Fluorine doping and Al2O3 coating Co-modified Li [Li0.20Ni0.133Co0.133Mn0.534]O-2 as high performance cathode material for lithium-ion batteries

Lithium-rich layered oxide materials (LLOs) are widely studied due to its high reversible capacity. However, the stability during cycling and initial coulombic efficiency should be improved. Herein, we applied ball milling based facile calcination modification methods by combining doping fluorine and coating with Al2O3 to synthesis modified Li[Li0.20Ni0.133Co0.133Mn0.534]O-2 cathode materials for lithium-ion batteries. Characterization results of XRD, SEM and TEM show that fluorine doping could largely stabilized materials structure. Al2O3 coating is proved to improve LLOs' stability during cycling. The formation of Al-F-O-H type species proved by X-ray photoelectron spectra lead to improved discharge capacity and cycle performance. This work provides insight on the cost-effective production of high quality LLOs and helps determine appropriate modifications to improve the commercial utilization of LLOs. (C) 2017 Published by Elsevier B.V.