Co2(OH)2CO3 Nanosheets and CoO Nanonets with Tailored Pore Sizes as Anodes for Lithium Ion Batteries

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• 作者：Xianlong Zhou ; Yiren Zhong ; Mei Yang ; Qiang Zhang ; Jinping Wei ; Zhen Zhou
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：June 10, 2015
• 年：2015
• 卷：7
• 期：22
• 页码：12022-12029
• 全文大小：517K
• ISSN：1944-8252

文摘

Co₂(OH)₂CO₃ nanosheets were prepared and initially tested as anode materials for Li ion batteries. Benefiting from hydroxide and carbonate, the as-prepared sample delivered a high reversible capacity of 800 mAh g^鈥? after 200 cycles at 200 mA g^鈥? and long-cycling capability of 400 mAh g^鈥? even at 1 A g^鈥?. Annealed in Ar, monoclinic Co₂(OH)₂CO₃ nanosheets were transformed into cubic CoO nanonets with rich pores. The pore size had apparent influence on the high-rate performances of CoO. CoO with appropriate pore sizes exhibited greatly enhanced Li storage performances, stable capacity of 637 mAh g^鈥? until 200 cycles at 1 A g^鈥?. More importantly, after many fast charge鈥揹ischarge cycles, the highly porous nanonets were still maintained. Our results indicate that Co₂(OH)₂CO₃ nanosheets and highly porous CoO nanonets are both promising candidate anode materials for high-performance Li ion batteries.