Synthesis and Property of F-doped LiNi0.7Mn0.3O2 Cobalt-free Nickel-rich Cathode Material for Li-ion Battery
LI Zhifeng, LUO Chuiyi, WANG Chunxiang, ZHONG Shengwen, ZHANG Qian
Jiangxi Key Laboratory of Power Battery and Material, School of Material Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000
Abstract: The F-doped LiNi0.7Mn0.3O2-xFx(x=0,0.01,0.02,0.03) cathode materials were synthesized by calcining the mixtures of LiOH·H2O,LiF and Ni0.7Mn0.3(OH)2 precursor formed through a simple continuous co-precipitation method. The effects of F doping on the crystal structure and electrochemical properties of LiNi0.7Mn0.3O2 were investigated systematically by X-ray diffraction (XRD),scanning electron microscope(SEM) and various electrochemical measurement. The XRD results showed that with the increasing F doping amount, the cell volume of the F-doped LiNi0.7Mn0.3O2 samples were slightly larger than that of pure LiNi0.7-Mn0.3O2, and F doping did not change the basic α-NaFeO2 layered structure. SEM results indicated F-doped samples showed slightly larger primary particle size and uniform morphology than pristine sample. X-ray photoelectron spectroscopy (XPS) test results showed that the content of divalent nickel in the material increased and the valence of other elements kept constant after F doping.Moreover, F-doping could improve the crystallinity of LiNi0.7Mn0.3O2.EIS and CV test revealed that the charge transfer resistance(Rct) and electrode polarization were reduced by F-doping. In spite of initial decreased discharge capacity, the columbic efficiency and cycle performance also improved.
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2018, Vol. 32 
