Effect of Adding Activated Carbon of Different Proportions to the Positive Active Substance of Lithium Cobaltate LiCoO2 on the Performance of Hybrid Supercapacitors
Hybrid supercapacitors(HSCs)have attracted much attention because they combine the high energy density of lithium-ion batteries with the high-power characteristics of double-layer capacitors.In this work,LCO+AC//AC HSCs were prepared with lithium cobaltate(LiCoO2,LCO)and activated carbon(AC)of different proportions as composite positive electrode,and AC as negative electrode.The effects of different amounts of positive AC(3％,5％,8％)on the conductivity,compaction density and electrochemical performance of LCO+AC//AC hybrid superdifferent amounts of positive electrode were studied.The results show that with the increase of positive electrode AC,the thickness of the electrode plate increases,the compaction density decreases,the electrode resistance and resistivity increase,and the conductivity decreases.The Coulomb efficiency(ICE)decreased,the specific capacity and energy density decreased,and Ac internal resistance(Rac)increased with the increase of positive Ac.In the three compound positive electrode formulations,when the AC addition is increased to 5％,the measured maximum specific power is the highest,when the AC addition is increased to 8％,the cycle performance is favorable,the increase of AC will reduce the battery capacity,but will improve the cycle performance.
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