Jina Cao Hongquan Liu Jian Xie Gaoshao Cao Xinbing Zhao
材料科学技术（英）
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 (Rct) and undergoes smaller Rct change during cycling than the CCO sample, indicating improved electrochemical performance by K-doping.
关键词:
Lithium-ion battery
,
Anode
,
Ca3Co4O9
,
K-doping
