NOVELTY - A negative active material (10) comprises a silicon-based particle (11); and a crystalline carbonaceous material, where the crystalline carbonaceous material includes a graphite particle (12) and a carbonaceous nano-sheet (13).    USE - As negative active material in negative electrode of lithium battery (claimed), where the lithium secondary batteries are used in portable electronic devices for information communication, such as PDAs, mobile phones, notebook computers, and the like, electric bicycles, and electric vehicle. The lithium batteries include lithium ion batteries, lithium ion polymer batteries, and lithium polymer batteries of cylindrical type, a rectangular type, a coin type, or a pouch type, where the lithium batteries are also used as primary lithium batteries or secondary lithium batteries. The batteries are used as a power source for electric vehicles; in power source for general mobile phones and portable computers and can be coupled to existing internal combustion engines, fuel cells, or super-capacitors to be used in hybrid vehicles and in other applications requiring a high-power output, a high voltage, and high temperature operability.    ADVANTAGE - The lithium battery having the negative active material exhibits a discharge voltage that is at least twice that of general batteries. Thus lithium secondary batteries have a high energy density. The batteries containing the material exhibits high capacity, a high-power output, and high temperature operability. The material exhibits improved capacity and cycle lifetime characteristics.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a lithium battery, comprising: a negative electrode including the negative active material; a positive electrode facing the negative electrode and including a positive active material; and an electrolyte disposed between the negative electrode and the positive electrode.    DESCRIPTION OF DRAWING(S) - The figure shows schematic diagram showing a structure of a negative active material.    Negative active material (10)    Silicon-based particle (11)    Graphite particle (12)    Carbonaceous nano-sheet (13)    Substrate (20)