/10.1039/d1ta01107c |
Appears in Collections: | Aurora harvest 4 Chemical Engineering publications |
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