CPC H01M 8/0232 (2013.01) [C22C 19/03 (2013.01); H01M 8/0236 (2013.01); H01M 8/0241 (2013.01)] | 15 Claims |
1. A porous body comprising a framework having a three-dimensional network structure,
the framework having a body including crystal grains including nickel and cobalt as constituent elements,
the cobalt having a proportion in mass of 0.2 or more and 0.8 or less with respect to a total mass of the nickel and the cobalt,
the crystal grains having a shorter grain diameter of 2 μm or more, as determined in a first observed image obtained by observing the body of the framework in cross section at a magnification of 200 times, wherein
when the body of the framework is observed in cross section at a magnification of 3,000 times to obtain a second observed image, the second observed image presents in any area 10 μm square thereof five or less voids each having a longer diameter of 1 μm or more.
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