氟化碳材料结构调控及其电化学性能构效关系研究

Structure design of fluorinated carbon and its structure-electrochemical performance relationships

氟化碳材料的形貌结构、颗粒尺寸和表面性质,对其电化学性能具有重要影响。制备了颗粒尺寸为50~200 nm类球形纳米氟化碳材料,材料的F/C原子比为1.3。结果表明,氟化碳材料的高F/C和纳米尺寸的颗粒结构,使得其与商品化氟化石墨材料相比具有更高的比容量和优良的倍率性能。该材料在0.1 C倍率放电比容量为985 mAh/g,1 C放电比容量为827 mAh/g。采用纳米碳层对制备的氟化碳进行表面包覆,提高了氟化碳材料的放电电压和比容量,包覆后的氟化碳材料1 C放电比容量861 mAh/g,放电电压提升0.3 V。

The morphology,structure,particle size and surface properties of fluorinated carbon material have important effects on their electrochemical properties.In this study,a spherical-like fluorinated carbon material with particle size of 50-200 nm was synthesized,and the F/C ratio of the material was 1.3.The results show that the high F/C and nanoscale particle structure of fluorinated carbon materials result in higher specific capacity and excellent rate performance compared to commercial fluorinated graphite materials.The discharge specific capacity of CF1.3 is 985 mAh/g at 0.1 C and 827 mAh/g at 1 C.The discharge voltage and specific capacity of the fluorinated carbon was further improved by surface nano-carbon coating technology.After coating,the discharge specific capacity is 861 mAh/g at 1 C,and the discharge voltage is increased by 0.3 V.