Journal
CHEMISTRYSELECT
Volume 2, Issue 19, Pages 5394-5402Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.201701028
Keywords
Green solvent; Ionic liquid; Lithium-ion batteries; PVDF separator
Categories
Funding
- Portuguese Foundation for Science and Technology (FCT) [UID/FIS/04650/2013]
- COMPETE Programme and National Funds through FCT [PTDC/CTM-ENE/5387/2014, UID/CTM/50025/2013, SFRH/BD/90313/2012, SFRH/BPD/112547/2015]
- Spanish Ministry of Economy and Competitiveness (MINECO) [MAT2016-76039-C4-3-R]
- Basque Government Industry Department under the ELKARTEK program
- Fundação para a Ciência e a Tecnologia [UID/CTM/50025/2013, PTDC/CTM-ENE/5387/2014, SFRH/BD/90313/2012] Funding Source: FCT
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Battery separator membranes for lithium-ion batteries have been developed based on poly(vinylidene fluoride), PVDF, and using the green solvent - N,N'-dimethylpropyleneurea (DMPU). This separator presents a porous microstructure with a degree of porosity of 20% and pore size below 1 mm, showing excellent mechanical properties. Further, its ionic conductivity, tortuosity and MacMullin number values are 0.1 mS.cm(-1), 4 and 82, respectively. This PVDF separator membrane was evaluated in Li/C-LiFePO4 half-cells with electrolyte solution showing good cyclability and rate capability, with a discharge value after 50 cycles of 56 mAh.g(-1) at C, corresponding to 50% of the capacity retention. Its electrochemical performance soaked in ionic liquid presents a discharge capacity of 45 mAh.g(-1) at C/5-rate and capacity retention of 60%, respectively. Thus, this separator is an appropriate candidate for environmentally friendlier and safer lithium-ion batteries.
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