NOVELTY - A non-aqueous electrolyte secondary battery consists of a positive electrode, a negative electrode, and a non-aqueous electrolyte. The negative electrode consists of a mixed layer containing a carbon material. The carbon density computed by dividing the mass of carbon material in the mixed layer by the volume of mixed layer, is 1.55 g/cm3 or more. The carbon material contains a mixture of synthetic graphite particles and natural graphite particles. In the synthetic graphite particles, the face distance (d002) of (002) plane is 0.3354-0.3360 nm.    USE - Non-aqueous electrolyte secondary battery is used as power supply for electronic devices, such as personal computers, digital cameras, electric vehicles, and mobile telephones, and for electric power storage of high output.    ADVANTAGE - The non-aqueous electrolyte secondary battery has excellent load characteristics and cycle characteristics even in low-temperature environment.    DETAILED DESCRIPTION - A non-aqueous electrolyte secondary battery consists of a positive electrode containing an active material which can dope and de-dope lithium ion, a negative electrode containing an active material which can dope and de-dope lithium ion, and a non-aqueous electrolyte containing lithium salt. The negative electrode consists of a mixed layer containing a carbon material. The carbon density computed by dividing the mass of carbon material in the mixed layer by the volume of mixed layer, is 1.55 g/cm3 or more. The carbon material contains a mixture of synthetic graphite particles and natural graphite particles in a mass ratio of 50:50-80:20. In the synthetic graphite particles, the face distance (d002) of (002) plane in X-ray diffraction pattern is 0.3354-0.3360 nm, and the average aspect ratio is 1-5. In the natural graphite particles, the face distance (d002) is 0.3354-0.3357 nm, the median diameter (D50) is 10-25 mu m, and the ratio of 90% accumulated diameter with respect to D50 and ratio of D50 with respect to 10% accumulated diameter are 1.6 or less.