▎ 摘　　要

NOVELTY - Preparing high-capacity layered oxide cathode material comprises providing sodium source material comprising at least one of sodium carbonate, sodium bicarbonate, sodium hydroxide, sodium nitrate and sodium fluoride, providing M source material comprising at least one of carbonate, hydroxide, fluoride, nitrate and hydrate, and acetates and hydrates of M, hydrate cobalt source material comprising at least one of cobalt carbonate, cobalt hydroxide, cobalt nitrate, and cobalt oxide, configuring M source and cobalt source to obtain mixed precursor salt solution, slowly pouring the precursor salt solution into aqueous solution of citric acid to obtain a mixed salt solution, evaporating to dryness to obtain solid product, heating the dried solid product to burn the citric acid, heating to completely eliminate the organic matter in the precursor to obtain a powder, and ball milling to obtain semifinished powder, sintering and ball milling to obtain product. USE - The method is useful for preparing high-capacity layered oxide cathode material, which is useful in cathode sheet of the sodium ion battery (claimed). ADVANTAGE - The method synthesizes P2 phase layered oxide that is more stable relative to the O3 phase (octahedron), adopts cobalt to improve the structural stability of the layered oxide during charge and discharge, improves cycle stability of the high-voltage layered oxide, and prolongs cycle life. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for high-capacity layered oxide cathode material for sodium-ion batteries, has formula represented by P2-NayM1-xCoxO2(I). M = at least one of variable-valence metals nickel, manganese, iron, copper, vanadium, chromium, zirconium, and calcium; x = 0-0.3; and y = 0.6-0.8. Where x and y is mole percentages of the corresponding elements.