Tokyo Metropolitan University

Tokyo Ohka Kogyo Co., Ltd.

3dom Inc.

Hirokazu Munakata

Kiyoshi Kanamura

Takahiro Asai

Hiroyoshi Sago

Kazuhiro Imazawa

Takashi Ono

Koichi Misumi

Masahiro Suzuki

Yongcheng Jin

Provided is a lithium secondary battery separator including a laminate of a substrate and a porous heat-resistant polyimide film which covers at least one surface of the substrate. The porous heat-resistant polyimide film has pores which are regularly arrayed three-dimensionally and a film thickness of 5-20 &#x3bc;m. Penetration damage to the separator by growth of dendrite-shaped lithium is avoided, and it is also possible to meet a request which is demanded of the lithium secondary battery separator.

Lithium secondary battery separator and method of manufacturing same

Provided is a separator which can make the electric field on the surface of a negative electrode for a metal secondary battery homogeneous to thereby prevent the formation of dendrites. A porous separator for metal secondary batteries, which has a polymer electrolyte layer formed on the surface layer of at least one main surface of a porous polyimide film. It is preferred that the polymer electrolyte layer is composed of both a polymer electrolyte material which is supported on at least one main surface of the porous polyimide film and a polymer electrolyte material which is supported in voids in a layered region that extends from the main surface.

Separator for metal secondary batteries

A method for manufacturing, a secondary battery separator including a porous resin film in which pores have three-dimensionally ordered structure and are in mutual communication via through-holes. The method includes: uniformly dispersing spherical microparticles having narrow particle size distribution in a dispersion medium to prepare a microparticles-dispersed slurry; drying slurry to obtain a spherical microparticles-dispersed film; heat-treating the film to form a microparticles-resin film in which the microparticles are regularly arrayed in three-dimensions in a resin matrix; and contacting the microparticles-resin film with an organic acid, water, an alkaline solution or an inorganic acid other than hydrofluoric acid to dissolve and remove the microparticles, or heating the microparticles-resin film to remove the microparticles, to form pores which are in mutual communication and regularly arrayed in the resin matrix. The medium has a resin precursor for the resin matrix and surfaces of the microparticles are inactive against the medium.

Method for manufacturing secondary battery separator and method for manufacturing lithium secondary battery

An electrode having excellent charge/discharge cycle characteristics and which is capable of improving a secondary battery capacity. An electrode is formed on the surface of a collector as an assembly of multiple porous domain structures that are apart from each other, the porous domain structures each having a polygonal shape without an acute angle in a planar view, the polygonal shape having a maximum diameter of 120 &#x3bc;m or less.

Secondary battery porous electrode

To provide a method for producing a comb-shaped electrode capable of precisely carrying a large amount of active materials on a surface of current collectors with a fine shape. The method for producing comb-shaped electrodesof the present invention includes a current collector forming step of forming a pair of comb-shaped current collectorson a surface of a substrate, a resist coating step of forming a resist layeron the surface of the substrate, and a guide hole forming step of forming guide holesfor forming a positive electrodeor a negative electrode, in which a cationic polymerization type resist composition (i), a novolak type resist composition (ii), a chemically-amplified type resist composition (iii), or a radical polymerization type resist composition (iv), is used as a resist composition for forming the resist layer

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Tokyo, Japan

Hirokazu Munakata