Polymer Cross‐Linking on Highly Continuous Carbon for High‐power Supercapacitor

Abstract

AbstractSupercapacitor with high power density (≈5 KW kg−1) is applied as power type energy storage device for high power load equipment. However, special super‐high‐power equipment cries for super‐high‐power supercapacitor (>20 KW kg−1), which is mainly ascribed to the high conductivity for electron‐transferring and the excellent structural stability for ion‐transporting of electrode materials. Herein, a continuous skeleton carbon (CSC) is built by introducing the gel network‐structured Polyvinylidene fluoride (PVDF) into the naturally rich biomass apocynum precursor. Benefiting from the high conductivity (5.79 × 103 S m−1) of CSC continuous skeleton, along with its high specific surface area (1461 m2 g−1) and hierarchically pore distribution, this skeleton‐structured CSC‐based symmetric supercapacitor can provide super‐high power density of 50 KW kg−1 at an energy density of 3.76 Wh kg−1 and keep ultra‐long life of 99.33%‐remaining after 10000 cycles in an aqueous electrolyte or provide higher energy density of 36 Wh kg−1 at an power density of 1.35 KW kg−1 in organic electrolyte. Evidently, this work may provide a continuous construction strategy of skeleton carbon at the complex multidimensional scale toward super‐high‐power supercapacitor and a hopeful solution to solve the extreme environment performance of special super‐high‐power equipment.