Carbon-Free CoO Mesoporous Nanowire Array Cathode for High-Performance Aprotic Li鈥揙2 Batteries

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• 作者：Baoshan Wu ; Hongzhang Zhang ; Wei Zhou ; Meiri Wang ; Xianfeng Li ; Huamin Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：October 21, 2015
• 年：2015
• 卷：7
• 期：41
• 页码：23182-23189
• 全文大小：581K
• ISSN：1944-8252

文摘

Although various kinds of catalysts have been developed for aprotic Li鈥揙₂ battery application, the carbon-based cathodes are still vulnerable to attacks from the discharge intermediates or products, as well as the accompanying electrolyte decomposition. To ameliorate this problem, the free-standing and carbon-free CoO nanowire array cathode was purposely designed for Li鈥揙₂ batteries. The single CoO nanowire formed as a special mesoporous structure, owing even comparable specific surface area and pore volume to the typical Super-P carbon particles. In addition to the highly selective oxygen reduction/evolution reactions catalytic activity of CoO cathodes, both excellent discharge specific capacity and cycling efficiency of Li鈥揙₂ batteries were obtained, with 4888 mAh g_CoO^鈥? and 50 cycles during 500 h period. Owing to the synergistic effect between elaborate porous structure and selective intermediate absorption on CoO crystal, a unique bimodal growth phenomenon of discharge products was occasionally observed, which further offers a novel mechanism to control the formation/decomposition morphology of discharge products in nanoscale. This research work is believed to shed light on the future development of high-performance aprotic Li鈥揙₂ batteries.