INORGANIC OXIDE POWDER AND INORGANIC OXIDE-CONTAINING SLURRY, AND LITHIUM ION SECONDARY BATTERY USING THE SAME SLURRY AND METHOD OF PRODUCING THE SAME

摘要

An inorganic oxide powder suited to form an inorganic oxide porous film having insulating properties on a surface of at least one of a positive electrode, a negative electrode and a separator which are used configure a lithium ion secondary battery is provided. Disclosed is an inorganic oxide powder used to form an inorganic oxide porous film having insulating properties on a surface of at least one of a positive electrode, a negative electrode and a separator used in a lithium ion secondary battery, wherein (1) oxide purity is 90% by weight or more, (2) the content of coarse particles having a particle diameter of 10μm or more is 10 ppm or less in terms of a mass ratio, and (3) porosity of a green formed body of the inorganic oxide powder prepared under a pressure within a range of 29 MPa or more and 147 MPa or less is 40% by volume or more and 80% by volume or less, an average pore diameter of the green formed body is 0.06μm or more, and an amount of a change in porosity per pressure of 1 MPa at the time of molding of the green formed body is 0.020% or more and 0.060% or less.