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Study on Synthesis and Properties of FeS2 Cathode Material by Hydrothermal Method

Author: BuDongShuang
Tutor: LiangGuangChuan
School: Hebei University of Technology
Course: Materials Physics and Chemistry
Keywords: hydrothermal synthesis iron disulfide cathode material discharge performance preparation technics
CLC: TM912.9
Type: Master's thesis
Year: 2010
Downloads: 63
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Abstract


FeS2 cathode material for Li/FeS2 battery was synthesized by hydrothermal method using ferrous sulphate, ammonium thiosulfate and sulfur colloid as raw materials.The single-factor experiment was applied to obtain the preparation technics of FeS2, based on which the effect of different desulfurization methods on the properties of FeS2 was also investigated. The structure and morphology were characterized by XRD, SEM and laser particle size analyzer. And the discharge performance was analyzed by constant current-discharge test. The influence of pH value of initial reaction solution, molar concentration and reaction temperature on the synthesis process was discussed.The results showed that the sample prepared under alkaline conditions exhibited a lower discharge capacity of 694.8 mAh/g, while the pH value of initial reaction solution had little effect on the discharge performance of sample under acidic conditions, whose discharge capacity could all reach 800 mAh/g. When the reaction temperature was higher than 160℃, the temperature had no significant influence on the discharge capacity of sample. Moreover, the molar concentration of reactants had no obvious effect on the discharge capacity of sample. Based on all of these, the optimal synthesis conditions were obtained.The reaction time had little effect on the sulfur contents in the product. However, the molar ratio of reactants showed obvious influence on sulfur contents. And the sample with n（Fe2+）:n（S2O32-）:n（S）=1:1.2:0.5 had a lowest sulfur content of only 10.0wt%, and a specific discharge capacity of 856.5 mAh/g at 0.3C rate.The analysis showed that the as-prepared cubic FeS2 exhibited spherical morphology with rough surface and an average particle size of 12μm. The electrochemical results showed that the discharge capacity and voltage plateau both decreased with discharge current density increasing at room temperature. There is no obvious voltage depression at 0.1C rate, and the discharge capacity could reach 904.7 mAh/g, close to the theoretical capacity, while the specific capacity was only 758.2 mAh/g at 1C rate. The influence of different desulfurization methods on the electrochemical properties of samples was studied. It was found that the desulfurization methods had no obvious effect on the specific capacity of sample prepared at 160℃, which would reach 820 mAh/g. However, the desulfurization methods had significant influnence on the discharge capacity of the sample prepared at 180℃at 0.3C rate, and little effect on the capacity at 0.1C rate. The discharge capacity of samples after heat-treatment and organic solvent washing could reach 483.7 mAh/g and 824.8 mAh/g, respectively at 0.3C rate.The samples desulfurized by both methods exhibited a discharge capacity of 840 mAh/g at 0.1C rate.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery > A variety of materials, battery
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