Patent ID: 8067119
Filing Date: 2011-11-29
Classification: H01M,Y02E

Abstract:
1. A non-aqueous electrolyte secondary battery comprising a positive electrode including an active material absorbing and desorbing lithium ions, a negative electrode including an active material absorbing and desorbing lithium ions, a separator interposed between said positive electrode and said negative electrode, and a non-aqueous electrolyte, wherein said separator includes a material containing a substituent group with electron-withdrawing property; said non-aqueous electrolyte includes a non-aqueous solvent and a solute dissolved therein, and said non-aqueous solvent includes: a first solvent of at least one selected from the group consisting of a fluorine-containing cyclic carbonic acid ester, and a fluorine-containing cyclic carboxylic acid ester; a second solvent of ethylene carbonate; and a third solvent of at least one selected from the group consisting of diethyl carbonate (DEC), ethyl methyl carbonate (EMC), and dimethyl carbonate (DMC), wherein the separator includes polytetrafluoroethylene (PTFE), and a content of said first solvent is 10 to 50 vol % of said non-aqueous solvent.