▎ 摘　　要

NOVELTY - Carbon composite material comprises has a three-dimensional structure, and the size of at least one dimension is nano level, comprising a carbon nano tube graphene and carbon quantum dots, any one of the carbon nanotubes, graphene and carbon quantum dots is at least connected to the remaining two by chemical bonds. USE - Carbon composite material used as the conductive additive of the secondary battery (claimed). ADVANTAGE - The carbon composite material has good flexibility and high conductivity, as the conductive additive of the secondary battery, it can effectively improve the cycle performance of the secondary battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing carbon composite material, which involves taking the first electrode as the positive electrode in the electrolyte, so that the first electrode undergoes an electrochemical reaction and is dissolved in the electrolyte to obtain a mixed slurry, the electrolyte contains carbon quantum dots, and the carbon quantum dots carry oxygen-containing functional group and nitrogen-containing functional group, first electrode comprises a carbon nanotube and a first carbon material, the first carbon material comprises at least one of the oxidized graphene, expanded graphite, filtering and drying the mixed slurry to obtain a first material, performing in-situ reduction to the first material under the condition of non-reaction atmosphere to obtain the carbon composite material. DESCRIPTION OF DRAWING(S) - The drawing shows a three-dimensional modeling structure schematic diagram of the carbon composite material. (Drawing includes non-English language text).