Alpha-ALUMINA, SLURRY, POROUS FILM, LAMINATED SEPARATOR, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY AND METHOD FOR PRODUCING SAME

• Main Authors: NASU TOMOMICHI, OZAKI HIROTAKA, SAKAMOTO SYUNSUKE
• Format: Patent
• Language: Chinese; English
• Published: 17.08.2021
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The purpose of the present invention is to provide alumina to be used in a slurry capable of suppressing irregularities on the surface of a porous film. The present invention is an alpha-alumina having a crystallite size of 95 nm or less and a lattice strain of 0.0020 or less determined by Rietveld refinement. The BET specific surface area of the alpha-alumina by the nitrogen adsorption method is preferably 10 m2/g or less. Also, the volume-based cumulative 50% equivalent particle size D50 of the alpha-alumina is preferably 2 [mu]m or less. 本发明的目的在于：提供用于能够抑制多孔膜的表面凹凸的浆料的氧化铝。本发明涉及α氧化铝，其由里德伯尔德求出的微晶尺寸为95nm以下，晶格应变为0.0020以下。上述α氧化铝的基于氮吸附法的BET比表面积优选为10m2/g以下。另外，上述α氧化铝的与体积基准的累积50％相当的粒径D50为2μm以下。