阴极
材料科学
水溶液
电流密度
插层(化学)
电化学
化学工程
无机化学
电压
电池(电)
电流(流体)
离子
纳米技术
电极
化学
电气工程
热力学
物理
物理化学
功率(物理)
工程类
有机化学
量子力学
作者
Min Mao,Xingxing Wu,Yi Hu,Qunhui Yuan,Yan‐Bing He,Feiyu Kang
标识
DOI:10.1016/j.jechem.2020.04.061
摘要
Aqueous Zinc-ion batteries (ZIB) are attracting immense attention because of their merits of excellent safety and quite cheap properties compared with lithium-ion batteries (LIB). Manganese oxide is one of the most important cathode materials of ZIB. In this paper, α-Mn2O3 used as cathode of ZIB is synthesized via Metal-Organic Framework (MOF)-derived method, which delivers a high specific capacity of 225 mAh g−1 at 0.05 A g−1 and 92.7 mAh g−1 after 1700 cycles at 2 A g−1. The charge storage mechanism of α-Mn2O3 cathode is found to greatly depend on the discharge current density. At lower current density discharging, the H+ and Zn2+ are successively intercalated into the α-Mn2O3 before and after the “turning point” of discharge voltage and their discharging products present obviously different morphologies changing from flower-like to large plate-like products. At a higher current density, the low-voltage plateau after the turning point disappears due to the decrease of amount of Zn2+ intercalation and the H+ intercalation is dominated in α-Mn2O3. This study provides significant understanding for future design and research of high-performance Mn-based cathodes of ZIB.
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