Anatomy of a CR2032 Battery

Cool picture of the interior parts of a CR2032 battery:

Disassembled CR2032 battery From left — negative cup from inner side with layer of lithium (oxidized in air), separator (porous material), cathode (manganese dioxide), metal grid — current collector, metal casing (+) (damaged while opening the cell), on the bottom is plastic insulation ring

via Wikipedia article for Lithium battery

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