Interface Engineering of Biomass‐Derived Carbon used as Ultrahigh‐Energy‐Density and Practical Mass‐Loading Supercapacitor Electrodes
Ruwei Chen, Hao Tang, Peng He, Wei Zhang, Yuhang Dai, Wei Zong, Fei Guo, Guanjie He, Xiaohui Wang
Abstract
Abstract The development of flexible electrodes with high mass loading and efficient electron/ion transport is of great significance but still remains the challenge of innovating suitable electrode structures for high energy density application. Herein, for the first time, lignosulfonate‐derived N/S‐co‐doped graphene‐like carbon is in situ formed within an interface engineered cellulose textile through a sacrificial template method. Both experimental and theoretical calculations disclose that the formed pomegranate‐like structure with continuous conductive pathways and porous characteristics allows sufficient ion/electron transport throughout the entire structures. As a result, the obtained flexible electrode delivers a remarkable integrated capacitance of 6534 mF cm −2 (335.1 F g −1 ) and a superior stability at an industrially applicable mass loading of 19.5 mg cm −2 . A pseudocapacitive cathode with ultrahigh capacitance of 7000 mF cm −2 can also be obtained based on the same electrode structure engineering. The as‐assembled asymmetric supercapacitor achieves a high areal capacitance of 3625 mF cm −2 , and a maximum energy density of 1.06 mWh cm −2 , outperforms most of other reported high‐loading supercapacitors. This synthesis method and structural engineering strategy can provide materials design concepts and a wide range of applications in the fields of energy storage beyond supercapacitors.