Patent ID: 8163423

Claim:
A non-aqueous electrolyte battery, comprising: a non-aqueous electrolyte containing an electrolyte salt and a non-aqueous solvent, and a positive electrode and a negative electrode, wherein a main active material of said negative electrode is an active material that intercalates/deintercalates lithium ions at a potential not lower than 1.2 V relative to a potential of the lithium, an auxiliary active material of said negative electrode is a low temperature baked carbon material that at least intercalates the lithium ions at a potential lower than 1.2 V relative to the potential of the lithium and shows an interplanar spacing of a (002) plane of not less than 0.34 nm, a crystallite size Lc of not more than 100 nm as observed by wide-angle X-ray diffractometry, and a BET specific surface area of not more than 30 m 2 /g, and the lithium shows a spin-lattice relaxation time (T 1 ) of not less than 1 second as determined by a solid-state Li—NMR measurement in the main active material of said negative electrode by lowering the potential of the negative electrode to not higher than 0.3 V relative to the potential of the lithium at least once before operating the non-aqueous electrolyte battery.