No abstract

The effect of conductive additives and surface fluorination on the charge/discharge behavior of Li 4/3 Ti 5/3 O 4 was investigated.Mixtures of acetylene black ͑AB͒ and vapor-grown carbon fiber ͑VGCF͒ gave larger first charge capacities at a high current density of 600 mA/g than those obtained when AB or VGCF was used as a conductive additive by improving the electric contact between Li 4/3 Ti 5/3 O 4 particles and a nickel current collector. The surface fluorination of Li 4/3 Ti 5/3 O 4 by NF 3 improved the thermal stability of the electrolyte solution without decreasing first charge capacities and first coulombic efficiencies.