Characterization of Inverse Spinel LiNiVO_4 Cathode Materials Prepared by the Sol-gel and Polymer Pr

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1 Results Due to the high cell voltage of LiNiVO4,the compound properties have been continuously studied as the potential cathode material for Li-ion batteries.LiNiVO4 cathode product has been known to exhibit high cell voltage of 4.8 V[1].LiCH3COO.2H2O (Sigma),Ni(CH3COO)2.4H2O (Aldrich) and NH4VO3(Ajax Finechem) were used as the starting reactants. In this work,LiNiVO4 was prepared by the sol gel method.This method was used to replace the conventional solid state reaction method in terms of the sample preparation as well as enhancing the conductivity of the composite material by adding citric acid[2].Citric acid behaves not only as a chelating reagent but also as a carbon source[3].The product was characterized using TGA and XRD.The TGA result shows that the minimum temperature to sinter the precursor was around 600 ℃.The initial weight loss was 3.61% before 100 ℃ due to the evaporation of water.The decomposition process stops at temperature above 600 ℃.The prepared powder was sintered at various temperatures ranging from 500 ℃ to 700 ℃ for 3 h.The mechanism for the synthesis of LiNiVO4 was determined by analyzing the TGA spectra.This work also includes the several suggested reaction steps involved in the preparation of LiNiVO4. 1 Results Due to the high cell voltage of LiNiVO4, the compound properties have been continuously studied as the potential cathode material for Li-ion batteries. LiNiVO4 cathode product has been known to exhibit high cell voltage of 4.8 V [1] .LiCH3COO.2H2O (Sigma), Ni (CH3COO) 2.4H2O (Aldrich) and NH4VO3 (Ajax Finechem) were used as the starting reactants. In this work, LiNiVO4 was prepared by the sol gel method. This method was used to replace the conventional solid state reaction method in terms of the sample preparation as well as enhancing the conductivity of the composite material by adding citric acid [2] .Citric acid behaves not only as a chelating reagent but also as a carbon source [3]. The product was characterized using TGA and XRD.The TGA result shows that the minimum temperature to sinter the precursor was around 600 ° C. The initial weight loss was 3.61% before 100 ° C. due to the evaporation of water.The decomposition process stops at temperature above 600 ° C. The prepared powder was sintered at various temperatures ranging from 500 ° C to 700 ° C for 3 h. The mechanism for the synthesis of LiNiVO4 was determined by analyzing the TGA spectra. This work also includes several suggested reaction steps involved in the preparation of LiNiVO4.
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