▎ 摘　　要

NOVELTY - A modified particle comprises positive electrode material and electrolyte layer wrapped on surface of positive electrode material. The ionic conductivity of the electrolyte layer gradually increases from near positive electrode side to far positive electrode side of the electrolyte layer. The ion conductivity of the near positive electrode side of the electrolyte layer is 10-6-10-4S/cm2. The ion conductivity of the side far from the positive electrode of the electrolyte layer is 10-3-10-2S/cm2. USE - Modified particle used for all-solid-state lithium battery positive electrode (all claimed). ADVANTAGE - The method uses electrolyte layer which is uniform and has a gradient change in ion conductivity, increasing the contact area between the positive electrode material and solid electrolyte, and reducing the internal resistance of the positive electrode active material, can also reduce the degree of side reactions at the interface and improve the ion conductivity of the positive electrode, can greatly reduce the amount of electrolyte used, increase the proportion of active positive electrode materials, reduce the occurrence of side reactions, and improve the performance of the positive electrode. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: preparation of modified particle; and lithium battery positive electrode, which comprises positive electrode current collector and a positive electrode material layer coated on surface of the positive electrode current collector. The positive electrode material layer comprises a conductive agent, adhesive (A), and the modified positive electrode particles. The conductive agent is chosen from at least one of graphite, acetylene black, graphene, and carbon black. The adhesive (A) is fluorine-containing resin and/or polyolefin compound, preferably at least one of polyvinylidene fluoride, polytetrafluoroethylene, nitrile rubber and styrene-butadiene rubber; and all-solid-state lithium battery, which comprises a positive electrode, a negative electrode and a solid electrolyte layer.