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CO 2 treatment enables to recover low-valent metal oxides from spent Li(Ni 0.5 Co 0.2 Mn 0.3 )O 2 cathodes, which not only avoids the generation of explosive gases (H 2 ) during the acid leaching, but also allows Li extraction by simple water leaching.
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Deng et al. (2021) studied this question.
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