Ag enhanced electrochemical performance for Na 2 Li 2 Ti 6 O 14 anode in rechargeable lithium-ion batteries

Abstract Due to the characteristics of an electronic insulator, Na 2 Li 2 Ti 6 O 14 always suffers from low electronic conductivity as anode material for lithium storage. Via Ag coating, Na 2 Li 2 Ti 6 O 14 @Ag is fabricated, which has higher electronic conductivity than bare Na 2 Li 2 Ti 6 O 14 . Enhancing the Ag coating content from 0.0 to 10.0 wt%, the surface of Na 2 Li 2 Ti 6 O 14 is gradually deposited by Ag nanoparticles. At 6.0 wt%, a continuous Ag conductive layer is formed on Na 2 Li 2 Ti 6 O 14 . While, particle growth and aggregation take place when the Ag coating content reaches 10.0 wt%. As a result, Na 2 Li 2 Ti 6 O 14 @6.0 wt% Ag displays better cycle and rate properties than other samples. It can deliver a lithium storage capacity of 131.4 mAh g −1 at 100 mA g −1 , 124.9 mAh g −1 at 150 mA g −1 , 119.1 mAh g −1 at 200 mA g −1 , 115.8 mAh g −1 at 250 mA g −1 , 111.9 mAh g −1 at 300 mA g −1 and 109.4 mAh g −1 at 350 mA g −1 , respectively.