Patent ID: 8748036
Filing Date: 2014-06-10
Classification: H01M,Y02E,Y02P

Abstract:
1. A non-aqueous secondary battery comprising: a positive electrode; a negative electrode; a non-aqueous electrolyte; and a separator, wherein the positive electrode comprises a positive electrode mixture layer that includes a positive electrode active material, the positive electrode mixture layer has a thickness of 70 to 300 μm per one side, the negative electrode comprises a negative electrode mixture layer that includes a negative electrode active material and a binder, the negative electrode mixture layer has a density of 1.4 g/cm the negative electrode active material includes a first active material, a second active material, and a third active material, D50 of the first active material is 15 μm to 20 μm, the first active material is a carbon material having a D/G ratio of 0.15 or less, where G represents a peak intensity observed in a Raman spectrum from 1578 to 1592 cm D50 of the second active material is 10 μm or less, the second active material includes at least one of a first carbon material having the D/G ratio of 0.2 to 2.0 and a second carbon material having the D/G ratio of 1.0 to 2.0, D50 of the third active material is 5 μm or less, the third active material contains silicon and oxygen as constituent elements, a content of the first active material is 10 wt % to 57 wt % of a total weight of the negative electrode active material, a content of the third active material is 1 wt % to 10 wt % of the total weight of the negative electrode active material, and when the second active material includes the second carbon material, a content of the second carbon material is 40 wt % or less of the total weight of the negative electrode active material.