Sodium titanate nanotubes as negative electrode materials for sodium-ion capacitors
ACS Applied Materials and Interfaces, ISSN: 1944-8244, Vol: 4, Issue: 5, Page: 2762-2768
2012
- 222Citations
- 119Captures
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Metrics Details
- Citations222
- Citation Indexes222
- 222
- CrossRef204
- Captures119
- Readers119
- 112
Article Description
The lithium-based energy storage technology is currently being considered for electric automotive industry and even electric grid storage. However, the hungry demand for vast energy sources in the modern society will conflict with the shortage of lithium resources on the earth. The first alternative choice may be sodium-related materials. Herein, we propose an electric energy storage system (sodium-ion capacitor) based on porous carbon and sodium titanate nanotubes (Na-TNT, Na -insertion compounds) as positive and negative electrode materials, respectively, in conjunction with Na -containing non-aqueous electrolytes. As a low-voltage (0.12 V) sodium insertion nanomaterial, Na-TNT was synthesized via a simple hydrothermal reaction. Compared with bulk sodium titanate, the predominance of Na-TNT is the excellent rate performance, which exactly caters to the need for electrochemical capacitors. The sodium-ion capacitors exhibited desirable energy density and power density (34 Wh kg , 889 W kg ). Furthermore, the sodium-ion capacitors had long cycling life (1000 cycles) and high coulombic efficiency (≈98 % after the second cycle). More importantly, the conception of sodium-ion capacitor has been put forward. © 2012 American Chemical Society.
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