标题：Nano-CuO coated LiCoO_2: Synthesis, improved cycling stability and good performance at high rates
作者：Qin Hao;Houyi Ma;Zhicheng Ju;Guangda Li;Xiaowei Li;Liqiang Xu;Yitai Qian
作者机构：[Hao, Q] Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China;[ Ma, H] Key Laboratory of 更多
通讯作者地址：[Xu, LQ]Shandong Univ, Minist Educ, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China.
关键词：CuO coating;High voltage;High-rate performance;Lithium ion battery;Lithium cobalt oxide
摘要：LiCoO_2 nanoparticles 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 123mAh g~(-1) at 40 C (5480mA g~(-1)) and 50 C (6850 mA g~(-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 LiCoO_2 in high power field.