Patent ID: 9577237
Date: 2017-02-21
CPC Classifications: C01F,C01P,H01M,Y02E,Y02P

Claim:
1. An inorganic oxide powder for use in forming an inorganic oxide porous membrane having insulation performance on at least one surface of a positive electrode, a negative electrode and a separator which constitute a lithium ion secondary battery, characterized in that the powder has 1) an oxide purity of 90% by weight or higher, 2) an average particle diameter of 1 μm or less, 3) an average three-dimensional particle unevenness of 3.0 or higher, wherein the powder contains 5% or more of particles having a three-dimensional particle unevenness of higher than 4.0, based on the number of entire particles constituting the inorganic oxide powder; and wherein when 5% cumulative percentage and 100% cumulative percentage on a mass basis from the smaller side of a particle diameter distribution are d5 and d100, respectively, [(d100−d5)/average particle diameter] is 5 or less.