▎ 摘　　要

NOVELTY - Electrode material for a lithium ion battery, comprises conductive active particles; and an ionic cover layer covering the conductive active particles. The ionic cover layer comprises a matrix of functional group-substituted polyaryletherketone and graphene particles dispersed in the matrix. USE - The electrode material is useful in electrode for lithium ion battery (claimed). ADVANTAGE - When used in lithium ion battery, the electrode material can alleviate the drawbacks of the prior arts, e.g. the capacity of the lithium ion battery may drop dramatically and the operating voltage may be significantly reduced during charging and discharging operations. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a method of preparing an electrode material for a lithium ion battery, which involves dissolving a functional group-substituted polyaryletherketone into a solvent to form a functional group-substituted polyaryletherketone solution; adding conductive active particles and graphene particles into the functional group-substituted polyaryletherketone solution to form a mixture slurry; and drying the mixture slurry to form the electrode material; and (2) an electrode for a lithium ion battery, comprising a substrate; and a layered structure formed on the substrate and including a conductive material and the electrode material.