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Published on: November 11, 2013
Realizing the Storage Mechanisms Potentials Involving Multi-Ion Reactions for NASICON Cathodes in Rechargeable Hybrid
Adi Tiara Zikri1, Muqoil Darussalam1, Muhammad Hilmy Alfaruqi1
1Department of Material Science and Engineering, Chonnam National University, Gwangju, Republic of Korea.
Researchers explored new NASICON cathode materials, Na3Ti0.5VMn0.5(PO4)3 (NTVMP) and Na3Ti0.5VFe0.5(PO4)3 (NTVFP), for sodium-ion batteries. These materials show dual-ion storage mechanisms, enabling efficient energy storage for hybrid aqueous batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Sodium superionic conductor (NASICON) materials are promising for sodium-ion batteries.
- Current NASICON cathodes like Na3V2(PO4)3 (NVP) utilize expensive and toxic vanadium.
- There is a need for sustainable alternatives with comparable electrochemical performance.
Purpose of the Study:
- To investigate the energy storage mechanisms of dual-substituent NASICON materials, Na3Ti0.5VMn0.5(PO4)3 (NTVMP) and Na3Ti0.5VFe0.5(PO4)3 (NTVFP).
- To assess the potential of NTVMP and NTVFP as cathode materials for rechargeable hybrid aqueous batteries.
- To understand the ion insertion/extraction processes in these novel materials.
Main Methods:
- Galvanostatic charge-discharge cycling in a hybrid electrolyte (2 M CH3COONa + 1 M (CH3COO)2Zn).
- In situ X-ray diffraction (XRD) analysis.
- Ex situ X-ray analysis.
Main Results:
- NTVMP and NTVFP exhibited two distinct voltage plateaus during cycling.
- High-voltage plateau (~1.50 V) attributed to Zn2+ ion insertion/extraction.
- Low-voltage plateau (~0.30 V) attributed to Na+ ion insertion/extraction, indicating multi-ion reactions.
- Reversible changes in lattice parameters and transition metal states were observed via XRD, confirming reversible ion processes.
Conclusions:
- NTVMP and NTVFP demonstrate a dual-ion storage mechanism involving both Na+ and Zn2+ ions.
- These materials show potential for developing high-performance rechargeable hybrid aqueous batteries.
- The study provides insights into the energy storage mechanisms of NASICON-type materials with reduced vanadium content.
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