Patent ID: 9466827
Filing Date: 2016-10-11
CPC Classification: H01M,Y02E,Y02P,Y02T

Claim Text:
1. A secondary battery, comprising an electrode assembly in which a positive electrode and a negative electrode are arranged to face each other, an electrolyte liquid, and a package accommodating the electrode assembly and the electrolyte liquid, wherein the negative electrode is formed by binding a negative electrode active substance containing a metal (a) capable of being alloyed with lithium, a metal oxide (b) capable of occluding and releasing lithium ions, and a carbon material (c) capable of occluding and releasing lithium ions, to a negative electrode current collector, with at least one negative electrode binder selected from polyimides and polyamideimides, wherein the electrolyte liquid comprises an acrylonitrile compound that is acrylonitrile or an acrylonitrile derivative, wherein the metal (a) is silicon and the metal oxide (b) is silicon oxide, wherein a content of each of the metal (a), the metal oxide (b) and the carbon material (c) with respect to a total content of the metal (a), the metal oxide (b) and the carbon material (c) is 20-50% by mass, 40-70% by mass and 2-20% by mass, respectively, wherein a content of the negative electrode binder with respect to a total content of the negative electrode active substance and the negative electrode binder is 1 to 30% by mass, and wherein a content of the acrylonitrile compound in the electrolyte liquid is 0.1 to 30% by mass.