Add time:07/29/2019         Source:sciencedirect.com

The weak rate capability and cyclic stability are stubborn issues limiting the application of intriguing lithium-rich layered oxide in the lithium-ion batteries. In this work, a glucose-based treatment was proposed to modify the microstructure and electrochemical properties of the lithium-rich layered oxide. A newly formed layered-spinel surface and chemically activated Li2MnO3 component were acquired through the glucose-based procedure. Notably increased initial coulombic efficiencies, discharge capacities, rate performance, and cyclic stability were observed in the modified samples. Typically, the discharge capacity and central voltage retentions after 100 cycles grow from 73.4% and 78.7% for the pristine to 84.1% and 86.2% for the treated sample. This improvement in electrochemical properties of the treated sample results from the co-contribution of the significantly promoted redox reaction at cathode surface, accelerated Li+ bulk diffusion rate, and tuned electrochemical evolution behavior of the lithium-rich layered oxide. This work provides a green and cost-efficient way for promoting the electrochemical properties of the lithium-rich layered oxide.

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