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-  2018 

Modifications and Electrochemical Properties of Graphite Fluoride

DOI: 10.13208/j.electrochem.180131

Keywords: 锂/氟化碳电池,氟化石墨,水合肼,改性,
lithium-fluorocarbon battery
,fluorinated graphite,hydrazine hydrate,modification

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摘要 本文以商用氟化石墨为原料,通过水合肼还原的方法对氟化石墨(CFx)进行改性处理,系统研究了不同水合肼用量对材料电化学性能的影响. 采用XRD、SEM、EDS、XPS、交流阻抗(EIS)和恒流放电测试技术,对改性氟化石墨材料的物相及电化学性能进行了分析研究. 结果表明,采用改性氟化石墨材料制备的锂/氟化碳(Li/CFx)电池的电压滞后现象得到明显改善,且不同水合肼用量对材料的电化学性能有重要影响. H-CFx-2(CFx:C2H6O:N2H4·H2O 的比例为1:2:1)材料的综合性能最佳,在0.1C 倍率下,材料的克比容量达到794.5 mAh·g-1,平台电压为2.53V,电压滞后现象的低波电压为2.37 V.
The commercial fluorinated graphite (CFx) was used as the raw material, which was modified by the reduction of hydrazine hydrate (N2H4·H2O). The effects of hydrazine hydrate contents on the electrochemical properties of fluorinated graphite were systematically studied. The crystal phases and electrochemical properties of the modified fluorinated graphite were analyzed by XRD, SEM, EDS, XPS, EIS techniques and constant current discharge measurement. The results showed that the voltage hysteresis response of Lithium-fluorocarbon battery prepared by the modified fluorinated graphite was obviously improved, while the amount of hydrazine hydrate had an important influence on the electrochemical performance of the materials. The H-CFx-2 material had the best overall performance (CFx:C2H6O: N2H4·H2O was 1:2:1). At 0.1C, the specific capacity of the material reached 794.5 mAh·g-1, the platform voltage was 2.53 V, and the low-wave voltage of the voltage hysteresis was 2.37 V


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