PO43− polyanion-doped Li-rich layered oxides offer excellent energy density retention during long cycling due to the stronger anion bonding of PO43− polyanions to transition metal cations.
Enhancement of the discharge capacity, high-rate capability, and cycle stability of the Li-rich layered Li(Li 0.17 Ni 0.25 Mn 0.58 )O 2 oxide with a large specific capacity is highly significant for high energy lithiumion batteries. In this work, the Li-rich layered Li(Li 0.17 Ni 0.25 Mn 0.58 )O 2 oxide is prepared by a spray-drying method. The surface modification with the Li-Mn-PO 4 is introduced onto Li-rich layered Li(Li 0.17 Ni 0.25 Mn 0.58 )O 2 oxide for the first time. It is demonstrated that the surface of Li(Li 0.17 Ni 0.25 Mn 0.58 ) O 2 grains is coated with the thin amorphous Li-Mn-PO 4 layer (5 wt%). With increasing calcination temperature after the surface coating, a strong interaction can be induced on the interface between the amorphous Li-Mn-PO 4 layer and the top surface of Li(Li 0.17 Ni 0.25 Mn 0.58 )O 2 grains. As anticipated, the discharge capacity and high-rate capability are obviously improved for the Li-Mn-PO 4 -coated sample after calcination at 400 C, while excellent cycle stability is obtained for the Li-Mn-PO 4 -coated sample after calcination at 500 C as compared with the as-prepared Li(Li 0.17 Ni 0.25 Mn 0.58 )O 2 oxide during cycling. Apparently, the interface interaction between the amorphous Li-Mn-PO 4 layer and the top surface of Li(Li 0.17 Ni 0.25 Mn 0.58 )O 2 grains is responsible for the improvement of the reaction kinetics and the electrochemical cycle stability of Li-Mn-PO 4 -coated samples.
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