▎ 摘　　要

NOVELTY - Cathode material comprises sulfonated graphene, nano silicon oxide and lithium compound. The molar ratio of silicon element and sulfur element is 1:1-16:1. The molar ratio of lithium element and sulfur element is 1:1-1:5. The particle diameter of nano silicon oxide is 3-500 nm. The sulfonated graphene radial dimension is 0.05-100 mu m and thickness is 0.5-20 nm. The sulfonated graphene carbon element to sulfur element molar ratio is 12:1-3:1. USE - Cathode material used for physics and/or chemistry energy storage device including lithium ion battery (claimed). ADVANTAGE - The product has high specific discharge capacity, excellent coulomb efficiency, and excellent cycling performance. The method is simple, easy to operate, and suitable for large-scale production, and has low cost and good controllability. DETAILED DESCRIPTION - Cathode material comprises sulfonated graphene, nano silicon oxide (SiOx) and lithium compound. The molar ratio of silicon element and sulfur element is 1:1-16:1. The molar ratio of lithium element and sulfur element is 1:1-1:5. The particle diameter of nano silicon oxide is 3-500 nm. The sulfonated graphene radial dimension is 0.05-100 mu m and thickness is 0.5-20 nm. The sulfonated graphene carbon element to sulfur element molar ratio is 12:1-3:1. x=0-1. An INDEPENDENT CLAIM is included for preparation of cathode material comprising mixing sulfonated graphene aminosilane and orthosilicate in water phase system, reacting to obtain graphene-nano SiOx precursor solution; adding lithium compound under inert atmosphere, reacting at room temperature to obtaining lithium-rich precursor solution; removing water from lithium-rich precursor solution, and high temperature sintering under inert atmosphere.