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A new way of pre-doing Li+ into lithium ion hybrid capacitors was studied.In this way,preliminary Li+ intercalation MCMB was used as negative electrode in MCMB/AC capacitors (PI-LIHC).The results demonstrated that,the PI-LIHCs have good electrochemical performance.Gravimetric energy density of the capacitor increases from 33.69Wh/kg up to 103.63Wh/kg,and the efficiency increases from lower than 95% up to nearly 100%.