Lithium iron phosphate nanorod/graphene composite material as well as preparation method and application thereof

The invention discloses a lithium iron phosphate nanorod/graphene composite material as well as a preparation method and an application thereof; the preparation method comprises the following steps offirstly, providing ferrous oxalate/graphene oxide composite material and then carrying out mixing on the ferrous oxalate/graphene oxide composite material and ammonium dihydrogen phosphate and lithium acetate dihydrate according to a certain molar ratio, and carrying out grinding and drying, and next, carrying out high-temperature reaction under the protection of inert gas to obtain the compositematerial. The lithium iron phosphate nanorod/graphene composite material prepared by adopting a two-step solid phase reaction method is small in particle size and uniform in particle size distribution, and has a one-dimensional nanorod-shaped structure, so that the transmission rate of ions can be effectively increased, and the capacity in large-current discharge is not attenuated; graphene is added, so that the surface c