▎ 摘　　要

NOVELTY - Double-coated positive electrode material comprises a lithium iron phosphate substrate. The surface of the basal body is covered with a carbon coating layer and a vulcanized polyacrylonitrile layer from inside to outside sequentially in the vulcanized polyacrylonitrile layer. The mass ratio of the sulfur element to the polyacrylonitrile is 1 to 4: 1. Based on the whole positive electrode material, the content of the carbon coating layer is 0.5-2wt.%, the content of the polyacrylonitrile is 0.1-2wt.%. USE - Double-coated positive electrode material. ADVANTAGE - The double-coated positive electrode material has low cost, fast charging performance and structure stability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing double-coated positive electrode material, which involves dissolving soluble ferrous salt in water, heating and stirring to obtain the first solution, in the first solution, adding phosphorus source, keeping the pH value to be 1-4, heating and stirring, filtering and washing to obtain the first precursor, adding lithium source, additive, carbon source and water, ball milling, sand grinding, spraying to obtain the first mixed material, calcining the first mixed material in inert gas atmosphere, and then obtaining the first material by airflow crushing, dispersing the first material, sulfur powder, polyacrylonitrile in the solvent, ball milling and stirring, spraying to obtain the second mixed material, calcining the second mixed material under the inert gas atmosphere to obtain the double-coated material positive electrode.