Journal
RSC ADVANCES
Volume 4, Issue 20, Pages 10196-10203Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra46980h
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Funding
- National Natural Science Foundation
- China Academy of Engineering Physics United Found (NSAF) [11076003]
- National 863 Program of China [2013AA050903]
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An electrolyte (LiPF6-EC/PC/DEC) containing a lithium carbonate (Li2CO3) additive is used to enable the high cycling stability of a lithium cobalt oxide (LiCoO2) cathode which is charged to 4.5 V for a higher capacity. A capacity as high as 162.8 mA h g(-1) (1 C) is maintained after 116 cycles, which is twice as high as the capacity of 88.5 mA h g(-1) which was achieved in the Li2CO3 free instance. The interface properties of the electrode are investigated by cyclic voltammetry, electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy. It is found that the solid electrolyte interphase (SEI) film tends to be thin and steady, and that the electrolyte decomposition is suppressed with the addition of Li2CO3. A possible mechanism is proposed according to the DFT calculation. The results indicate that the Co4+center dot center dot center dot CO32- coordination may decrease the oxidizability of Co4+ on the electrode surface so that the electrolyte decomposition could be suppressed.
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