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Fluorine-doped spherical spinel LiMn 2 O 4 was prepared by controlled crystallization from cheap carbonates. The fluorine bulk and surface doping of spherical samples showed different effects at the same doping amount. 5% fluorine surface-doped sample with Li/Mn=1.15/2 presented both good cycleability and high tap density of 2.1 g cm −3 . Its initial specific capacities were...
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