Yana Liu, Fangxia Zhao, Haoyi Chen, Xingfeng Tang, Zhenzhong Zhang, Chengyang Gu, Hong Chang
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引用次数: 0
Abstract
In order to explore the crystallization behavior of Co-doped amorphous manganese dioxide(Co-doped AMO) and to investigate the electrochemical properties of its different crystallization products as cathodes for aqueous zinc ion batteries. In this work, the effects of heat treatment temperature on the microstructure and phase composition of Co-doped AMO and their electrochemical properties of Zn-MnO2 battery cathode materials are systematically investigated. The results show that Co-doping increases the crystallization temperature of pure AMO. When the heat treatment temperature is 400 °C, Co-doped AMO is amorphous. At 500 and 550 °C, part of the Co-doped AMO crystallizes into tetragonal spinel structured (Co, Mn)(Co, Mn)2O4 material between MnCo2O4 and Mn3O4. At 650 °C, the crystallized product is completely nano-α-Mn(Co)O2 crystal. The maximum discharge specific capacities and the retention rate after 100 cycles of the samples at 100 mA g−1 are 325.40 mAh g−1, 86.88%; 217.00 mAh g−1, 13.94%; 186.68 mAh g−1, 41.01%; and 149.03 mAh g−1, 31.27% for the unheated and 400, 550, 650 °C heat-treated samples, respectively. It is proved that the Co-doped AMO without heat treatment is superior to the partially or fully crystallized materials in terms of comprehensive performance and cost as cathode materials for AZIB.
为了探索掺杂 Co 的无定形二氧化锰(Co-doped AMO)的结晶行为,并研究其不同结晶产物作为水性锌离子电池阴极材料的电化学性能。本文系统研究了热处理温度对 Co 掺杂 AMO 的微观结构和相组成的影响,以及它们作为 Zn-MnO2 电池阴极材料的电化学性能。结果表明,Co 掺杂会提高纯 AMO 的结晶温度。当热处理温度为 400 ℃ 时,掺 Co 的 AMO 呈无定形。在 500 和 550 ℃ 时,部分掺 Co 的 AMO 结晶成介于 MnCo2O4 和 Mn3O4 之间的四方尖晶石结构 (Co, Mn)(Co, Mn)2O4 材料。650 °C 时,结晶产物完全是纳米α-Mn(Co)O2 晶体。样品在 100 mA g-1 下循环 100 次后的最大放电比容量和保持率分别为:未加热样品 325.40 mAh g-1,86.88%;热处理样品 217.00 mAh g-1,13.94%;热处理样品 186.68 mAh g-1,41.01%;热处理样品 149.03 mAh g-1,31.27%。事实证明,作为 AZIB 的阴极材料,未经热处理的掺 Co AMO 在综合性能和成本方面均优于部分结晶或完全结晶的材料。
期刊介绍:
The journal Crystal Research and Technology is a pure online Journal (since 2012).
Crystal Research and Technology is an international journal examining all aspects of research within experimental, industrial, and theoretical crystallography. The journal covers the relevant aspects of
-crystal growth techniques and phenomena (including bulk growth, thin films)
-modern crystalline materials (e.g. smart materials, nanocrystals, quasicrystals, liquid crystals)
-industrial crystallisation
-application of crystals in materials science, electronics, data storage, and optics
-experimental, simulation and theoretical studies of the structural properties of crystals
-crystallographic computing