热处理对锌离子电池负极中非晶二氧化锰结晶行为及其电化学性能的影响

Chengyan Gu, Zhenzhong Zhang, Yukai Zhao, F. Zhao, Yana Liu, Youwei Zhang
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引用次数: 0

摘要

本文采用液相共沉淀法制备了无定形二氧化锰(AMO),研究了热处理温度对AMO微观结构、物相组成和作为含水锌锰电池正极材料的电化学性能的影响。结果表明,在250℃时AMO没有结晶,但其结构稳定性提高。当温度为350℃和400℃时,部分AMO结晶成棒状纳米α - MnO2晶体。在540℃下,产物结晶为纳米α - MnO2晶体。继续将温度提高到650℃,产品的结构稳定性进一步提高。热处理导致材料的比表面积和孔隙率降低,这反过来又导致比容量和循环稳定性降低。此外,热处理后的产品在放电过程中容量急剧下降;这是因为电极材料的不可逆相变引起的体积变化在各向异性晶体中难以释放,导致结构崩溃。本研究表明,在整体性能和成本方面,未加热的AMO优于热处理的AMO作为含水Zn-MnO2电池正极材料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Heat Treatment on the Crystallization Behavior of Amorphous Manganese Dioxide and its Electrochemical Properties in Zinc‐Ion Battery Cathodes
Herein, amorphous manganese dioxide (AMO) is prepared by the liquid‐phase coprecipitation method, the effect of heat treatment temperature on the microstructure, and phase composition of AMO and the electrochemical properties as cathode materials for aqueous Zn–MnO2 batteries are investigated. The results show that the AMO didn't crystallize at 250 °C, but its structure stability increases. When the temperature is 350 and 400 °C, part of the AMO crystallizes into rod‐shaped nano‐α‐MnO2 crystals. At 540 °C, the products crystallize into nano‐α‐MnO2 crystals. Continuing to increase the temperature to 650 °C, the structural stability of the products is further improved. Heat treatment leads to reduced specific surface area and porosity of the material, which in turn leads to reduced specific capacity and cycling stability. In addition, the heat‐treated products show a sharp drop in capacity during the discharge process; this was because the volume change caused by the irreversible phase change of the electrode material is difficult to release in the anisotropic crystal, resulting in the collapse of the structure. This study shows that unheated AMO is better than heat‐treated AMO as a cathode material for aqueous Zn–MnO2 battery cathode material in terms of overall performance and cost.
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