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학술지 Preparation and Characterization of Chlorine Doped Li3V2(PO4)3 as High Rate Cathode Active Material for Lithium Secondary Batteries
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이솔닢, 김효상, 안재연, S. Amaresh, 이영기, 남경완, 이윤성
Journal of Nanoscience and Nanotechnology, v.14 no.10, pp.7516-7520
American Scientific Publishers (ASP)
Monoclinic Li3V2(PO4)2.99Cl0.01was synthesized using the conventional solid state method and the X-ray diffraction pattern was indexed based on P 21/n space group. The sharp cyclic voltammetric curves clearly revealed three lithium extraction/insertion processes at approximately 3.64, 3.72, 4.13, and 4.58 V during the anodic scan and 3.96, 3.58, and 3.48 V during the cathodic scan. Charge/discharge studies showed reduced electrolyte decomposition contribution in the case of the chlorine doped Li3V2(PO4)2.99Cl0.01sample with an initial capacity of 176 mA h g-1at a 0.1 C current rate. The chlorine doped Li3V2(PO4)3sample showed an increased capacity retention with an increase in current rate, even at a very high C-rate (20 C), than the pristine and carbon coated samples. The pristine and carbon coated Li3V2(PO4)3samples showed a lower capacity retention of 71% and 84%, respectively, at a current rate of 0.1 C. In contrast, the chlorine doped Li3V2(PO4)3sample retained 87% of the initial capacity (176 mA h g-1) at the same current rate but with a higher coulombic efficiency of 91%. The enhanced capacity retention for the chlorine doped Li3V2(PO4)3was attributed to the reduction in polarization and decreased charge transfer resistance of the electrode.
KSP 제안 키워드
48 V, Carbon coated, Charge/discharge studies, Coulombic Efficiency, Current rate, Cyclic voltammetric, Electrolyte decomposition, Enhanced capacity, High C-rate, High rate, Lithium extraction