For practical, high-energy lithium ion batteries, we introduce an egg-shell structured LiCoO ₂ , enabling a credible performance with a high cut-off potential of 4.4 V, simply prepared by only stirring in 0.5 mM Cu(NO ₃ ) ₂ aqueous solution at room temperature without costly heat treatment.
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Kim et al. (2017) studied this question.
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