Electrochemistry of sodium titanate nanotubes as a negative electrode for sodium-ion batteries

Author(s)

Leite, Marina M. ^[1] ; Martins, Vitor L. ^[1] ; Vichi, Flavio M. ^[1] ; Torresi, Roberto M. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: Electrochimica Acta; v. 331, JAN 20 2020.
• Web of Science Citations: 3

Abstract

Sodium-ion batteries are a promising alternative to lithium-ion devices, but the development of proper negative electrode materials is still challenging. Here, the properties of a low-voltage sodium titanate material are evaluated. Sodium titanate nanotubes (NTO) were produced by an alkalyne alkaline hydrothermal treatment with TiO2 and consisted of a hydrated Na1.4H0.6Ti3O7 with a surface area of 128 m(2) g(-1). NTO electrode kinetics were studied by cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic intermittent titration techniques. The (de)intercalation of Na+ ions involved two redox pairs at 0.3/0.5 V and 1.0/1.2 V, associated with the present mixture of nanotubes and nanosheets. Surface processes had a 95% coulombic efficiency and a high contribution even at low scan rates, accounting for 47% of the total capacity at 0.5 mV s(-1). Upon Na+ removal, the electronic resistance and the semiconductor capacitance increased. Battery tests performed on Na vertical bar NTO half-cells showed a reversible capacity of 90 mA h g(-1) at 10 mA g(-1) and near 100% coulombic efficiency at current rates ranging from 10 mA g(-1) to 10 A g(-1). Additionally, NTO presented a good capacity retention of 92% after 170 cycles at 100 mA g(-1). (c) 2019 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 15/26308-7 - Optimization of the physicochemical properties of nano -structured materials for applications in molecular recognition, catalysis and energy conversion/storage
• Grantee: Roberto Manuel Torresi
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 18/13492-2 - Synthetic and natural scaffolds applied to regenerative medicine
• Grantee: Luiz Henrique Catalani
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 19/02669-1 - Quartz crystal microbalance with dissipation for characterization of adsorption/adhesion processes of proteins and cells on biomaterials
• Grantee: Marina Moraes Leite
• Support Opportunities: Scholarships in Brazil - Technical Training Program - Technical Training