Patent ID: 9614221
Date: 2017-04-04
CPC Classifications: H01M,Y02E,Y02P

Claim:
1. A lithium-ion secondary battery comprising: a rectangular positive electrode; a rectangular negative electrode; and a separator, wherein the positive electrode, the negative electrode, and the separator constitute a laminated electrode group, the separator is coated on one or more sides with an inorganic filler containing at least SiO the positive electrode includes a positive electrode current collector foil, and a positive electrode mixture layer containing a positive electrode active material, the negative electrode includes a negative electrode current collector foil, and a negative electrode mixture layer containing a negative electrode active material, the negative electrode active material includes a silicon-based material, and a carbonaceous material, the negative electrode includes a binder comprising one or more of the following: polyamideimide, polyimide, polyamide, PVDF, or SBR, a mass ratio of the silicon-based material and the carbonaceous material is 20:80 to 69:31, the silicon-based material is a Si alloy or SiO the positive electrode and the negative electrode have a collection terminal protruding from a same side of the laminated electrode group, the negative electrode current collector foil is formed of any one of a stainless steel; a copper alloy containing copper with a purity of 99.9% or more and one or more kinds of elements selected from the group consisting of zirconium, silver and tin; and when comparisons are drawn between lengths of the positive electrode mixture layer and the negative electrode mixture layer in a direction where the collection terminal protrudes from the same side, the length of the positive electrode mixture layer is the length of the negative electrode mixture layer or longer.