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In an LFP battery, $\ce{LiFePO4 -> FePO4 + Li+ + e-}$. $\ce{LiFePO4}$ is described as a grey, reddish grey, brown, or black solid on wikipedia and $\ce{FePO4}$ a yellow-brown solid. If you had a window into the battery could you see this color change occurring during use?

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  • $\begingroup$ I am not sure, if there are (colored) salts of transition metals, that have the same color at different metal oxidation states. $\endgroup$ – Poutnik Jul 22 at 6:16
  • $\begingroup$ Is LiFePO4 darker than FePO4 as described by Wikipedia solo because of the addition of carbon for conductivity in batteries? $\endgroup$ – bryan dunn Jul 31 at 23:46

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