Sanyo Electric Co., Ltd.

Yuko Nowatari

Takahiro Isono

Takashi Yasuo

Naoya Tsukamoto

Katsura Kawata

A nonaqueous electrolyte secondary battery having an electrode group in which a positive electrode plate containing a positive electrode active material and a negative electrode plate containing a negative electrode active material are wound with a separator there between. The positive electrode active material uses a lithium transition metal oxide represented by the formula LiNiMO(0.9&#x2264;a&#x2264;1.2, 0.8&#x2264;x&#x3c;1, and M is at least one element of Co, Mn, and Al). The positive electrode plate is provided with a current-collecting tab placed in a position that is 200 mm or more apart from the winding start of the positive electrode plate. The separator has an MD direction tensile strength (S)-to-TD direction tensile strength (S) ratio (S/S) of from 0.72 to 1.37 and an MD direction tensile elongation (E)-to-TD direction tensile elongation (E) ratio (E/E) of from 0.34 to 1.29.

Nonaqueous electrolyte secondary battery

Provided is a fuel cell having improved ion conductivity in the catalyst layer. The catalyst layer includes a catalytic metal, a carbon particle, and an ion exchanger. The catalytic metal is carried on the carbon particle. The ion exchanger includes a first functional group capable of being adsorbed or bound to the catalytic metal, and a second functional group providing the ion conductivity. The ion exchanger is adsorbed or bound to the catalytic metal via the first functional group. The bond between the catalytic metal and the ion exchanger includes a covalent bond, a coordinate bond or an ion bond.

Catalyst layer for fuel cells and fuel cell using the same

A membrane electrode assembly includes an electrolyte membrane, anode catalyst layers, and cathode catalyst layers provided counter to the anode catalyst layers, respectively. An insulating layer is provided on the electrolyte membrane between adjacent anode catalyst layers. An insulating layer is provided on the electrolyte membrane between adjacent cathode catalyst layers. The resistivity of the insulating layer is preferably identical to or higher than that of the electrolyte membrane.

Membrane electrode assembly and fuel cell

Electro membrane assemblies are formed respectively in openings provided in a substrate. Each membrane electrode assembly is provided with an electrolyte membrane, an anode catalyst layer, and a cathode catalyst layer. A protective layer is provided on the substrate disposed between the adjacent anode catalyst layers. The other protective layer is provided on the substrate disposed between the adjacent cathode catalyst layers. The protective layer and the other protective layer preferably contain a resin whose number of C&#x2014;F bonds is greater than that of the substrate.

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Kobe, Japan

Yuko Nowatari