▎ 摘　　要

NOVELTY - Silicon-oxygen composite cathode material comprises an inner core, a cladding layer and an intermediate layer is provided between the inner core and the cladding layer. The intermediate layer comprises a non-lithium silicate. The mass content distribution of the non-lithium silicate in the intermediate layer decreases from the intermediate layer to the inner core. The multiple pores are opened on the inner core and the intermediate layer and the pores extend from the surface of the intermediate layer toward the inner core. The pore diameter of the channel gradually decreases from the surface of the intermediate layer to the center of the inner core. USE - The silicon-oxygen composite cathode material is useful in lithium battery and terminal device (claimed). ADVANTAGE - The cathode material generates the non-lithium silicate in situ on the outer layer of the inner core with a dense structure that is non-aqueous-soluble, non-alkaline or weakly basic; alleviates the dissolution of internal aqueous-soluble lithium silicate and reduces the pH value. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for manufacturing silicon-oxygen composite cathode material comprising (a) mixing the silicon oxide and lithium source uniformly, transferring to a saggar, roasting in an inert atmosphere or a reducing atmosphere environment to obtain partially lithiated doped silicon oxide, performing pore-forming etching on the partially lithiated-doped silicon oxide to form a porous structure, obtaining partially lithiated-doped silicon oxide having a porous structure, (b) uniformly mixing the partially lithiated doped silicon oxide with a porous structure and a non-lithium metal or the partially lithiated doped silicon oxide with a porous structure and a non-lithium metal salt, roasting, performing in-situ generation of non-lithium silicate on the surface of the partially lithiated doped silicon oxide having a porous structure to obtain a lithium-doped silicon oxide composite material with a gradient distribution, (c) placing the lithium-doped silicon oxide composite material of the gradient distribution into an inert atmosphere furnace, feeding an organic carbon source gas, forming a carbonaceous coating layer on the surface of the lithium-doped silicon oxide composite material with gradient distribution to obtain a silicon-oxygen composite cathode material, where the silicon-oxygen composite cathode material comprises an inner core, a cladding layer, and an intermediate layer between the inner core and the cladding layer, the intermediate layer is non-lithium silicate including metal element M comprises aluminum, calcium, magnesium, beryllium, strontium, barium, titanium and/or zirconium, the mass content distribution of the non-lithium silicate in the middle layer decreases from the middle layer to the inner core, the intermediate layer further comprises silicon oxide SiOx, where x = 0.6-2, the x is the independent variable of the SiOx, the multiple pores are opened on the inner core and the intermediate layer and the pores extend from the surface of the middle layer to the direction of the inner core and the pore diameter of the channel gradually decreases from the surface of the intermediate layer to the center of the inner core.