Porous micro-spherical LiFePO4/graphene nanocomposites for high-performance Li ion battery cathode materials

摘要

In this work, we designed a novel cathode material, porous micro-spherical LiFePO4/graphene nanocomposites with low graphene content, via a hydrothermal route followed by a lithiation process. The nanocomposites consist of LiFePO4 microspheres (similar to 3 mm) with their primary particles (similar to 100 nm) sandwiched between layers of graphene nanosheets. Mesopores (similar to 25 nm) are widely present in the microspheres. TGA analysis indicates that only 2.65% graphene was loaded in the composites. When studied as a cathode material for Li-ion batteries, with the absence of a conductive agent, the nanocomposites can display a high capacity of 118.2 mA h g(-1) at 20 C.