Issue 33, 2023

Ultra-high initial coulombic efficiency of the TiO2 anode induced by the synergistic role of the electrolyte and binder for sodium-ion batteries

Abstract

The TiO2 anode for sodium-ion batteries (SIBs) is currently drawing increased attention owing to its stable cycling performance. However, the storage performance is still extremely inadequate, especially for its low initial coulombic efficiency (ICE). In order to further improve the ICE, a good match of the electrolyte and binder is crucial, due to the fact that a solid electrolyte interface (SEI) is irreversibly formed on the surface, which will be very important for its reversible capacity. As an attempt, TiO2 nanocrystallites are prepared by an electrochemical method. When applied as the anode for SIBs, the TiO2 electrode with the sodium carboxymethylcellulose binder and ether-based electrolyte presents an impressive capacity of 166.23 mA h gāˆ’1 at 2C after 4800 cycles, much higher than that with the polyvinylidene fluoride binder and carbonate-based electrolyte. A series of characterization studies reveal that the charge transfer at the interface between the electrolyte and electrode and the SEI film are the key factors determining the electrochemical properties. Importantly, the dual optimization of the binder and electrolyte is revealed to be an effective means to enhance the ICE of TiO2 up to 81.6%, thus greatly contributing to better guidance on the design of TiO2 anodes with ultra-high ICE for SIBs.

Graphical abstract: Ultra-high initial coulombic efficiency of the TiO2 anode induced by the synergistic role of the electrolyte and binder for sodium-ion batteries

  • This article is part of the themed collection: #MyFirstJMCA

Supplementary files

Article information

Article type
Paper
Submitted
13 Apr 2023
Accepted
27 Jul 2023
First published
28 Jul 2023

J. Mater. Chem. A, 2023,11, 17710-17717

Ultra-high initial coulombic efficiency of the TiO2 anode induced by the synergistic role of the electrolyte and binder for sodium-ion batteries

L. Yang, Y. Yang, W. Shi, S. Leng, D. Cheng and H. Hou, J. Mater. Chem. A, 2023, 11, 17710 DOI: 10.1039/D3TA02221H

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements