Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 26, Issue 7, Pages 669-672Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/S1005-0302(10)60104-1
Keywords
Lithium-ion battery; Anode; Ca3Co4O9; K-doping
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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 (R-ct) and undergoes smaller R-ct change during cycling than the CCO sample, indicating improved electrochemical performance by K-doping.
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