Determining the oxidation states of dissolved transition metals in battery electrolytes from solution NMR spectra

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Determining the oxidation states of dissolved transition metals in battery electrolytes from solution NMR spectra

Allen, Jennifer P; Grey, Clare P

Chemical communications, 02/2023, Volume: 59, Issue: 12

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Dissolved transition metal ions can induce peak shifts in the NMR spectra of degraded battery electrolytes. Here, we exploit this staightforward, accessible method to calculate magnetic moments for dissolved Ni 2+ , Mn 2+ , Co 2+ , and Cu 2+ ; subsequent analysis of dissolution from LiMn 2 O 4 , LiNiO 2 , and LiNi 0.5 Mn 1.5 O 4 shows that the dissolved metals are exclusively divalent. Solution NMR of battery electrolytes reveals the oxidation states of metals dissolved from battery cathodes.

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