关键词: 锂/氟化碳电池, 氟化石墨, 水合肼, 改性

Abstract:

The commercial fluorinated graphite (CF_x) 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-CF_x-2 material had the best overall performance (CF_x: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.

Key words: lithium-fluorocarbon battery, fluorinated graphite, hydrazine hydrate, modification