Nano-CuO coated LiCoO2: Synthesis, improved cycling stability and good performance at high rates
Nano-CuO coated LiCoO2: Synthesis, improved cycling stability and good performance at high rates
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DOI：
10.1016/j.electacta.2011.04.097
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发表时间：
2011-10
影响因子：
6.6
通讯作者：
Qin Hao;Houyi Ma;Zhicheng Ju;Guangda Li;Xiaowei Li;Liqiang Xu;Y. Qian
中科院分区：
文献类型：
--
作者：
Qin Hao;Houyi Ma;Zhicheng Ju;Guangda Li;Xiaowei Li;Liqiang Xu;Y. Qian
采用溶胶-凝胶法制备了LiCoO 2纳米粒子，并在其表面沉积适量的CuO纳米粒子以改善其循环性能。结果表明，CuO涂层样品在30 C以下的倍率下，10次循环后的容量保持率高于90%，在40 C和50 C下的最高容量分别为135和123 mAhg − 1（5480 mAg −1和6850 mAg −1）。循环伏安测试结果表明，CuO涂层降低了阴极的极化，提高了阴极的电化学活性。此外，实验结果表明，CuO涂层在降低电池在循环过程中的电荷转移电阻起着重要的作用，这已被证明由电化学阻抗谱分析。上述数据表明，CuO包覆LiCoO 2在高功率领域具有潜在的应用前景。
LiCoO2nanoparticles were prepared through a sol–gel method, and then appropriate amount of CuO nanoparticles were deposited onto their surfaces to improve their cycling performances. It is found that the CuO coated sample has the capacity retention higher than 90% at the rates below 30 C after 10 cycles, which also has the highest capacities of 135 and 123mAhg−1at 40 C (5480mAg−1) and 50 C (6850mAg−1), respectively. The cyclic voltammograms result reveals that the CuO coating reduces the polarization and improves the electrochemical activity of cathode. In addition, experimental results indicate that CuO coating plays an important role in reducing the charge transfer resistance of the cell during cycling, which has been demonstrated by the electrochemistry impedance spectroscopy analysis. The above data indicate the potential application of CuO coated LiCoO2in high power field.