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https://hdl.handle.net/1822/31993
Título: | Influence of the porosity degree of poly(vinylidene fluoride-co-hexafluoropropylene) separators in the performance of Li-ion batteries |
Autor(es): | Sousa, R. E. Nunes-Pereira, J. Costa, C. M. Silva, Maria Manuela Lanceros-Méndez, S. Hassoun, J. Scrosat, B. Appetecchi, G. B. |
Palavras-chave: | Porous membranes Polyvinylidenedifluoride–hexafluoropropylene P(VdF–HFP) Lithium batteries |
Data: | Out-2014 |
Editora: | Elsevier 1 |
Revista: | Journal of Power Sources |
Citação: | Sousa, R. E., Nunes-Pereira, J., Costa, C. M., Silva, M. M., Lanceros-Méndez, S., Hassoun, J., ... & Appetecchi, G. B. (2014). Influence of the porosity degree of poly (vinylidene fluoride-co-hexafluoropropylene) separators in the performance of Li-ion batteries. Journal of Power Sources, 263, 29-36. |
Resumo(s): | Polyvinylidenedifluoride–hexafluoropropylene, (P(VdF–HFP))-based polymer electrolytes, as separators for lithium batteries, were prepared through different polymer/solvent (N,N-dimethylformamide, DMF) ratios and physicochemically investigated. Scanning electron microscopy measurements have shown a homogeneously distributed porosity within the membranes, with moderately tortuous pathways, resulting in a liquid uptake up to 77 wt.% with respect to the overall weight and conduction values above 10−3 S cm−1 at room temperature. Prolonged cycling tests, performed on Li/Sn–C and Li/LiFePO4 half-cells based on P(VdF–HFP) polymer electrolyte separator membranes, have evidenced nominal capacities ranging from 70% to 90% of the theoretical value with very good capacity retention and charge/discharge efficiency close at 100% even at high current rates. A capacity decay is observed at high current regime, associated to the diffusion phenomena occurring within the electrode and the polymer electrolyte separator membrane. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/31993 |
DOI: | 10.1016/j.jpowsour.2014.04.014 |
ISSN: | 0378-7753 |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CDF - FCD - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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PVDF-HFP.pdf Acesso restrito! | PVDF-HFP | 910,66 kB | Adobe PDF | Ver/Abrir |