摘要
制备变电站超级电容器的正极为活性炭,负极为预嵌锂石墨,通过恒流充放电、交流阻抗谱、循环伏安等方法对所制备电容器的电化学性能进行测试。通过与传统双电层电容器相比较可发现,制备的超级电容器所具备的电化学性能较好,其工作电压从2.2 V升至3.8 V,且能量为传统双电层电容器的3.58倍;当以200 m A/g的电流在2.0~3.8 V下循环2 000次时,其放电电容的保持率可高达97.8%。
The positive electrode of super capacitor prepared was the active carbon and the negative electrode wasthe pre embedded lithium graphite. The electrochemical performance of the capacitor was tested by the method ofconstant current charge discharge, AC impedance spectroscopy and cyclic voltammetry. By comparing with thetraditional electric double layer capacitor, the electrochemical performance of the super capacitor was better. Theoperating voltage from 2.2 V to 3.8 V, the energy of the super capacitor was 3.58 times of the traditional double layercapacitor. When the current in the 200 mA/g cycle2 000 times under 2.1～3.8 V, the retention rate of the supercapacitor discharge capacity could be as high as 97.8%.
出处
《电源技术》
CAS
CSCD
北大核心
2017年第9期1332-1334,共3页
Chinese Journal of Power Sources
基金
2015河南省教育厅自然科学研究重点项目(15B520010)
关键词
超级电容器
预嵌锂石墨
电化学性能
放电电容保持率
super capacitor
pre embedded lithium graphite
electrochemical performance
discharge capacityretention
