doi:10.3850/978-981-08-6555-9_166

ABSTRACT

Two novel electrode materials for hybrid Li battery-supercapacitor systems were synthesized – nanosized electrochemically active oxide Li₄Ti₅O₁₂, produced by thermal decomposition of mixture of lithium and titanium oxalates, and activated nanoporous carbon, prepared by carbonization of mixture of coal tar pitch and furfural with subsequent hydrothermal treatment. The phase composition, microstructure, surface morphology and porous structure of the materials were studied and the main textural parameters as well as micropore size distribution of the carbons were determined. Composite electrodes based on the materials developed were assembled in order to achieve an optimal ratio between specific energy density and power rate while keeping a long cycle-life capability of the hybrid system. The electrochemical characteristics of model cells were examined and capacitance up to 150 Fg^-1 and current rate up to 600 mAg^-1 were obtained.

Keywords: Nanoporous carbon, Li₄Ti₅O₁₂ oxide, Composite electrode, Hybrid Li battery-capacitor.

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