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A plateau with a median voltage of ∼5 V, possibly due to Li + ions occupying octahedral sites in the spinel structure, has been observed on charging crystalline spinel thin‐film cathodes to 5.3 V. The total charge extracted from the 4 and 5 V plateaus corresponds to , but the distribution of capacity between the two plateaus varies from film to film. After charging to 5.3 V, the cathodes were irreversibly changed: the capacity of the 4 V plateau increased by as much as 50%, but the cell resistance also increased significantly due to degradation of the cathode.
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Bates et al. (1995) studied this question.
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