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We developed two-step solution-phase reactions to form hybrid materials ofMn3O4 nanoparticles on reduced graphene oxide (RGO) sheets for lithium ionbattery applications. Mn3O4 nanoparticles grown selectively on RGO sheets overfree particle growth in solution allowed for the electrically insulating Mn3O4nanoparticles wired up to a current collector through the underlying conductinggraphene network. The Mn3O4 nanoparticles formed on RGO show a high specificcapacity up to ~900mAh/g near its theoretical capacity with good ratecapability and cycling stability, owing to the intimate interactions betweenthe graphene substrates and the Mn3O4 nanoparticles grown atop. The Mn3O4/RGOhybrid could be a promising candidate material for high-capacity, low-cost, andenvironmentally friendly anode for lithium ion batteries. Ourgrowth-on-graphene approach should offer a new technique for design andsynthesis of battery electrodes based on highly insulating materials.

Mn3O4-Graphene Hybrid as a High Capacity Anode Material for Lithium Ion Batteries