Synthesis of 0.4Li₂MnO₃?0.6LiNi_2/3Mn_1/3O₂/graphene Nano- Composite Materials with Cross-Linked Structure and Enhanced Rate Performance for Lithium-Ion Batteries

摘要

Nano 0.4Li2MnO3?0.6LiNi2/3Mn1/3O2/graphene composites have been synthesized by a facile sol-gelmethod and temperature programmed calcination route. The as-obtained products exhibited a nicemorphology which was nano-sized cross-linked structure. And it showed an excellent rate performancewhen it was used as cathode materials for lithium ion batteries. When it was at the current density of 2C, the discharge capacity could reach to 205 mAh g-1 for the first cycle and the capacity retentionstayed over 97 % after 100 cycles. The superior electrochemical behavior of0.4Li2MnO3?0.6LiNi2/3Mn1/3O2/graphene nanocomposite materials could be ascribed to the uniquenano-sized cross-linked structure, the maintaining of electrode integrity, the short diffusion distance,and continuously and rapidly electron conducting.