Patent ID: 9455091
Filing Date: 2016-09-27
CPC Classification: H01G,H01M,Y02E,Y02T

Claim Text:
1. An electric storage device having a positive electrode, a negative electrode, a separator located between the positive electrode and the negative electrode, and a nonaqueous electrolyte, wherein the positive electrode has a positive substrate layer, a positive composite layer containing a positive active material and an undercoat layer located between the positive substrate layer and the positive composite layer, a density of the positive composite layer is 2.1 g/cm the positive electrode has a rate of increase in sheet resistance after a solvent immersion test of 30% or less, and the undercoat layer contains a binder selected from the group consisting of chitosan derivatives, cellulose derivatives and acrylic acid derivatives; wherein the positive active material has a compound represented by Li