制片压力对有机电解液双电层电容器性能的影响

Effect of compaction pressure on the performance of organic electrolyte electric double layer capacitor

通过扫描电镜对不同制片压力下极片的表观形貌进行观察,以及通过交流阻抗和恒流充放电,研究了不同制片压力对极片的比电容、等效串联电阻、功率特性和循环性能的影响.结果表明,在0～45MPa压力范围内随着制片压力的增大,极片的等效串联电阻先减小后增大,比电容先增大后减小,功率特性也是先变好后变差.当制片压力为35 MPa时,极片各种性能达到最佳:极片得到最小的等效串联电阻0.92Ω;在不同的电流密度下比电容均为最大,当电流密度为0.15A/g时,比电容达到118.3F/g;电流密度从0.15A/g增加到9.6A/g,其比电容仅衰减了4.5%,功率特性较佳.

The morphology of electrodes under different compaction pressures was observed by scanning e- lectron microscope. The specific capacitance, equivalent series resistance, power characteristic and cycle performance of electrodes under different compaction pressures were studied by AC impedance and con- stant current charge-discharge. The results show that the equivalent series resistance first decreases and then increases, specific capacitances first increases and then decreases, and power property first becomes better and then deteriorates along with the increase of compaction pressure in the range of 0-45 MPa pres- sure. All kinds of performance of electrode achieve the best when compaction pressure is 35 MPa. Elec- trode gets the minimum equivalent series resistance which is 0.92Ω. In different current density, specific capacitance are all the maximum, and the specific capacitance is 118.3 F/g when the current density is 0.15 A/g. Electrode＇s specific capacitance only decreases by 4. 5% when current density increases from 0.15 A/g to 9.6 A/g, and it＇s power characteristic is better.