A novel intrinsically porous separator for self-standing lithium-ion batteries |
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Authors: | Pier Paolo Prosini Paola VillanoMaria Carewska |
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Affiliation: | ENEA, IDROCOMB, C.R. Casaccia, S.P. 89, Via Anguillarese 301, 00060-Rome, Italy |
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Abstract: | γ-LiAlO2, Al2O3 and MgO were used as fillers in a PVdF-HFP polymer matrix to form self-standing, intrinsically porous separators for lithium-ion batteries. These separators can be hot-laminated onto the electrodes without losing their ability to adsorb liquid electrolyte. The electrochemical stability of the separators was tested by constructing half-cells with the configuration: Li/fibre-glass/filler-based separator/electrode. MgO-based separators were found to work well with both positive and negative electrodes. An ionic conductivity of about 4×10−4 S cm−1 was calculated for the MgO-based separator containing 40% 1 M solution of LiPF6 in an EC/DMC 1:1 solvent. Self-standing, lithium-ion cells were constructed using the MgO-based separator and the resulting battery performance evaluated in terms of cyclability, power and energy density. |
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Keywords: | Lithium-ion batteries PVdF-HFP Polymer electrolyte |
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