LAUSR

Lithium-ion batteries (LIBs) with high energy density and safety under conditions are highly desirable for electric vehicles (EVs). However, the favorable growth of Li dendrites and increased temperature at high charging rates, as well as the low specific capacity of commercially available anodes, cannot meet the market demand. Herein, a facile one-pot electrochemical self-assembly approach is suggested for constructing hybrid electrodes composed of ultrafine Fe3O4 particles on reduced graphene oxide (Fe3O4@rGO) as anodes for LIBs. The rationally designed Fe3O4@rGO electrode containing 36 wt.% rGO exhibited an increased specific capacity as cycling progressed owing to improved active sites, electrochemical kinetics, and catalytic behavior, leading to a high specific capacity of 833 mAh g-1 and outstanding cycling stability over 2000 cycles with a capacity loss of only 0.127% per cycle at 5 A g-1, enabling the full charging of batteries within 12 min. Furthermore, the origin of abnormal improvement in the specific capacity, called negative fading, which exceeds the theoretical capacity is investigated. This study opens up new possibilities for the commercial feasibility of Fe3O4@rGO anodes in fast-charging LIBs.