Enhanced electrochemical properties of Li[Li0.2Mn0.54Ni0.13Co0.13]O2 via lithium boron oxide glass surface treatment

• Published in: Solid state ionics 2016-09, Vol.292, p.66-69
• Main Authors: Bai, Maohui, Wang, Zhixing, Li, Xinhai, Guo, Huajun, He, Zhenjiang, Zhao, Junkai
• Format: Article
• Language: English
• Subjects: Cathode materials; Lithium boron oxide glass; Lithium-ion batteries; Surfaces
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/j.ssi.2016.05.013

A Li2O·2B2O3 layer is successfully coated on the surface of Li-rich layered cathode Li[Li0.2Mn0.54Ni0.13Co0.13]O2, which is demonstrated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The electrochemical performance of the pristine and LBO-coated materials have been investigated by galvanostatic charge/discharge. The experiment results indicate that the electrochemical performances of Li-rich cathode materials are obviously improved by LBO surface modification. Particularly, the sample with 3wt.% LBO-coating shows the best cycling performance, with capacity retention of 92% after 100cycles, which is much better than the pristine one. Electrochemical impedance spectroscopy (EIS) reveals that the enhanced electrochemical performances of the LBO-coated sample are due to the enhancement of surface electronic conductivity and the suppression of the decomposition of electrolyte. •Layered Li2O·2B2O3-coated Li[Li0.2Mn0.54Ni0.13Co0.13]O2 materials were synthetized.•The electrochemical properties were enhanced significantly by Li2O·2B2O3 coating.•The structure stability of materials could be increased by Li2O·2B2O3 coating.•Li2O·2B2O3-coated sample possessed superior electrochemical property.