▎ 摘　　要

NOVELTY - Preparing graphene-coated modified ternary precursor comprises (a) dispersing unmodified ternary precursor material in water, adding ammonium persulfate and/or polydiallyldimethyl ammonium chloride, and reacting to obtain modified ternary precursor material, and (b) washing, then centrifuging the modified ternary precursor material, dispersing in water, adding graphene oxide, stirring, evaporating and crystallizing. USE - The ternary precursor is useful for improving electrochemical performance of the lithium battery. ADVANTAGE - The ternary precursor: has uniform coating and has high stability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for ternary material comprising graphene-coated modified ternary precursor, which is uniformly mixed with a lithium source, and is obtained after calcining.