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Lithium-Ion accumulator

Source: gutefrage.net

At the right side of the graphic, the Cu changes while discharging into C as graphite. How and why does this happen?

I thought it happens because of the dissolving of the Cu when the electrons stream from the Cu to the Al.

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closed as unclear what you're asking by M.A.R. ಠ_ಠ, Todd Minehardt, airhuff, jerepierre, bon May 3 '17 at 20:15

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The electrode in here has two parts – the Cu and the graphite (C). The Cu won't dissolve. Only the graphite (C) will react. So there is no changing from Cu to C.

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