2.7V/1500F聚合物电容器制备与性能

Preparation and performance of 2.7V/1500F polymer supercapacitor

以中间相沥青为前驱体,以KOH和CO2为活化剂,采用物理—化学联合工艺制备了高比表面积的超级电容器用活性炭电极材料;以所制备的活性炭为电极材料制备了2.7V/1500F聚合物超大容量电容器,并对其充放电特性、容量、内阻、循环性能、漏电流、安全性能进行了测定。实验结果表明:所制备的活性炭为电极材料制成的碳基超级电容器,其充放电曲线表现出良好的电容特性,实际容量可达1 670F,活性物质的克容量为110.6F/g,电容器内阻在6mΩ以下;在大电流放电条件下,电容器的能量密度可达5.96 Wh/kg,5 000次循环后容量无明显的衰减现象。过充、短路、挤压和针刺四项安全测试测试结果良好。

With the mesophase pitch as precursor,KOH and CO2 as activated agents, the activated carbon electrode material was fabricated by physical-chemical combined activated technique for supercapacitor. 2.7 V /1500F supercapaeitor was prepared with the activated carbon as electrode materials. The charge and discharge behaviors, specific capacitance, equivalent serials resistance （ESR）, cycle properties and safy properties of prepared supercapacitor were all tested. The pre- pared supercapacitor with the activated carbon showed the desired capacitance properties. In the BF4 （CN）4/AN electrolyte, the specific capacitance and ESR of the prepared supercapacitor were 110.6 F/g and 6 mg~, respectively. The actual capacitance of supercapaeitor was 1600 F. Its en- ergy density could reach 5.96 Wh/kg at large discharge current . There was no obvious capaci- tance decay that could be observed after 5 000 cycles. After the safety examination, including o ver discharge, short circuit, extrusion and needle-punching tests, the supercapacitor showed de- sirable performance.