High Energy and Power Density TiO2 Nanotube Electrodes By Conformal Electrodeposition of Polymer Electrolyte
In this work, we study the conformal electrodeposition of PMMA-(PEO)5 copolymer on TiO2NTs by electrochemical techniques. The physical and chemical analyses of the electrodeposited polymer carried out by SEM, TEM, XPS, TGA, and NMR will be discussed in order to understand the relationship existing between the EDP parameters and the properties of the polymers.
Then, the benefits of the conformal coating of polymer electrolyte on the electrochemical performance in terms of energy density and power density will be highlighted. Actually, due to better electrode/electrolyte interface, we show that the capacity of the half cell is improved by 45% at 1 C compared to bare TiO2NTs (Fig. 1). Furthermore, we report that the polymer-coated TiO2nts tested in the full cell deliver an average capacity of ∼30 μA h cm−2 (120 mA h g−1) with LiNi0.5M1.5O4, ∼25 μA h cm−2 (100 mA h g−1) with LiFePO4 and ∼23 μA h cm−2 (90 mA h g−1) with LiCoO2, respectively during 50 cycles (Fig. 2).
1. B. L. Ellis, P. Knauth, and T. Djenizian, Adv. Mater, 26, 3368, (2014).
2. T. Djenizian, I. Hanzu, P. Knauth, J. Mater. Chem., 21, 9925, (2011).
3. N. A. Kyeremateng, F. Dumur, P. Knauth, B. Pecquenard, and T. Djenizian, Electrochem. Commun., 13, 894 (2011).