Abstract
In present work, lithium-rich layered transition metal oxide(LLO) was synthesized by a co-precipitation method in combination with a solid-state reaction. The graphene wrapped Li-rich layered oxide composite(LLO/Gra) was obtained by sintering the LLO/GO composite at 300 oC for 30 min in an air. The morphologies and the electrochemical performances were characterized by means of SEM, TEM, XRD, XPS, EIS and charge/discharge tests. The results indicated that the LLOe particles were uniformly wrapped with graphene. The resulting material exhibited better rate capability than that of pristine LLO since the wrapped graphene demonstrated the enhanced electronic conductivity. Accordingly, the capacity of 270 m Ah·g-1for the LLO/Gra composite could be obtained in a range of 2.0 to 4.8 V at 0.1C(20 m A·g-1), while approached to 200 m Ah·g-1at 1C, which is 15% higher than that of pristine LLO(170 m Ah·g-1).
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