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Preparation of Poly(vinylidene fluoride) Lithium‐Ion Battery Separators and Their Compatibilization with Ionic Liquid – A Green Solvent Approach
Author(s) -
Costa Carlos M.,
Rodrigues Henrique M.,
Gören Attila,
Machado Ana V.,
Silva Maria M.,
LancerosMéndez Senentxu
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201701028
Subject(s) - separator (oil production) , materials science , ionic liquid , electrolyte , ionic conductivity , fluoride , electrochemistry , chemical engineering , lithium ion battery , solvent , porosity , membrane , battery (electricity) , composite material , inorganic chemistry , chemistry , organic chemistry , electrode , power (physics) , physics , quantum mechanics , engineering , catalysis , biochemistry , thermodynamics
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 μm, 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–LiFePO 4 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.