Abstract:

A new type of hybrid capacitor was fabricated using lithium titanate (Li₄Ti₅O₁₂) with different conductive additives and activated carbon. Influence of conductive additives on electrochemical performance of hybrid capacitor was investigated. After using SEM and electrochemical performance analysis, the most outstanding conductive additives for Li₄Ti₅O₁₂ have been figured out. The results indicate that with the adding of super-P/VGCF, the hybrid capacitor can embraced the best performance. When testing at 0.1A·g^–1 and 2A·g^–1 the capacitor can be shown the highest capacitance (45.4F·g^–1 at 0.1A·g^–1) and best rate performance (91.5% at 2A·g^–1). Meantime the capacitor still maintains 93.2% of its initial capacitance after 10000 cycles at 0.5A·g–1.

Key words: lithium titanate, conductive carbon black, graphene, carbon nanotubes, vapor grown carbon fiber