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https://hdl.handle.net/2440/132700
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Type: | Journal article |
Title: | Revealing the magnesium storage mechanism in mesoporous bismuth via spectroscopy and Ab initio simulation |
Author: | Xu, X. Chao, D. Chen, B. Liang, P. Li, H. Xie, F. Davey, K. Qiao, S. |
Citation: | Angewandte Chemie International Edition, 2020; 59(48):21728-21735 |
Publisher: | Wiley |
Issue Date: | 2020 |
ISSN: | 1433-7851 1521-3773 |
Statement of Responsibility: | Xin Xu, Dongliang Chao, Biao Chen, Pei Liang, Huan Li, Dr. Fangxi Xie ... et al. |
Abstract: | Bismuth is a promising alternative to magnesium metal anode. It permits non-corrosive magnesium electrolytes with high oxidative stability, and encourages investigation of high-voltage cathode materials for magnesium ion batteries (MIBs). An in-depth understanding of the mechanism of Mg storage in bismuth is crucial for the search of reliable approaches to boost electrochemical performance of MIBs. Here, we present mesoporous bismuth nanosheets as a model to study the charge storage mechanism of Mg/Bi system. Using a systematic spectroscopy investigation of combined synchrotron-based operando X-ray diffraction, near-edge X-ray absorption fine structure and Raman, for the first time, we demonstrate a reversible two-step alloying reaction mechanism of Bi↔MgBi↔Mg 3 Bi 2 . Ab initio simulation methods disclose formation of the MgBi intermediate, and confirm its high electronic conductivity. This intermediate serves as buffer for the significant volume expansion (204%) and acts to regulate Mg storage kinetics. The mesoporous bismuth nanosheets, as an ideal material for investigation of Mg charge storage mechanism, effectively alleviate volume expansion and endow significant electrochemical performance in lithium-free electrolyte. These findings will benefit mechanistic understandings and advance material designs for MIBs. |
Keywords: | Mg/Bi battery Mg2+ storage mechanism mesoporous bismuth operando synchrotron theoretical computation |
Rights: | © 2020 Wiley-VCH GmbH |
DOI: | 10.1002/anie.202009528 |
Grant ID: | http://purl.org/au-research/grants/arc/DP160104866 http://purl.org/au-research/grants/arc/FL170100154 http://purl.org/au-research/grants/arc/DE20010124 |
Published version: | http://dx.doi.org/10.1002/anie.202009528 |
Appears in Collections: | Physics publications |
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