The present invention provides a positive electrode compound for a lithium ion secondary battery capable of simply obtaining a lithium ion secondary battery with small internal resistance and excellent output features, cycle features and low-temperature features. The positive electrode compound comprises an active material capable of adsorbing and releasing lithium ions and a conductive agent. Theactive material is a lithium nickel manganese cobalt composite oxide, the agent is a carbon black and a carbon nano tube, the specific surface area of the BET of the carbon black is 100-250 m2/g, theabsorption amount of the DBP is 210-300ml/100g, and the average diameter of the carbon nano tube is 7-15nm.