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|1. (WO2014196656) METHOD FOR MANUFACTURING SECONDARY-BATTERY SEPARATOR AND METHOD FOR MANUFACTURING LITHIUM SECONDARY BATTERY|
|Applicants:||TOKYO METROPOLITAN UNIVERSITY
TOKYO OHKA KOGYO CO., LTD.
|Title:||METHOD FOR MANUFACTURING SECONDARY-BATTERY SEPARATOR AND METHOD FOR MANUFACTURING LITHIUM SECONDARY BATTERY|
Provided is a method for manufacturing, without using hydrofluoric acid, a secondary-battery separator that comprises a porous resin film in which air holes have a three-dimensional ordered array structure and are in mutual communication via through-holes. This manufacturing method involves the following: a microparticle dispersion slurry in which narrow-dispersion spherical microparticles are uniformly dispersed in a dispersion medium is prepared; the microparticle dispersion slurry is dried to obtain a narrow-dispersion spherical microparticle dispersion film; the film is heat-treated to form a microparticle-resin film in which microparticles are present in a three-dimensional ordered array in a resin matrix; and the microparticle-resin film is brought into contact with an inorganic acid or the like other than hydrofluoric acid to dissolve and remove the microparticles, or the microparticle-resin film is heated to remove the microparticles, to form air holes that are in mutual communication via through-holes and that have a three-dimensional ordered array structure in the resin matrix. The dispersion medium comprises a resin precursor that makes up the resin matrix, and the surface of the narrow-dispersion microparticles is inactive with respect to the dispersion medium.