Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/48574
Título: | On the relevance of the polar β-phase of poly(vinylidene fluoride) for high performance lithium-Ion battery separators |
Autor(es): | Kundu, Manab Costa, Carlos M. Dias, Juliana Cristina Rodrigues Maceiras, Alberto Vilas, José Luis Lanceros-Méndez, S. |
Palavras-chave: | energy Li-ion batteries |
Data: | 2017 |
Editora: | American Chemical Society |
Revista: | Journal of Physical Chemistry C |
Citação: | Kundu, M., Costa, C. M., Dias, J., Maceiras, A., Vilas, J. L., & Lanceros-Méndez, S. (2017, November 17). On the Relevance of the Polar β-Phase of Poly(vinylidene fluoride) for High Performance Lithium-Ion Battery Separators. The Journal of Physical Chemistry C. American Chemical Society (ACS). http://doi.org/10.1021/acs.jpcc.7b09227 |
Resumo(s): | Separator membranes based on poly(vinylidene fluoride), PVDF, poly(vinylidene fluoride-co-trifluoroethylene), PVDF-TrFE, poly(vinylidene fluoride-co-hexafluropropylene), PVDF-HFP and poly(vinylidene fluoride-co-chlorotrifluoroethylene), PVDF-CTFE were prepared by solvent casting method using N,N-dimethylformamide (DMF) as solvent. In all cases, the same polymer/solvent ratio and solvent evaporation temperature were used. For all membranes, porous microstructure is achieved with a degree of porosity larger than 50%. The β-phase content as well as degree of crystallinity were different for each membrane, which were lower for the co-polymer membranes when compared with PVDF. On the other hand, the observed ionic conductivity values, electrolyte uptake, tortuosity and MacMullin number were similar for all membranes. The electrochemical performance of the separator membranes was evaluated in Li/C–LiFePO4 half-cell configuration showing good cyclability and rate capability for all membranes. Among the all separator membranes, PVDF-TrFE demonstrate the best electrochemical performance, with a discharge capacity value of 87 mAh.g-1 after 50 cycles with a capacity retention of 78 % at 2C.Finally, the correlation between the β-phase content in the membranes and the cycling performance was demonstrated (which was significant at high-C rates): larger β-phase contents, leading higher polarity, facilitates faster lithium ion migration within the separator for similar microstructures. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/48574 |
DOI: | 10.1021/acs.jpcc.7b09227 |
ISSN: | 1932-7447 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDF - FCD - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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4 polymers_F.pdf | 1,59 MB | Adobe PDF | Ver/Abrir |