| abstract |
The present invention addresses the problem of providing an inorganic oxide powder suitable for forming a porous inorganic oxide membrane having excellent lithium ion conductivity and having insulating properties, on at least one surface of a positive electrode, negative electrode, or separator configuring a lithium ion secondary battery. This invention pertains to an inorganic oxide powder used for forming a porous inorganic oxide membrane having insulating properties, on at least one surface of a positive electrode, negative electrode, or separator configuring a lithium ion secondary battery. The inorganic oxide powder has: 1) an oxide purity of at least 90 wt%; 2) an average particle diameter of no more than 1 µm; and 3) an average three-dimensional particle unevenness of at least 3.0. |