Fe 3 O 4 Nanoparticles Enhanced Amorphous Ferric Silicate/Reduced Graphene Oxide for High‐Performance Lithium‐Ion Storage

Abstract Ferric silicate (FS) has been explored as a potential lithium ion batteries candidate for its environment benign, low cost, rich reserves, and high capacity. Despite these advantages, poor electronic conductivity and large volume variation obstruct its practical utilization. To improve its electrochemical performance, a unique hybrid structure with Fe 3 O 4 @ferric silicate nanosheets anchored on the reduced graphene oxide (FO@FS/RGO) is fabricated. The disordered amorphous nanosheet structure of FS not only shortens the transferred length for lithium ions but also facilities the Li + diffusion and can effectively keep the structure integrity. RGO substrate ameliorates the electronic conductivity and slackens the strain upon cycling. Fe 3 O 4 (FO) nanoparticles embedded in FS further boost the electronic conductivity and the lithium storage capability. The synergistic effects bestow the composite superior electrochemical properties. FO@FS/RGO shows high reversible capacity of 1113 mA h g −1 at 0.2 A g −1 , an excellent rate performance of 681 mA h g −1 at 2 A g −1 , and a splendid cycling stability with a capacity of 859 mA h g −1 at 1 A g −1 after 800 cycles.