| CPC H01M 4/62 (2013.01) [H01M 4/13 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] | 5 Claims |
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1. A positive electrode for a secondary battery, comprising:
A current collector;
a protective layer formed on at least one surface of the current collector; and
a mixture layer formed on the protective layer,
wherein the protective layer has a first region and a plurality of second regions,
the first region includes inorganic particles and a conductive agent,
each of the plurality of second regions includes the inorganic particles and less than a detection limit of the conductive agent, or includes the inorganic particles and no less than the detection limit of the conductive agent, and
a content in % by mass, of the conductive agent in each of the plurality of second regions with respect to a total mass of the each of the plurality of second regions is lower than a content, in % by mass, of the conductive agent in the first region with respect to a total mass of the first region,
wherein the plurality of second regions are scattered on a surface of the current collector and an area per one of the plurality of second regions is 70 μm2 to 32000 μm2,
wherein the protective layer includes a binder, and a content of the binder is 0.1% by mass to 10% by mass with respect to a total mass of the protective layer, and
wherein a void ratio of the plurality of second regions is larger than a void ratio of the first region and is 10% to 50%.
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