Alcántara Román, Ricardo

Cabello, Marta

Chyrka, Taras

González-Jiménez, José R.

López, María C.

Ortiz Jiménez, Gregorio F.

Tirado Coello, José Luis

Alcántara, Ricardo

Repositorio Institucional de la Universidad de Córdoba

   P18-CFQ  62 EFFECTS OF ELECTRODEPOSITED LITHIUM PHOSPHATE ON THE ELECTROCHEMICAL PROPERTIES OF SELF ORGANIZED TITANIA NANOTUBES Marta Cabelloa, María C. Lópeza, Taras Chyrkab, Gregorio F. Ortiza,                 a                   a            . Tiradoa  aLaboratorio de Química Inorgánica, Universidad de Córdoba, Edificio Marie Curie, Campus de Rabanales. 14071 Córdoba – España, E-mail: z22cabbm@uco.es  b Chem. Eng. Dep., NTUU “Kyiv polytechnic institute”, 03056, Kyiv, Ukraine   Solid electrolyte interfaces are crucial for the development of lithium-ion batteries. An alternative approach is to coat the electrodes with a convenient ionic conductor that warrants lithium ion diffusion from the electrolyte. Thin film electrodes prepared directly onto current collectors are particularly suitable to this approach. The compound Li3PO4 is known to be a potential candidate for thin film lithium electrolyte due to its light weight, wide potential range of stability vs. lithium and also because of its thermal and mechanical stability.1  The aim of this work is to prepare nanoarchitectured electrodes containing a thin layer of Li3PO4. The covering effect of Li3PO4 can be observed for 1 min of electrodeposition at 37.5 mA cm−2 as the nanotubes are filled (Fig. 1). Firstly, self organized TiO2 nanotubes are used to improve their electronic and ionic conductivity. The annealing condition allowed preparing βLi3PO4 (R.T. – 300 ºC) and γLi3PO4 (≥ 500 ºC).2 The discharge and charge plateau of Li3PO4free ntTiO2 samples were at approximately 1.75 and 1.9 V, respectively. For βLi3PO4/ntTiO2 and γLi3PO4/ntTiO2 samples deposited 1 min at 3.75 mA cm−2 a discharge/charge plateaus are observed at 1.78 and 1.86 V, which is ∼0.1 V lower in energy as compared with uncoated samples. The best capacity value of 500 µA h cm-2 was achieved for TiO2/γLi3PO4.  The optimum parameters for electrodeposition to achieve γ-Li3PO4 coating on the entire ntTiO2 array are 1 min and 3.75 μA cm−2. The performance of the ntTiO2/γ-Li3PO4 (LiPF6 in EC:DEC)/ LiFePO4 rocking-chair microbattery delivered a maximum capacity of 110 mA h g−1 at 5C rate when imposing a cathode-limited active mass ratio to the electrodes.2 The obtained low-voltage microbattery (<2.0 V) could fit to applications demanding small-scale electrical power.              The authors are indebted to MEC (MAT2011-22753), “Ramón y Cajal” contract (RYC-2010-05596) and “  nta de Anda  c a” (FQM-288 and FQM-7206).  __________ 1 Bates, J. B.; Dudney, N. J.; Gruzalski, G. R.; Zuhr, R. A.; Choudhury, A.; Luck, D. F.; Robertson, J. D. J. Power Sources 1993, 43, 103. 2 López, M.C.; Ortiz, G.F.; González, J.R.; Alcántara, R.; Tirado, J.L. ACS Appl. Mater. Interfaces 2014, 6, 5669. Figure 1. SEM image of nt-TiO2 with electrodeposited Li3PO4. 10 µm2 µmP

Effects of electrodeposited lithium phosphate on the electrochemical properties of self organized titania nanotubes

Effects of electrodeposited lithium phosphate on the electrochemical properties of self organized titania nanotubes

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