材料科学
热液循环
电化学
水溶液
微波食品加热
储能
相(物质)
化学工程
电极
离子
电池(电)
计算机科学
化学
物理化学
工程类
功率(物理)
有机化学
物理
电信
量子力学
作者
Mingqiang Liu,Qinghe Zhao,Hao Líu,Jinlong Yang,Xin Chen,Luyi Yang,Yan-Hui Cui,Weiyuan Huang,Weiqian Zhao,Aoye Song,Yuetao Wang,Ding Shihua,Yongli Song,Guoyu Qian,Haibiao Chen,Feng Pan
出处
期刊:Nano Energy
[Elsevier]
日期:2019-10-01
卷期号:64: 103942-103942
被引量:165
标识
DOI:10.1016/j.nanoen.2019.103942
摘要
Mild aqueous Zn–MnO2 battery attracts lots of attention in energy storage filed due to its low cost, high safety and environmental friendliness. To achieve high-performance in battery, phase evolution processes of MnO2 during synthesis and electrochemical reactions need to be understood. Herein, the phase evolution during microwave hydrothermal and correlated battery performance of β-MnO2 are studied. The results demonstrate a phase evolution mechanism from an initial mixture of vernadite, nsutite, and pyrolusite (β-MnO2) to a final single β-MnO2 phase, along with enhanced structure stability, increased Mn valence, and decreased BET surface area. It is found that only when microwave hydrothermal time (MHT) ≥ 120 min, β-MnO2 showing both high capacity and excellent cycling performance can be obtained. β-MnO2 prepared under a MHT of 120 min shows a high reversible capacity of 288 mA h g−1 with a median voltage of 1.36 V vs. Zn/Zn2+, and high capacity retentions of 91.8% after 200 cycles at 0.5C and 84.3% after 1000 cycles at 4C, respectively. In addition, the formation of inactive ZnMn2O4 during cycling is observed, which contributes to the capacity fading of β-MnO2 after long-term cycling. This research makes a step forward to the practical application of Zn–MnO2 batteries, and contributes to the large-scale energy storage field.
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