Journal of Industrial and Engineering Chemistry, Vol.68, 180-186, December, 2018
Selective doping of Li-rich layered oxide cathode materials for high-stability rechargeable Li-ion batteries
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We report the discovery of Li-rich Li1+x[(Ni0.225Co0.15Mn0.625)1-yVy]O2 as a cathode material for rechargeable lithium-ion batteries in which a small amount of tetravalent vanadium (V4+) is selectively and completely incorporated into the manganese sites in the lattice structure. The unwanted oxidation of vanadium to form a V2O5-like secondary phase during high-temperature crystallization is prevented by uniformly dispersing the vanadium ions in coprecipitated [(Ni0.225Co0.15Mn0.625)1?yVy](OH)2 particles. Upon doping with V4+ ions, the initial discharge capacity (>275 mA h g-1), capacity retention, and voltage decay characteristics of the Li-rich layered oxides are improved significantly in comparison with those of the conventional undoped counterpart.
Keywords:Lithium-rich layered oxide;Vanadium ion;Coprecipitation;Selective doping site;Rechargeable lithium-ion batteries
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