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Study on Properties of FeS2 Prepared by Hydrothermal Method

Author: CaiHuiSheng
Tutor: LiangGuangChuan
School: Hebei University of Technology
Course: Materials Physics and Chemistry
Keywords: Cathode material Hydrothermal method Iron disulfide Discharge performance Doped lithium
CLC: TM912.9
Type: Master's thesis
Year: 2010
Downloads: 89
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Abstract


This paper studies the desulfurization, acid treatment , lithium - doped hydrothermal synthesis of FeS 2 < / sub > of the structure , morphology and discharge performance impact . By differential thermal - thermal gravimetric analysis , XRD , SEM and so on its structure and morphology were characterized using constant current discharge tests to characterize their discharge performance . Focuses on the impact of of different desulfurization its discharge performance ; different concentrations of acid treatment after discharge performance changes ; doping LiOH · H 2 O its discharge plateau voltage depression . It was found that washing desulfurization and heat treatment desulfurization can be a good discharge performance of iron disulfide . In this paper, washing with chloroform and heat treatment method of iron disulfide desulfurization treatment . The results show that the sample obtained by the heat treatment method having a high open-circuit voltage reaches 2.67V, high as compared with the theoretical value , the battery discharge platform , the discharge capacity reaches 94.7% of the theoretical capacity . Relatively low open circuit voltage of the sample obtained by the chloroform washing discharge plateau voltage change , but with higher discharge capacity , reaching 886.5mAh / g , 99.6% of the theoretical specific capacity . Analyzed by XRD and SEM image analysis found that the decomposition of long-term storage of iron disulfide , block impurities , may be elemental sulfur and a small amount of iron oxide . Using sulfuric acid and hydrochloric acid treatment , the reduction of impurities and the discharge performance is significantly improved . The treatment with sulfuric acid of suitable concentration of 2.63mol / L, the discharge capacity after processing to achieve 763.4mAh / g, compared to untreated samples improves 121.4 mAh / g . The suitable concentration of 1.33 mol / L hydrochloric acid , after the discharge capacity of 784.0 mAh / g, compared with untreated samples improves 142.0 mAh / g . Doping LiOH? H 2 O and heat treatment can effectively improve the of iron disulfide discharge platform depression . Concentrations of LiOH by 1/3mol/L ? H 2 < / sub > O treated sample discharge capacity of 808.8 mAh / g depression voltage of 20mV, 290mV compared with untreated samples increased discharge platform . Lithium - doped sample after heat treatment at 450 ℃ depression voltage significantly reduced , and the discharge capacity of 859.3mAh / g , compared to before heat treatment increased 50.5 mAh / g .

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