Effect of conductive additives and surface modification with NF3 and CIF3 on the charge/discharge behavior of Li4/3Ti5/3O4 (approximate to 4.6 mu m) was investigated using vapor grown carbon fiber (VGCF) and acetylene black (AB). VGCF and mixtures of VGCF and AB increased charge capacities of original Li4/3Ti5/3O4 and those fluorinated with NF3 by improving the electric contact between Li4/3Ti5/3O4 particles and nickel current collector. Surface fluorination increased meso-pore with diameter of 2 nm and surface area of Li4/3Ti5/3O4. which led to the increase in first charge capacities of Li4/3Ti5/3O4 samples fluorinated by NF3 at high current densities of 300 and 600 mA g(-1). The result shows that NF3 is the better fluorinating agent for Li4/3Ti5/3O4 than CIF3. (C) 2010 Elsevier B.V. All rights reserved.