Girard, Gaetan M. A. ; Wang, Xiaoen ; Yunis, Ruhamah ; MacFarlane, Douglas R. ; Bhattacharyya, Aninda Jiban ; Forsyth, Maria ; Howlett, Patrick C. (2019) Sustainable, Dendrite Free Lithium‐Metal Electrode Cycling Achieved with Polymer Composite Electrolytes Based on a Poly(Ionic Liquid) Host Batteries & Supercaps, 2 (3). pp. 229-239. ISSN 2566-6223
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Official URL: http://doi.org/10.1002/batt.201800120
Related URL: http://dx.doi.org/10.1002/batt.201800120
Abstract
Polymer composite solid‐state electrolyte materials based on ionic liquids stand out as viable alternatives to flammable liquid electrolytes for solid state lithium‐metal batteries. They offer a compromise between favourable mechanical properties and stability against Li‐metal, coupled with favourable ion transport. However, insufficient Li+ transport properties for practical battery operation may result from the higher mobility of other ionic species from the ionic liquid (IL). Here, this issue was addressed by confining a highly concentrated IL electrolyte in a poly(ionic liquid) matrix with the addition of 5 wt % of alumina nanoparticles; these superconcentrated IL electrolytes favour Li+ ion transport. The composites are based on a poly(diallyldimethylammonium) bis(trifluoromethanesulfonyl)imide (PDADMA NTf2) matrix, and an electrolyte solution (ES) of high lithium concentration phosphonium IL, trimethyl(isobutyl)phosphonium bis(fluorosulfonyl)imide (P111i4FSI), with 3.8 mol kg−1 (3.8 m) LiFSI. The impact of ES content within the composite on Li+ transference number and electrochemical stability against Li‐metal is reported. For the 50 wt % ES and 50 wt % of PDADMA NTf2 composite, up to 0.5 mAh cm−2 of Li‐metal plating/stripping for over 20 days at 50 °C is shown. Scanning electron microscopy (SEM) confirmed that no Li dendrite formation was visible at the Li‐metal/polymer composite interface. Competitive performance of LiFePO4 electrodes (1.2 mAh cm−2) is also reported.
Item Type: | Article |
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Source: | Copyright of this article belongs to John Wiley & Sons, Inc. |
Keywords: | Ion Transport; Lithium-metal; Pdadma; Phosphonium Ionic Liquids; Polymer Composite. |
ID Code: | 116755 |
Deposited On: | 09 Apr 2021 09:13 |
Last Modified: | 09 Apr 2021 09:13 |
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