Kang Wenpei, Tang Yongbing, Li Wenyue, Li Zhangpeng, Yang Xia, Xu Jun, Lee Chun-Sing
Department of Physics and Materials Science and Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, People's Republic of China.
Nanoscale. 2014 Jun 21;6(12):6551-6. doi: 10.1039/c4nr00446a.
A composite of porous CuCo2O4 nanocubes well wrapped by reduced graphene oxide (rGO) sheets has been synthesized by a facile microwave-assisted solvothermal reaction and applied as anode in lithium ion batteries (LIBs). The porous structure of the CuCo2O4 nanocubes not only provides a high surface area for contact with the electrolyte, but also assists by accommodating volume change upon charging-discharging. Impedance measurements and transmission electron microscopy show that incorporation of rGO further decreases the charge transfer resistance and improves the structural stability of the composite. As an anode material for a LIB, the composite exhibits a high stable capacity of ∼ 570 mA h g(-1) at a current density of 1000 mA g(-1) after 350 cycles. With a high specific surface area and a low charge transfer resistance, the composite anode shows impressive performance especially at high current density. The LIB shows a high capacity of ∼ 450 mA h g(-1) even at a high current density of 5000 mA g(-1), demonstrating the composite's potential for applications in LIBs with long cycling life and high power density.
通过简便的微波辅助溶剂热反应合成了一种由还原氧化石墨烯（rGO）片很好包裹的多孔CuCo2O4纳米立方体复合材料，并将其用作锂离子电池（LIBs）的阳极。CuCo2O4纳米立方体的多孔结构不仅为与电解质接触提供了高表面积，还通过容纳充放电时的体积变化起到辅助作用。阻抗测量和透射电子显微镜表明，rGO的掺入进一步降低了电荷转移电阻并提高了复合材料的结构稳定性。作为LIB的阳极材料，该复合材料在1000 mA g(-1)的电流密度下经过350次循环后表现出约570 mA h g(-1)的高稳定容量。由于具有高比表面积和低电荷转移电阻，复合阳极尤其在高电流密度下表现出令人印象深刻的性能。该LIB即使在5000 mA g(-1)的高电流密度下也显示出约450 mA h g(-1)的高容量，证明了该复合材料在具有长循环寿命和高功率密度的LIBs中的应用潜力。
