TiO2 (B)/activated carbon non-aqueous hybrid system for energy storage

Thierry Brousse , René Marchand , Pierre-Louis Taberna (1) , Patrice Simon (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

TiO2 (B) has been investigated as a possible candidate to replace Li4Ti5O12 as a negative electrode for Li-ion battery. The starting compound was synthesized by a simple solid state reaction followed by hydrolysis. Long term stability of the TiO2 (B) electrode can be obtained by limiting lithium intercalation between 0.25 and 0.35 Li+ per unit formula. High cycling rates (up to 24C) have been used without noticeable degradation of the electrode. A non-aqueous hybrid energy storage device using TiO2 (B) as the negative electrode and activated carbon as the positive was assembled. The maximum hybrid cell voltage can be set between 2.75 V and 3.5 V. The cells exhibit energy densities between 45 W kg-1 and 80 W kg-1 with power densities in the range 240-420 W kg-1which is compatible with a fast charging/discharging storage device, intermediate between electrochemical double layer capacitor and Li-ion batteries.

Mots clés: Secondary cell; Supercapacitor Electrolytic capacitor; bElectrochemical double layer; Discharge charge cycle; Intercalation compound; Stability; Long term; Solid state reaction -Lithium battery; Anode; Energy storage; Hybrid system; Activated carbon; Titanium oxide; Secondary cell

Domaines: Matériaux

Thierry Brousse, René Marchand, Pierre-Louis Taberna, Patrice Simon. TiO2 (B)/activated carbon non-aqueous hybrid system for energy storage. Journal of Power Sources, 2006, 158 (1), pp.571-577. ⟨10.1016/j.jpowsour.2005.09.020⟩. ⟨hal-03482058⟩