Effect of K-doping on the Electrochemical Performance of Ca(3)Co(4)O(9) Anode for Li-ion Batteries

Ca(3)Co(4)O(9)(CCO) and Ca(2.95)K(0.05)Co(4)O(9) (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. Th...

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Bibliographic Details
Published in:Journal of materials science & technology 2010-07, Vol.26 (7), p.669-672
Main Authors: Cao, Jina, Liu, Hongquan, Xie, Man, Cao, Gaoshao, Zhao, Xinbing
Format: Article
Language:English
Subjects:
Anode effect
Batteries
Charge transfer
Cycles
Electrochemical impedance spectroscopy
Performance enhancement
Polyacrylamides
Stability
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Summary:Ca(3)Co(4)O(9)(CCO) and Ca(2.95)K(0.05)Co(4)O(9) (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.
ISSN:1005-0302