Patent ID: 7642015
Filing Date: 2010-01-05
Classification: H01M,Y02E,Y02P

Abstract:
1. A nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode including a carbonaceous material capable of intercalating and deintercalating lithium ions, and a nonaqueous electrolyte including a nonaqueous solvent, wherein the nonaqueous solvent contains cyclic carbonate including ethylene carbonate (EC) and propylene carbonate (PC), and sultone compound including a ring having at least one double bond, and the EC, PC and sultone compound are, wherein x (vol. %), y (vol. %), and z (vol. %) respectively, contained in the total volume of the nonaqueous solvent at the rate of 15≦x≦60, 35≦y≦85, and 0<z≦10.