高电压氟化碳纳米球材料的制备及性能

Preparation and performance of high voltage fluorinated carbon nanosphere material

从结构设计上提升氟化碳(CF_(x))材料的导电性。通过简单水热法设计合成CF_(x)前驱体材料,再经高温氟化,制备高电压CF_(x)纳米球材料。用SEM和热重分析(TG)对CF_(x)纳米球材料的形貌和热稳定性进行分析,并用恒流放电、功率放电和电化学阻抗等对电化学性能进行测试。与商用CF_(x)材料相比,CF_(x)纳米球材料热稳定性提高了12.22%,且结合了金属氧化物的倍率性能和CF_(x)材料的容量特性,在功率输出测试时未出现明显的电压滞后现象,且放电时间延长了12.66%。随着导电性的提升,高电压CF_(x)纳米球电极具有更高的离子扩散系数(2.18×10^(-13)cm^(2)/s)。

The conductivity of fluorinated carbon(CF_(x)) materials was improved from material structure design.The CF_(x) precursor material was designed and synthesized by a simple hydrothermal method,then the high voltage CF_(x) nanosphere material was prepared by high temperature fluorination.The morphology and thermal stability of the CF_(x) nanosphere material were analyzed by SEM and thermogravimetric analysis(TG).The electrochemical performance was tested by galvanostatic discharge,power discharge and electrochemical impedance.Compared with commercial CF_(x) material,the thermal stability of CF_(x) nanosphere material was improved by 12.22%.Combined with the rate capability of metal oxide and the capacity characteristics of CF_(x) material,there was no obvious voltage delay phenomenon in the power output test,the discharge time was prolonged by 12.66%.With the improvement of the conductivity,the high voltage CF_(x) nanosphere electrode had higher ionic diffusion coefficient(2.18×10^(-13)cm^(2)/s).