Electrochimica Acta, Vol.186, 24-33, 2015
Improved the lithium storage capability of BaLi2Ti6O14 by electroless silver coating
To form BaLi2Ti6O14/Ag, highly dispersed Ag nanoparticles are successfully deposited on the surface of BaLi2Ti6O14 by a simple chemical deposition method. The morphology, quantity and size of Ag nanoparticles in BaLi2Ti6O14/Ag composites are significantly influenced by the Ag coating contents. Electrochemical results show that Ag nanoparticles play a positive role in reducing redox polarization and improving electrical conductivity of BaLi2Ti6O14 during lithiation/delithiation processes. Among all the as-obtained products, 6 wt.% Ag coated BaLi2Ti6O14 shows the highest initial charge specific capacity of 160 mAh g(-1) at the current density of 100 mA g(-1) (1C), which is much higher than the 149.1 mAh g(-1) for bare BaLi2Ti6O14. After 100 charge/discharge cycles, the reversible capacity can be maintained at 117.0 mAh g(-1). Moreover, this sample also shows excellent rate performance with high reversible charge capacities of 147.5, 139.7, 132.6, and 126.7 mAh g(-1) at the rates of 2C, 3C, 4C and 5C, respectively. Compared with bare BaLi2Ti6O14, the superior electrochemical performance indicates that BaLi2Ti6O14/Ag can be a good anode material in lithium ion batteries. (C) 2015 Elsevier Ltd. All rights reserved.
Keywords:BaLi2Ti6O14;Electroless silver coating;Anode materials;Rate performance;Lithium ion batteries