Electrochemical performance of LiCoO2 electrode prepared by dry method
Preparation process has an important influence on the performance of the electrode.Lithium cobalt oxide(LiCoO2)electrode is prepared by dry electrode process.The microscopic morphology,elemental distribution,electrical conductivity as well as the electrochemical performance of the dry electrodes are investigated by SEM,X-ray energy spectrometry,resistivity test,electrochemical impedance spectroscopy(EIS)and galvanostatic charge-discharge methods.In the dry electrodes,the fibrillated polytetrafluoroethylene(PTFE)is widely and uniformly distributed around the LiCoO2 active substance particles,forming a complete and dense three-dimensional network structure.Resistivity and EIS tests show that the dry electrode has better electrical conductivity.After 200 cycles at 1.0 C in 2.5-4.2 V,the dry electrodes deliver a capacity retention of 80.28%,which is better than 72.85%of the wet electrode.It indicates that the three-dimensional network structure formed by fibrous PTFE can improve the cycling stability of the battery and enhance the electrochemical performance.
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