Porous CoO/C polyhedra as anode material for Li-ion batteries
Porous CoO/C polyhedra as anode material for Li-ion batteries
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DOI：
10.1016/j.electacta.2013.07.003
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发表时间：
2013-10
影响因子：
6.6
通讯作者：
Weiwei Yuan;Jun Zhang;D. Xie;Zimin Dong;Qingmei Su;G. Du
中科院分区：
文献类型：
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作者：
Weiwei Yuan;Jun Zhang;D. Xie;Zimin Dong;Qingmei Su;G. Du
采用水热法制备Co 3 O 4多面体，经糖溶液浸渍后在惰性气氛下煅烧，得到了均匀、分级、多孔的CoO/C多面体。每个CoO/C多面体由许多有序的纳米颗粒（约100 nm）组成。作为锂离子电池的负极材料，CoO/C多面体表现出1025 mAh g-1的初始放电容量，并且在100 mA g-1的电流密度下50次循环后保持510 mAh g-1的可逆容量。CoO/C多面体的库仑效率超过99%，倍率性能得到改善。多级结构和高孔隙率有利于电解质的渗透和耐受体积膨胀，是其良好电化学性能的主要原因。
Uniform, hierarchical and porous CoO/C polyhedra were synthesized by impregnating hydrothermally fabricated Co3O4polyhedra with sugar solution followed by calcination in inert atmosphere. Each CoO/C polyhedron was built up of numerous ordered nanoparticles (around 100 nm). As anode material for Li-ion batteries, the CoO/C polyhedra exhibited an initial discharge capacity of 1025 mAh g−1, and remained a reversible capacity of 510 mAh g−1after 50 cycles at a current density of 100 mA g−1. High Coulombic efficiency over 99% and improved rate capability were achieved for the CoO/C polyhedra. Hierarchical structure and high porosity was benefit to the infiltration of electrolyte and tolerant volume expansion, and hence was responsible for the good electrochemical performance.