Preparation of Cu2O–Cu anode for high performance Li-ion battery via an electrochemical corrosion method
Preparation of Cu2O–Cu anode for high performance Li-ion battery via an electrochemical corrosion method
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DOI：
10.1016/j.electacta.2013.07.088
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发表时间：
2013-10
影响因子：
6.6
通讯作者：
Shibing Ni;Xiaohu Lv;Tao Li;Xuelin Yang;Lulu Zhang
中科院分区：
文献类型：
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作者：
Shibing Ni;Xiaohu Lv;Tao Li;Xuelin Yang;Lulu Zhang
采用电化学腐蚀法，在H2 O2的辅助下，在泡沫铜表面直接生长Cu 2 O。恒流电池测试表明，Cu 2 O-Cu电极具有优异的循环稳定性和倍率性能。在0.15 C的充放电速率下，充放电容量约为0.76 mA h cm− 2，在100次循环中无衰减。在0.2 - 35 C的不同速率下测试60次循环后，当充电/放电速率降低到0.2 C时，第5次循环放电容量可恢复98.9%。这是由于泡沫铜与CuO之间良好的电接触和多孔结构的Cu_2O电极。采用循环伏安法研究了Cu 2 O-Cu电极在不同扫描速率下的电化学反应动力学，结果表明，在0.1 ~ 3 mV s-1范围内，阳极和阴极峰电流与扫描速率的平方根呈线性关系，表明充放电过程中锂离子的扩散控制机制。
Cu2O was directly grown on Cu foam via a facile electrochemical corrosion method by the aid of H2O2. Galvanostatic battery testing shows that the Cu2O–Cu electrode exhibits excellent cycle stability and rate capability. It delivers charge and discharge capacity about 0.76 mA h cm−2without attenuation over 100 cycles under a charge/discharge rate of 0.15 C. After testing at various rates from 0.2 to 35 C over 60 cycles, the 5th-cycle discharge capacity can resume 98.9% when lowering the charge/discharge rate to 0.2 C. The performances are due to both the fine electric contact between Cu2O and Cu foam and a possible porous architecture of Cu2O electrode. The electrochemical reaction kinetic of Cu2O–Cu electrode was studied by cyclic voltammetry measurement at various scan rate, which indicates the anodic and cathodic peak currents show linear dependence on the square root of scan rate from 0.1 to 3 mV s−1, suggesting a lithium ion diffusion controlled mechanism in the charge/discharge process.