Journal
RSC ADVANCES
Volume 5, Issue 110, Pages 90428-90436Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra19335d
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Funding
- FEDER funds through the Programa Operacional Factores de Competitividade - COMPETE
- FCT - Fundacao para a Ciencia e a Tecnologia [PEST-C/FIS/UI607/2014, PEST-C/QUI/UI0686/2013]
- FCT [SFRH/BD/90313/2012, SFRH/BPD/112547/2015]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/90313/2012] Funding Source: FCT
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Separator membranes based on poly(vinylidene fluoride-co-chlorotrifluoroethylene) (PVDF-CTFE) were prepared by a solvent casting technique based on its phase diagram in N, N-dimethylformamide (DMF) solvent. The microstructure of the PVDF-CTFE separator membranes depends on the initial position (temperature and concentration) of the solution in the phase diagram of the PVDF-CTFE/DMF system. A porous microstructure is achieved for PVDF-CTFE membranes with solvent evaporation temperatures up to 50 degrees C for a polymer/solvent relative concentration of 20 wt%. The ionic conductivity of the separator depends on the degree of porosity and electrolyte uptake, the highest room temperature value being 1.5 mS cm(-1) for the sample with 20 wt% of polymer concentration and solvent evaporation temperature at 25 degrees C saturated with 1 mol L-1 lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) in propylene carbonate (PC). This PVDF-CTFE separator membrane in Li/C-LiFePO4 half-cell shows good cyclability and rate capability, showing a discharge value after 50 cycles of 92 mA h g(-1) at 2C, which is still 55% of the theoretical value. PVDF-CTFE separators are thus excellent candidates for high-power and safe lithium-ion battery applications.
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