A Facile Way To Synthesize Carbon-Coated LiMn0.7Fe0.3PO4/Reduced Graphene Oxide Sandwich-Structured Composite for Lithium-Ion Batteries

We develop a facial and highly efficient way to synthesize carbon-coated LiMn0.7Fe0.3PO4 (LMFP)/reduced graphene oxide (rGO) sandwich-structured composite (LMFP/rGO@C), which is fabricated by the direct sonication of LMFP nanoparticles, graphite oxide, and carbon source together followed by heat treatment for the formation of carbon coating layer and the reduction of graphene. All the LMFP nanoparticles are found to prefer to anchor onto the top and bottom surfaces of exfoliated GO homogeneously, forming separately sandwiched structure without agglomeration. The prepared LMFP/rGO@C sandwich-structured composite exhibits an excellent rate capability (discharge capacity of similar to 90 mAh g(-1) at 30 C) and good cyclability (discharge capacity of 105 mAh g(-1) after 500 cycles), whereas simply carbon-coated LMFP only shows a discharge capacity of similar to 13 mAh g(-1) at 30 C and 91 mAh g(-1) after 500 cycles. This finding paves an efficient way to synthesize graphene-based composite with high performances for lithium-ion batteries.