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A Bifunctional Fluorophosphate Electrolyte for Safer Sodium-Ion Batteries

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) phosp...

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Detalles Bibliográficos
Autores principales: Jiang, Xiaoyu, Liu, Xingwei, Zeng, Ziqi, Xiao, Lifen, Ai, Xinping, Yang, Hanxi, Cao, Yuliang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6279964/
https://www.ncbi.nlm.nih.gov/pubmed/30513393
http://dx.doi.org/10.1016/j.isci.2018.11.020
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author Jiang, Xiaoyu
Liu, Xingwei
Zeng, Ziqi
Xiao, Lifen
Ai, Xinping
Yang, Hanxi
Cao, Yuliang
author_facet Jiang, Xiaoyu
Liu, Xingwei
Zeng, Ziqi
Xiao, Lifen
Ai, Xinping
Yang, Hanxi
Cao, Yuliang
author_sort Jiang, Xiaoyu
collection PubMed
description 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/Na(3)V(2)(PO(4))(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.
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spelling pubmed-62799642018-12-14 A Bifunctional Fluorophosphate Electrolyte for Safer Sodium-Ion Batteries Jiang, Xiaoyu Liu, Xingwei Zeng, Ziqi Xiao, Lifen Ai, Xinping Yang, Hanxi Cao, Yuliang iScience Article 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/Na(3)V(2)(PO(4))(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. Elsevier 2018-11-15 /pmc/articles/PMC6279964/ /pubmed/30513393 http://dx.doi.org/10.1016/j.isci.2018.11.020 Text en © 2018 The Author(s) http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Article
Jiang, Xiaoyu
Liu, Xingwei
Zeng, Ziqi
Xiao, Lifen
Ai, Xinping
Yang, Hanxi
Cao, Yuliang
A Bifunctional Fluorophosphate Electrolyte for Safer Sodium-Ion Batteries
title A Bifunctional Fluorophosphate Electrolyte for Safer Sodium-Ion Batteries
title_full A Bifunctional Fluorophosphate Electrolyte for Safer Sodium-Ion Batteries
title_fullStr A Bifunctional Fluorophosphate Electrolyte for Safer Sodium-Ion Batteries
title_full_unstemmed A Bifunctional Fluorophosphate Electrolyte for Safer Sodium-Ion Batteries
title_short A Bifunctional Fluorophosphate Electrolyte for Safer Sodium-Ion Batteries
title_sort bifunctional fluorophosphate electrolyte for safer sodium-ion batteries
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6279964/
https://www.ncbi.nlm.nih.gov/pubmed/30513393
http://dx.doi.org/10.1016/j.isci.2018.11.020
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