Patent ID: 8137846
Filing Date: 2012-03-20
Classification: H01M,Y02E,Y02P,Y02T

Abstract:
1. A nonaqueous-electrolyte secondary battery comprising a negative electrode and a positive electrode each capable of occluding/releasing lithium, a separator, and a nonaqueous electrolyte solution comprising a nonaqueous solvent and a lithium salt, wherein the separator comprises a porous film made of a thermoplastic resin containing an inorganic filler, and at least either of the following is satisfied: the active material contained in the negative electrode is a particulate active material having an aspect ratio of from 1.02 to 3; or the active material contained in the positive electrode is a particulate active material having an aspect ratio of from 1.02 to 1.5, and wherein the porous film of the separator is obtained by a process comprising: wherein the inorganic filler is at least one of barium sulfate and alumina and is present in the porous film in an amount of 100 parts by weight or more per 100 parts by weight of the thermoplastic resin, wherein when the electrolyte solution comprises a mixed nonaqueous solvent solution obtained by dissolving LiPF