Effect of K-doping on the Electrochemical Performance of Ca_3Co_4O_9 Anode for Li-ion Batteries  

作　　者：Jina Cao Hongquan Liu Jian Xie Caoshao Cao Xinbing Zhao 

机构地区：[1]Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

出　　处：《Journal of Materials Science & Technology》2010年第7期669-672,共4页材料科学技术（英文版）

摘　　要：Ca3CO4O9 （CCO） and Ca2.95K0.05Co4O9 （CKCO） powders have been prepared by the polyacrylamide gel method. CKCO shows increased capacity and better cycling stability compared with CCO. After cycled for 50 cycles at 0.5 C, CKCO retains a capacity of 223 mAh.g-1, almost twice than CCO. The electrochemical impedance spectroscopy （EIS） tests shows the CKCO sample has a lower initial charge transfer resistance （Rot） and undergoes smaller Rot change during cycling than the CCO sample, indicating improved electrochemical performance by K-doping.Ca3CO4O9 （CCO） and Ca2.95K0.05Co4O9 （CKCO） powders have been prepared by the polyacrylamide gel method. CKCO shows increased capacity and better cycling stability compared with CCO. After cycled for 50 cycles at 0.5 C, CKCO retains a capacity of 223 mAh.g-1, almost twice than CCO. The electrochemical impedance spectroscopy （EIS） tests shows the CKCO sample has a lower initial charge transfer resistance （Rot） and undergoes smaller Rot change during cycling than the CCO sample, indicating improved electrochemical performance by K-doping.

关 键 词：Lithium-ion battery ANODE CA3CO4O9 K-doping 

分 类 号：TG139.7[一般工业技术—材料科学与工程] TM912[金属学及工艺—合金]