A Bifunctional Fluorophosphate Electrolyte for Safer Sodium-Ion Batteries
| Autor: | Lifen Xiao, Xingwei Liu, Hanxi Yang, Xinping Ai, Xiaoyu Jiang, Yuliang Cao, Ziqi Zeng |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Sodium Materials Science Inorganic chemistry chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry Electrochemistry 01 natural sciences Article Energy Materials chemistry.chemical_compound Thermal stability Bifunctional lcsh:Science Alkyl chemistry.chemical_classification Multidisciplinary 021001 nanoscience & nanotechnology 0104 chemical sciences Anode Chemistry chemistry lcsh:Q 0210 nano-technology Carbon |
| Zdroj: | iScience, Vol 10, Iss, Pp 114-122 (2018) iScience |
| ISSN: | 2589-0042 |
| Popis: | Summary Most of the currently developed sodium-ion batteries (SIBs) have potential safety hazards due to the use of highly volatile and flammable alkyl carbonate electrolytes. To overcome this challenge, we report an electrochemically compatible and nonflammable electrolyte, tris(2,2,2-trifluoroethyl) phosphate (TFEP) with low-concentration sodium bis(fluorosulfonyl)imide (0.9 M), which is designed not only to match perfectly with the hard carbon (HC) anode but also to enhance the thermal stability of SIBs. Experimental results and theoretical calculations reveal that TFEP molecules have a significantly low barrier to decompose before Na+ inserts into HC, forming a stable inorganic solid-electrolyte interface layer, thus improving the electrochemical and structural stabilities of HC anodes. An HC/Na3V2(PO4)3 full cell using TFEP electrolyte shows a high capacity retention of 89.2% after 300 cycles and a dramatically reduced exothermic heat at elevated temperature, implying its potential application for safe and low-cost larger-scale energy storage. Graphical Abstract Highlights • A novel bifunctional TFEP electrolyte is designed for safe SIBs • The nonflammable TFEP electrolyte shows high electrochemical stability • TFEP solvent can participate in SEI formation at HC anode surface • The HC/NVP cell in TFEP electrolyte delivers high capacity with long working life Chemistry; Materials Science; Energy Materials |
| Databáze: | OpenAIRE |
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