Effect of activated carbon and electrolyte on properties of supercapacitor
(0) Effect of activated carbon and electrolyte on electrochemical properties of organic supercapacitor was investigated.The results show that specific surface area and mesoporosity of activated carbon influence specific capacitance.If specific surface area is larger and mesoporosity is higher,the specific capacitance will become bigger.Specific surface area influences resistance of carbon electrode and consequently influences power property and pore size distribution.If specific surface area is smaller and mesoporosity is higher,the power property will become better.Ash influences leakage current and electrochemical cycling stability.If ash content is lower,the performance will become better.The properties of supercapacitor highly depend on the electrolyte.The compatibility of electrolyte and activated carbon is a determining factor of supercapacitor’s working voltage.LiPF6/(EC+EMC+DMC) is inappropriate for double layer capacitor.MeEt3NPF4/PC has higher specific capacitance than Et4NPF4/PC because methyl’s electronegativity value is lower than ethyl and MeEt3N+ has more positive charges and stronger polarizability than Et4N+ when an ethyl is substituted by methyl.
activated carbon specific surface area mesoporosity ash electrolyte compatibility supercapacitor
ZHOU Shao-yun LI Xin-hai WANG Zhi-xing GUO Hua-jun PENG Wen-jie
School of Metallurgical Science and Engineering,Central South University,Changsha 410083,China
国际会议
2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)
长沙
英文
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）