Abstract
TiNb6O17 and TiNb2O7 were synthesized using a solid-state method. The techniques were used to assess the electrochemical performance and lithium diffusion kinetics of TiNb6O17 related to the unit cell volume with TiNb2O7. The charge-discharge curves and cyclic voltammetry revealed TiNb6O17 to have a similar redox potential to TiNb2O7 as well as a high discharge capacity. The rate performance of TiNb6O17 was measured using a rate capability test. SSCV and EIS showed that TiNb6O17 had higher lithium diffusion coefficients during the charging. From GITT, the lithium diffusion coefficients at the phase transition region showed the largest increase from TiNb2O7 to TiNb6O17.
Highlights
Lithium secondary batteries have been studied for large scale energy devices, such as electric vehicles (EVs) and energy storage systems (ESSs), requiring high energy density and superior rate performance
The TiNb6O17 anode has a better lithium diffusion process than the TiNb2O7 anode. It is not the charge/discharge state, the results revealed the improved lithium diffusion kinetics of TiNb6O17 at the equilibrium state because the more open Li ion insertion site of TiNb6O17 than that of TiNb2O7 affects the barrier energy and electrostatic interaction regarding the Li+ insertion mechanism
Two titanium niobium oxide (TNO) materials showed three similar plateau regions and three redox peaks corresponding to two Nb redox and one Ti redox reaction
Summary
Received: 4 August 2017 Accepted: 13 November 2017 Published: xx xx xxxx performance of TiNb6O17 as an anode in lithium secondary battery. Titanium niobium oxide (TNO) materials, such as TiNb2O7 and Ti2Nb10O29, have been introduced as promising titanium-based anode materials owing to their nontoxic, good rate performance, low volume change, stable working voltage window (1–2.5 V), and high theoretical capacity (387~390mAh/g). They have lower capacity and reversibility than their theoretical capacities due to the low electric conductivity and lithium diffusion properties into the structure called Wesley-Roth 2D structure[7,8,9] To solve these problems, many studies have been conducted to achieve TNO materials with high reversible capacity and improved rate performance, such as doping with other metals (Ru, Mo, etc.) to achieve high ionic conductivity and electrical conductivity and controlling the particle shape and size[1,2,3,6,7,8,9,10,11,12]. The material showed a higher discharge capacity and better lithium diffusion coefficients by charge-discharge, rate capability, and slow scan cyclic voltammetry (SSCV) than Ti2Nb10O29 in Chunfu’s study[13]. (g) SEM images of TiNb6O17 (magnification ×5,000), and (h)~(i) EDS mapping images of oxygen, titanium, and niobium, and (k) the results of EDS analysis of TiNb2O7 and (l) TiNb6O17
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
