Journal
NANO ENERGY
Volume 34, Issue -, Pages 188-194Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2017.02.012
Keywords
Hybrid Mg-Na ion battery; Na3V2(PO4)(3); Mg; XANES; Pair density function
Categories
Funding
- US Office of Naval Research [N00014-13-1-0543]
- National Science Foundation [CMMI-1400261]
- U.S. Department of Energy (DOE) Office of Electricity Delivery and Energy Reliability for the electrolyte synthesis [57558]
- DOE Office of Science [DE-AC02-06CH11357]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1400261] Funding Source: National Science Foundation
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Growing global demand of safe and low-cost energy storage technology triggers strong interests in novel battery concepts beyond state-of-art Li-ion batteries. Here we report a high-voltage rechargeable Mg-Na hybrid battery featuring dendrite-free deposition of Mg anode and Na-intercalation cathode as a low-cost and safe alternative to Li-ion batteries for large-scale energy storage. A prototype device using a Na3V2(PO4)(3) cathode, a Mg anode, and a Mg-Na dual salt electrolyte exhibits the highest voltage (2.60 V vs. Mg) and best rate performance (86% capacity retention at 10C rate) among reported hybrid batteries. Synchrotron radiation-based X-ray absorption near edge structure (XANES), atomic-pair distribution function (PDF), and high-resolution X-ray diffraction (HRXRD) studies reveal the chemical environment and structural change of Na3V2(PO4)(3) cathode during the Na ion insertion/deinsertion process. XANES study shows a clear reversible shift of vanadium K-edge and HRXRD and PDF studies reveal a reversible two-phase transformation and V-O bond length change during cycling. The energy density of the hybrid cell could be further improved by developing electrolytes with a higher salt concentration and wider electrochemical window. This work represents a significant step forward for practical safe and low-cost hybrid batteries.
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