Fabrication of a Cyanide-Bridged Coordination Polymer Electrode for Enhanced Electrochemical Ion Storage Ability

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• 作者：Daisuke Asakura ; Masashi Okubo ; Yoshifumi Mizuno ; Tetsuichi Kudo ; Haoshen Zhou ; Kazumichi Ikedo ; Takashi Mizokawa ; Atsushi Okazawa ; Norimichi Kojima
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：April 19, 2012
• 年：2012
• 卷：116
• 期：15
• 页码：8364-8369
• 全文大小：371K
• 年卷期：v.116,no.15(April 19, 2012)
• ISSN：1932-7455

文摘

Host frameworks with the ability to store guest ions are very important in a wide range of applications including electrode materials for Li-ion batteries. In this report, we demonstrate that the ion storage ability of the cyanide-bridged coordination polymer (Prussian blue analogue, PBA) can be enhanced by suppressing vacancy formation. K-ions in the vacancy-suppressed PBA framework K_1.72Mn[Mn(CN)₆]_0.93路鈻?sub>0.07路0.65H₂O (鈻? a [Mn(CN)₆]^{4鈥?/sup> defect) were electrochemically extracted. The open circuit voltages (OCVs) during K-ion extraction exhibited two specific plateaus at 3.0 and 3.7 V vs Li/Li+. Ex situ X-ray diffraction and IR spectroscopy revealed drastic structural and electronic changes during K-ion extraction. Furthermore, after K-ion extraction, the vacancy-suppressed PBA framework was applied to the cathode material for a Li-ion battery. The charge/discharge experiments revealed that the framework can accommodate a large amount of Li-ions.}