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A redox-active organic salt for safer Na-ion batteries.
- Source :
-
Nano energy [Nano Energy] 2020 Jun; Vol. 72. Date of Electronic Publication: 2020 Mar 13. - Publication Year :
- 2020
-
Abstract
- Overcharge abuse can trigger thermal runaway when a device is left unattended. Redox shuttles, as economic and efficient electrolyte additives, have been proven to provide reliable and reversible protection for state-of-art Li-ion batteries (LIBs) against overcharge. Here, a functional organic salt, trisaminocyclopropenium perchlorate (TAC•ClO <subscript>4</subscript> ), is developed and employed as a redox shuttle for overcharge protection in a Na-ion battery system. This type of novel redox shuttle molecule is reported for the first time. As a unique ionic compound with the smallest aromatic ring structure, TAC•ClO <subscript>4</subscript> exhibits distinctive attributes of fast diffusion, high solubility, and ultrahigh chemical/electrochemical stability in both redox states. With merely 0.1 M TAC•ClO <subscript>4</subscript> in electrolyte, Na <subscript>3</subscript> V <subscript>2</subscript> (PO <subscript>4</subscript> ) <subscript>3</subscript> cathode can carry overcharge current even up to 10C or 400% SOC. Na <subscript>3</subscript> V <subscript>2</subscript> (PO <subscript>4</subscript> ) <subscript>3</subscript> /hard carbon cells demonstrated strong anti-overcharging ability of 176 cycles at 0.5C rate and 54 cycles at 1C rate with 100% overcharge. Moreover, TAC•ClO <subscript>4</subscript> addition has little impact on the electrochemical performance of Na-ion batteries, especially on the rate performance and the initial Columbic efficiency. Interestingly, a unique and reversible electrochromic behavior of TAC•ClO <subscript>4</subscript> electrolyte can promptly provide the device an overcharge alarm under a designed potential to further enhance the safety level.
Details
- Language :
- English
- ISSN :
- 2211-2855
- Volume :
- 72
- Database :
- MEDLINE
- Journal :
- Nano energy
- Publication Type :
- Academic Journal
- Accession number :
- 34109105
- Full Text :
- https://doi.org/10.1016/j.nanoen.2020.104705