Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.171
Publication date: 22nd December 2022
In this presentation, we report the impact of electrolyte solvents (EC:DEC and diglyme) with NaPF6 on the cycling stability and rate capability of Na2Ti3O7 (NTO). This material has been widely investigated as an anode for SIBs because of its reasonably high specific capacity (177 mAh g-1) and low insertion potential (0.2 V vs. Na+/Na, outside the stability window of electrolytes). However, its rapid capacity decay and rate capability have been highly linked to the formation of an unstable and thick SEI layer. Yet, many studies have focused on the improvement of NTO properties and to date no alternative electrolytes have been proposed. Overall, we observed that the electrochemical performance of Na/NTO half-cells in DiG outperformed that in the EC:DEC solvent in terms of specific capacity, rate capability and cycling stability. Furthermore, we provide a detailed interfacial analysis of both the SEI layer and charge-transfer processes using PES, electrochemical impedance spectroscopy and operando electrochemical AFM under different cycling regimes to explain the enhanced electrochemical behaviour observed in DiG, which results from the formation of a stable, thin and compact SEI.
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