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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Producing high-performing silicon anodes by tailoring ionic liquids as electrolytes

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Sanchez-Ramirez, Nedher [1, 2] ; Assresahegn, Birhanu Desalegn [2] ; Torresi, Roberto M. [1] ; Belanger, Daniel [2]
Total Authors: 4
[1] Univ Sao Paulo, Dept Quim Fundamental, Inst Quim, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo - Brazil
[2] Univ Quebec Montreal, Dept Chim, Case Postale 8888 Succursale Ctr Ville, Montreal, PQ H3C 3P8 - Canada
Total Affiliations: 2
Document type: Journal article
Source: ENERGY STORAGE MATERIALS; v. 25, p. 477-486, MAR 2020.
Web of Science Citations: 1

Nanostructured silicon is a promising anode for the next generation of high-energy lithium ion batteries. The challenge for implementation of Si anode is the control of the continuous chemical reactivity at the electrode/electrolyte interface during lithiation and delithiation. Given their relevant physicochemical properties such as high stability, good transport properties and nonvolatility, ionic liquids can potentially alleviate the instability of the solid electrolyte interface layer due to the large volume changes of Si upon cycling. Since the properties of ionic liquids are modulated by the anion and cation, or both, a suitable selection must be made for each application. Here, we report the electrochemical performance of triethyl-n-pentylphosphonium bis(fluorosulfonyl) imide {[}P-2225] {[}FSI] and bis(fluorosulfonyl)imide N-methyl-N-butylpyrrolidinium {[}BMPYR] {[}FSI] ionic liquids as electrolyte solvents for silicon/poly(acrylonitrile), Si/PAN, composite electrode. After 1000 charge/discharge cycles, these composite anode-ionic liquid systems exhibit a specific delithiation capacity of approximately 1000 mAh.g(-1) at 1.0 A.g(-1) with a Coulombic efficiency approaching 100%. This demonstrates the superior performance of ionic liquids compared to classical organic alkyl carbonate solvent-based electrolytes and that are also the best among the reported state-of-the art ILs for silicon electrodes. (AU)

FAPESP's process: 15/26308-7 - Optimization of the physicochemical properties of nano -structured materials for applications in molecular recognition, catalysis and energy conversion/storage
Grantee:Roberto Manuel Torresi
Support type: Research Projects - Thematic Grants
FAPESP's process: 14/01987-6 - Study of lithium intercalation into different nanostructured cathode based on oxides of transition metal using ionic liquid (ILs) with low viscosity synthesized from phosphonium and tetracyanoborate like electrolytes.
Grantee:Nédher Sánches Ramírez
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 15/11164-0 - Study of lithiation of silicon nanopowder produced by induced plasma using ionic liquids as electrolytes
Grantee:Nédher Sánches Ramírez
Support type: Scholarships abroad - Research Internship - Post-doctor