Manganese Oxide/Carbon Yolk鈥揝hell Nanorod Anodes for High Capacity Lithium Batteries

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• 作者：Zhengyang Cai ; Lin Xu ; Mengyu Yan ; Chunhua Han ; Liang He ; Kalele Mulonda Hercule ; Chaojiang Niu ; Zefan Yuan ; Wangwang Xu ; Longbing Qu ; Kangning Zhao ; Liqiang Mai
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：January 14, 2015
• 年：2015
• 卷：15
• 期：1
• 页码：738-744
• 全文大小：437K
• ISSN：1530-6992

文摘

Transition metal oxides have attracted much interest for their high energy density in lithium batteries. However, the fast capacity fading and the low power density still limit their practical implementation. In order to overcome these challenges, one-dimensional yolk鈥搒hell nanorods have been successfully constructed using manganese oxide as an example through a facile two-step sol鈥揼el coating method. Dopamine and tetraethoxysilane are used as precursors to obtain uniform polymer coating and silica layer followed by converting into carbon shell and hollow space, respectively. As anode material for lithium batteries, the manganese oxide/carbon yolk鈥搒hell nanorod electrode has a reversible capacity of 660 mAh/g for initial cycle at 100 mA/g and exhibits excellent cyclability with a capacity of 634 mAh/g after 900 cycles at a current density of 500 mA/g. An enhanced capacity is observed during the long-term cycling process, which may be attributed to the structural integrity, the stability of solid electrolyte interphase layer, and the electrochemical actuation of the yolk鈥搒hell nanorod structure. The results demonstrate that the manganese oxide is well utilized with the one-dimensional yolk鈥搒hell structure, which represents an efficient way to realize excellent performance for practical applications.