▎ 摘　　要

NOVELTY - Lithium manganese iron phosphate material, is claimed. The lithium manganese iron phosphate material is a graphene-type two-dimensional structure. USE - Used as lithium manganese iron phosphate material. ADVANTAGE - The lithium manganese iron phosphate material has high conductivity, high compaction density, and stable electrochemical performance, and high efficiency and saves the production cost. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparation method of manganese phosphate iron phosphate material; and econdary battery.