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Following the successful utilization of LiFePO4 as a novel cathode materialfor rechargeable lithium batteries, interest and efforts have grown in theresearch of another olivine structured material LiMnPO4 due to its higheroperating potential voltage and energy density. However, high rate performancefor LiMnPO4-based cathode materials has been challenging due to its extremelylow electrical and ionic conductivities. Here, we develop a synthesis ofFe-doped LiMnPO4 (LiMn0.75Fe0.25PO4) nanorods directly bonded on graphenesheets (reduced from graphene oxide) to render LiMn0.75Fe0.25PO4 nanorodssuperior electrical conductivity. The LiMn0.75Fe0.25PO4 nanorod morphology isunique to materials grown on graphene over those grown in free solution, and isideal for fast Li+ diffusion with the diffusion path of [010] crystallographicaxis along the short radial direction (~20-30nm) of the nanorods. Thesetogether lead to ultrafast discharge within ~30-40 seconds without using a highcarbon content. With high columbic efficiency above 99.5% at a high operatingvoltage, our LiMn0.75Fe0.25PO4 nanorods/graphene hybrid exhibits the best rateperformance among all doped LiMnPO4 cathode materials for Lithium ionbatteries.

LiMn1-xFexPO4 Nanorods Grown on Graphene Sheets for Ultra-High Rate Performance Lithium Ion Batteries