Citation: ZHANG Bo, HE Jun, HUA Zheng-Shen, LU Haoqi, WANG Xin, PENG Hui-Fen. Effect of MoO42- Substitution on Electrochemical Properties of Nasicon Li3Fe2(PO4)3 Cathode[J]. Chinese Journal of Inorganic Chemistry, ;2016, 32(12): 2109-2116. doi: 10.11862/CJIC.2016.267
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MoO42- polyanion was tried to substitute for PO43- partially in the Li3Fe2(PO4)3 compound. The results proved that the introduced MoO42- anions mainly dissolved in the Li3Fe2(PO4)3 and the corresponding electrochemical properties were improved apparently. Among the MoO42- substituted materials, the sample with MoO42- content of 0.3 presented the excellent electrochemical properties. Its initial discharging capacity was 113.7 mAh·g-1 at a rate of 0.5C, which was about 20.7% higher than that without any MoO42-. The capacity retention was about 94% at a rate of 0.5C after 60 cycles. Moreover, this material could restore 95% of the initial capacity when the discharging rate was reset back to 0.5C even after higher cycling rate of 5C. The boost in electrochemical properties for the MoO42- substituted samples is ascribed to the synergistic effects of improved redox ability, decreased potential polarization and charge transfer resistance as well as increased diffusion coefficient of lithium ions.
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