Patent ID: 7651816
Filing Date: 2010-01-26
Classification: H01M,Y02E

Abstract:
1. A positive electrode active material for a non-aqueous electrolyte secondary battery comprising a lithium-containing composite oxide powder, wherein an absorption amount of a liquid reagent absorbed by said powder is 20 to 40 ml per 100 g of said powder when said liquid reagent is dibutyl phthalate (DBP), and an absorption amount of a liquid reagent absorbed by said powder is 20 to 50 ml per 100 g of said powder when said liquid reagent is N-methyl-2-pyrrolidone (NMP) or water, said absorption amount is a value measured using a device according to A test method or B test method regarding DBP absorption based on JIS K6217 (1997), said measured value is an amount of said liquid reagent added until the viscosity of a mixture of said powder and said liquid reagent reaches a level corresponding to 70% of maximum torque which is recorded when said powder is introduced into said device, and said liquid reagent is added dropwise thereto, during which a change in the viscosity of a mixture of said powder and said liquid reagent is measured by a torque detecting device, and wherein, said lithium-containing composite oxide powder is represented by a formula Li