NOVELTY - The lithium secondary battery consists of positive electrode (1) and negative electrode (3), formed through an electrolyte. The positive electrode and negative electrode is capable of occluding and discharge lithium. The electrolyte is polyelectrolyte. The negative electrode contains a carbon material having an oxygen atom and a carbon atom. The ratio of concentration of oxygen atom and carbon atom is 0.035 or more.    USE - Lithium secondary battery is used for small portable apparatus such as notebook personal computer and mobile telephone.    ADVANTAGE - The lithium secondary battery has excellent charging/discharging cycle characteristics.    DETAILED DESCRIPTION - The lithium secondary battery consists of positive electrode and negative electrode, formed through an electrolyte. The positive electrode and negative electrode is capable of occluding and discharge lithium. The electrolyte is polyelectrolyte. The negative electrode contains a carbon material having an oxygen atom and a carbon atom. The ratio of concentration of oxygen atom and carbon atom is 0.035 or more. The carbon material is an amorphous carbon. The polyelectrolyte is lithium salt. The lithium secondary battery contains a nonaqueous solvent, a monomer having polymerizable functional group, and a polymerization initiator. The monomer is mixed with a polyfunctional monomer and a monofunctional monomer. The monomer contains at least one type of acryl monomer. The positive electrode contains lithium-manganese-nickel-oxide (Li1+~aMnxM1yM2z2O2, where M1 is cobalt and/or nickel, M2 is cobalt, nickel, aluminum, boron, iron, magnesium and/or chromium, x+y+z is 1, x is 0.2-0.6, y is 0.1-0.5, z is 0.05-0.5 and alpha is 0.01-0.3), preferably lithium-manganese-cobalt-oxide (Li1+~aMnxNiyCoz2O2, where x+y+z is 1, x is 0.2-0.6, y is 0.1-0.5, z is 0.05-0.5 and alpha is 0.01-0.3).    DESCRIPTION OF DRAWING(S) - The drawing shows a lamination structure of the lithium secondary battery.    Positive electrode (1)    Separator (2)    Negative electrode (3)    Aluminum lamination (4)