ENHANCEMENT OF Li–ION BATTERY CAPACITY USING NICKEL DOPED LiFePO4 AS CATHODE MATERIAL

La Thi Hang

Abstract


Selective supervalent cations (M = Ni, Mn, La etc.) doped LiFePO4 (LFP) is an effective route to enhance its electrical conductivity, thereby improving electrochemical performances of lithiumion batteries. For this purpose, nickel doped LiFePO4 based cathode material was investigated at different substitution amounts (xNi = 0.05, 0.10). LiFe1xNixPO4 (LFNP) was synthesized from Ni(NO3)2.6H2O, LiOH.H2O, FeSO4.7H2O, H3PO4, and ascorbic acid precursors via solvothermal technique, followed by calcination in nitrogen atmosphere at 550 °C for 5 h. The structure and morphology of synthesized materials were examined by Xray diffraction, Scanning electronic microscopy and Raman vibrational microspectroscopy. The electrochemical performances of doped materials were studied in Swageloktype cell using LiPF6/ECDMC (1:1) as electrolyte. LiFe1xNixPO4 was shown to exhibit homogenous particles size of 50 ¸ 150 nm. The doped materials were titrated to quantify iron and nickel contents in samples. As anticipated, the electrochemical performances of LiFe1xNixPO4were significantly enhanced compared to those of undoped LiFePO4.


Keywords


LiFe1–xNixPO4 (LFNP), solvothermal, lithium–ion, conductivity, capacity.

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DOI: https://doi.org/10.15625/2525-2518/55/1B/12119 Display counter: Abstract : 149 views. PDF : 88 views.

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Published by Vietnam Academy of Science and Technology