材料科学
阳极
单斜晶系
锂(药物)
氢氧化物
离子
化学工程
多孔性
法拉第效率
钙钛矿(结构)
纳米技术
电极
复合材料
晶体结构
结晶学
物理化学
物理
工程类
内分泌学
医学
化学
量子力学
作者
Xianlong Zhou,Yiren Zhong,Mei Yang,Qiang Zhang,Jinping Wei
标识
DOI:10.1021/acsami.5b02152
摘要
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(-1) after 200 cycles at 200 mA g(-1) and long-cycling capability of 400 mAh g(-1) even at 1 A g(-1). 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(-1) until 200 cycles at 1 A g(-1). More importantly, after many fast charge-discharge 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.
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