The liquid ammoniate of sodium iodide as an alternative electrolyte for sodium ion batteries: The case of titanium dioxide nanotube electrodes

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Title: The liquid ammoniate of sodium iodide as an alternative electrolyte for sodium ion batteries: The case of titanium dioxide nanotube electrodes
Authors: Ruiz Martínez, Débora | Gómez, Roberto
Research Group/s: Grupo de Fotoquímica y Electroquímica de Semiconductores (GFES)
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Titanium dioxide | Amorphous nanotubes | Inorganic electrolytes | Ammonia solvates | Sodium ion batteries
Knowledge Area: Química Física
Issue Date: Nov-2019
Publisher: Elsevier
Citation: Energy Storage Materials. 2019, 22: 424-432. doi:10.1016/j.ensm.2019.07.036
Abstract: Efforts for the development of sodium ion batteries (NIB) are focusing on insertion electrode materials rather than on novel electrolytes. In a radically new approach, sodium insertion into amorphous TiO2 nanotubes, chosen as a typical electrode material for NIBs, is studied for the NaI liquid ammoniate (NaI·3.3NH3) and compared with the behavior in typical organic electrolytes (for instance 1 M NaClO4 in propylene carbonate, PC). The liquid ammoniate leads to significantly larger electrode capacities (between 0.5 and 2.6 V vs. Na+/Na): 145 mA h g−1 in NaI·3.3NH3 versus 105 mA h g−1 in 1M NaClO4/PC at 1 mA cm−2 (14C for the ammoniate). This is linked to the outstanding conductivity and sodium concentration of NaI·3.3NH3, together with the much smaller charge transfer resistance observed for this electrolyte. In more general vein, the prospects for using the NaI·3.3NH3 liquid ammoniate in NIBs are finally discussed.
Sponsor: This work was partly supported by the Ministry of Science, Innovation and Universities through projects MAT2015-71727-R and RTI2018-102061-B-I00 (FONDOS FEDER).
URI: http://hdl.handle.net/10045/97018
ISSN: 2405-8297
DOI: 10.1016/j.ensm.2019.07.036
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2019 Elsevier B.V.
Peer Review: si
Publisher version: https://doi.org/10.1016/j.ensm.2019.07.036
Appears in Collections:INV - GFES - Artículos de Revistas

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