Abstract: Spinel Li₄Ti₅O₁₂ for the lithium ion battery was used as an anode material, during the process of Li⁺ intercalation and de-intercalation, its crystal structure did almost no change, so it is regarded as a “zero strain” material. But Li₄Ti₅O₁₂ has a poor electric conductivity, only 10^-9 S/cm, which affects its cycling stability and high rate characteristics. Here, Li₄Ti₅O₁₂/polyacene (PAS) composite was prepared via a solid-state method using TiO₂-anatase, Li₂CO₃, and polymer degradation carbonousPolyacene(PAS) as precursors. Doping with PAS greatly improved the electric conductivity and electrochemical performance over the pure Li₄Ti₅O₁₂. The conclusion, which was measured by four-probe apparatus, showed that electric conducti-vity of the composite was enhanced for nine-magnitude order. The electrochemical tests indicated that the Li₄Ti₅O₁₂ doping with mass fraction of 10% of PAS exhibited the initial specific capacity is 137.3 mA·h/g at 10C, and it is still 100 mA·h/g over 200 cycles.

Key words: Lithium ion battery, Lithium titanium oxide, Polyacene, Composite