“…The maximum power density is 14431 W kg −1 with the energy density of 202 Wh kg −1 , and the maximum energy density is 341 Wh kg −1 with the power density as high as 722 W kg −1 for HPC//HPC LIC. The obtained values are quite higher than some of the researches based on graphene, AC and some metal oxides, such as Fe 3 O 4 ‐graphene//AC, LiMnBO 3 //polyaniline nanofiber, low‐carbon silicon oxycarbide//AC, S‐doped graphene microspheres, TiO 2 //graphene, LiNi 0.5 Mn 1.5 O 4 //AC, Nb 2 O 5 ‐C//AC, graphene//graphene, TiO 2 reduced graphene//AC, Nb 2 O 5 @C//AC, as presented in the Ragone plots (Figure d). The capacitance loss is 5 % after the initial 500 cycles at 2 A g −1 during the cycle performance.…”