Electrodeposition of three-dimensional macro-/mesoporous Co3O4 nanosheet arrays as for ultrahigh rate lithium-ion battery
Electrodeposition of three-dimensional macro-/mesoporous Co3O4 nanosheet arrays as for ultrahigh rate lithium-ion battery
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DOI：
10.1016/j.electacta.2014.08.003
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发表时间：
2014-10
影响因子：
6.6
通讯作者：
Xiaoyong Fan;Yong Shi;Lei Gou;Donglin Li
中科院分区：
文献类型：
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作者：
Xiaoyong Fan;Yong Shi;Lei Gou;Donglin Li
以化学镀法制备的三维大孔铜为基体，电沉积β-Co（OH）2纳米片阵列，经退火处理制备三维大孔/介孔Co 3 O 4纳米片阵列电极。作为锂离子电池负极材料，其电化学性能优异，在0.2A/g电流下首次循环可逆容量高达967 mAh/g，循环稳定性良好（可逆容量在1A/g下500次循环后保持840 mAh/g），和优异的高倍率容量（在20 A/g下的可逆容量保持为在0.1A/g下的第一循环的可逆容量的38.0%）。其优异的电化学性能归因于其独特的形貌。三维多孔铜基底的大孔、Co 3 O 4纳米片的中孔以及Co 3 O 4纳米片之间的空隙可以提供锂离子快速传输通道，直接生长在三维多孔铜基底上的Co 3 O 4纳米片可以提供电子快速传输通道。
Three dimensional (3-D) macro-/mesoporous Co3O4nanosheet arrays electrode is produced by annealing β-Co(OH)2nanosheet arrays electrodeposited on the 3D macroporous copper substrate which is prepared by electroless plating. As for anode of lithium-ion battery, it displays excellent electrochemical performance, such as high reversible capacity of 967 mAh/g in the first cycle at 0.2 A/g, excellent cycleability (The reversible capacity remains 840 mAh/g after 500 cycles at 1 A/g), and excellent high rate capacity (The reversible capacity at 20 A/g remains 38.0% of that of first cycle at 0.1 A/g). The excellent electrochemical performance can be attributed to its unique morphology. The macropores of 3D porous copper substrate, mesopores of Co3O4nanosheets and open space between Co3O4nanosheets can provide lithium-ion rapid transport channels, Co3O4nanosheets directly grown on 3D porous copper substrate can provide electron rapid transport channels.