Commercializable Fluorine‐Doped Porous Carbon Toward Advanced 4.5 V‐Class Lithium‐Ion Capacitors

Low specific capacitances and/or limited working potential (≤4.5 V). of the prevalent carbon‐based positive electrodes as the inborn bottleneck seriously hinder practical advancement of lithium‐ion capacitors. Thus, breakthroughs in enhancement of both specific capacitances and upper cutoff potentials are enormously significant for high‐energy density lithium‐ion capacitors. Herein, we first meticulously design and scalably fabricate a commercializable fluorine‐doped porous carbon material with competitive tap density, large active surface, appropriate aperture distribution, and promoted affinity with the electrolyte, rendering its abundant electroactive inter‐/surface and rapid transport. Theoretical calculations authenticate that fluorine‐doped porous carbon possesses lower adsorption energy and stronger interaction with . Thanks to the remarkable structural/compositional superiority, when served as a positive electrode toward lithium‐ion capacitors, the commercial‐level fluorine‐doped porous carbon showcases the record‐breaking electrochemical properties within a wider working window of 2.5–5.0 V (vs Li/Li + ) in terms of high‐rate specific capacitances and long‐duration stability, much superior to commercial activated carbon. More significantly, the 4.5 V‐class graphite//fluorine‐doped porous carbon lithium‐ion capacitors are first constructed and manifest competitive electrochemical behaviors with long‐cycle life, modest polarization, and large energy density. Our work provides a commendable positive paradigm and contributes a major step forward in next‐generation lithium‐ion capacitors and even other high‐energy density metal‐ion capacitors.