Kilogram‐Scale Production of Ultrafast‐Charging Micro‐Expanded Graphite Anode toward High‐Power and Long‐Life Ah‐Level Pouch Batteries

Abstract

Abstract The exponential growth of electric vehicle industry necessitates to rapidly develop fast‐charging technology for lithium‐ion batteries. However, the mainstream graphite anode encounters significant challenges in fast‐charging scenarios, including capacity decay and shortened lifespan caused by the sluggish lithiation kinetics and unstable solid electrolyte interphase. Herein, the kilogram‐level scalable production of ultrafast‐charging anode (C@MEG) consisting of micro‐expanded graphite coated by an ultrathin disordered carbon layer (5 nm) is reported, which simultaneously compensates for the conventional limitation of internal lithium diffusion kinetics and reconfigures the external electrode–electrolyte interface. This uniqueness endows rapid surface‐to‐bulk lithium transport, with minimized electrode polarization, enhanced pseudocapacitive behavior, and reduced interface impedance. At an ultrafast‐charging rate of 10 C, this Li||C@MEG cell exhibits an ultrahigh capacity of 157 mAh g −1 , superior to pristine graphite (71 mAh g −1 ) and previously reported graphite anodes. Moreover, this assembled 1 Ah‐level C@MEG||LiCoO 2 pouch battery delivers remarkable fast‐charging cyclability, showcasing 92% capacity retention after 1000 cycles under 3 A, together with high power density around 1500 W kg −1 under 10 A, corresponding to a short charging time of only 4.2 min, demonstrative of applicability. This work presents a practical scalable fast‐charging anode toward high‐energy, high‐power and long‐life batteries.