Publicação
Effect of cyano dipolar groups on the performance of lithium-ion battery electrospun polyimide gel electrolyte membranes
| Resumo: | Three polyimide membranes (polymer 0CN, copolymers 0CN/2CN (50/50) and polymer 2CN), with and without –CN dipolar groups, have been prepared by electrospinning and evaluated as lithium-ion battery separators. The prepared membranes show average fiber diameters between 0.5 and 1.09 μm and a degree of porosity of ~80%. The thermal stability, uptake, tortuosity and ionic conductivity values are influenced by the presence of the –CN dipolar groups in the polyimide polymer chain. The best battery performance in LFP/Li system is obtained for the 0CN sample, which shows discharge capacity values of 149.7 mAh.g-1, 146.5 mAh.g-1 and 124.6 mAh.g-1 at C/20, C/10 and C/5, respectively. The obtained high solution uptake, ionic conductivity values and rate capability show that these materials are promising candidates for battery separators for rechargeable lithium-ion batteries, when compared to glass microfibre separators. |
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| Autores principais: | Maceiras, A. |
| Outros Autores: | Goren, A.; Sencadas, Vítor João Gomes Silva; Costa, C. M.; Vilas, J. L.; Lanceros-Méndez, S.; Leon, L. M. |
| Assunto: | Polyimide Battery separator Gel electrolyte Lithium-ion battery |
| Ano: | 2016 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso restrito |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | Three polyimide membranes (polymer 0CN, copolymers 0CN/2CN (50/50) and polymer 2CN), with and without –CN dipolar groups, have been prepared by electrospinning and evaluated as lithium-ion battery separators. The prepared membranes show average fiber diameters between 0.5 and 1.09 μm and a degree of porosity of ~80%. The thermal stability, uptake, tortuosity and ionic conductivity values are influenced by the presence of the –CN dipolar groups in the polyimide polymer chain. The best battery performance in LFP/Li system is obtained for the 0CN sample, which shows discharge capacity values of 149.7 mAh.g-1, 146.5 mAh.g-1 and 124.6 mAh.g-1 at C/20, C/10 and C/5, respectively. The obtained high solution uptake, ionic conductivity values and rate capability show that these materials are promising candidates for battery separators for rechargeable lithium-ion batteries, when compared to glass microfibre separators. |
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