隐锰铁矿
电化学
插层(化学)
锰
化学
阴极
双锰矿
无机化学
热液循环
电极
锌
离子
材料科学
矿物学
化学工程
冶金
氧化锰
有机化学
物理化学
工程类
作者
Jonghyuk Lee,Jeh Beck Ju,Won Il Cho,Byung Won Cho,Si Hyoung Oh
标识
DOI:10.1016/j.electacta.2013.08.136
摘要
The structural and electrochemical properties of manganese dioxide with 3 × 3 tunnels bearing the crystallographic structure of the mineral todorokite were investigated for use as a new cathode material for zinc ion cells. The large 3 × 3 tunnel of todorokite facilitates fast Zn2+ diffusion to the inner region of a particle compared to the conventional medium-sized 2 × 2 tunnels of cryptomelane. Todorokite was synthesized by the hydrothermal treatment of layered Na-birnessite in a concentrated Mg-containing solution according to a known method. In electrochemical studies, a promising discharge capacity of 108 mA h/g at C/2 and a good rate performance were observed in the potential range of 0.7 V–2.0 V. Structural and morphological analyses of the discharged and charged electrodes indicate that a reversible intercalation of zinc ions into the tunnel occurs during the discharge–charge process.
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