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Cr-induced enhancement of structural stability in δ-MnO2 for aqueous Zn-ion batteries
Ding, Xinying1; Wen, Yuanbin1; Qing, Chen1; Wei, Yaru2; Wang, Pengcheng1; Liu, Jingyi1; Peng, Zhanhong1; Song, Yihui1; Chen, Houyang2; Rong, Qian1
2024-05-30
摘要delta-MnO2 was proposed as a promising cathode material for aqueous Zn-ion batteries. Nonetheless, its potential application has been impeded by its unstable crystal structure and sluggish reaction kinetics with Zn ions. Herein, we utilized Cr to modify delta-MnO2 by a simple hydrothermal method to develop cathode materials for aqueous Zn-ion batteries with better stability and electron transport properties. The introduction of Cr enhanced the specific capacity and cycling stability of delta-MnO2, in particular, the 3% Cr doped delta-MnO2 electrode exhibited a large specific capacity of 229.2 mAhg(-1) at 0.1 Ag(-1) and an excellent capacitance retention of 86.0% after performing 300 cycles. The density functional theory (DFT) calculations indicate that the introduction of Cr decreases the band gap of MnO2 and enhances electron migration in the electrode material. Meanwhile, the introduction of Cr substantially improved the Zn ion adsorption and enhanced the binding energy of delta-MnO2, indicating that the addition of Cr promoted the interaction between the Cr doping delta-MnO2 (Cr-MnO2) electrode materials with Zn ions, while making the structure of the electrode materials more stable. As a result, this suppresses the Jahn-Teller distortion and reduces the solvation and phase transition of Mn.
关键词Aqueous Zn-ion batteries Specific capacity Cycling stability Cr doped delta-MnO2
DOI10.1016/j.jallcom.2024.174041
发表期刊JOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
卷号986页码:9
通讯作者Qing, Chen(chenqing@ynnu.edu.cn) ; Chen, Houyang(chenhouyang@cigit.ac.cn) ; Rong, Qian(qianrong1993@126.com)
收录类别SCI
WOS记录号WOS:001206804300001
语种英语