Abstract
A new flux synthesis is elaborately designed to synthesize LiNi0.5Co0.2Mn0.3O2 whose precursor is prepared by room-temperature solid-state reactions with the simultaneous formation of a composite flux medium NaNO3-NaCl. The NaNO3 in the precursor can release oxygen via thermal decomposition and thus an inner oxygen-rich environment within molten salt can be in situ created and ensures sufficient oxidation of partial Ni2+ to Ni3+ during flux synthesis of LiNi0.5Co0.2Mn0.3O2. Our comparative experiments demonstrate that this in situ self-oxygenation can then reduce the Li+/Ni2+ mixing in the obtained LiNi0.5Co0.2Mn0.3O2 and ultimately improved electrochemical performance is achieved as compared with that obtained by the traditional flux synthesis.
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