Corresponding to the fully charged PBs, the neutral PBs with same polymerization and grafting density are introduced to show the significant effect of the direct Coulomb interactions, see the grey line in the left panel of Figure . We find that the height of charged PBs is larger than that of neutral ones, and more peaks are observed in the charged PBs. These behaviors indicate that electrostatic interactions prefer to promote the oscillation of PBs meanwhile prolong its height, which has a positive effect on the interfacial porous energy-storage layer. In addition, when the grafting density is small, the density of charged PBs at interface is smaller than that of neutral PBs.