Metal−Organic Framework Based PVDF Separators for High Rate Cycling Lithium-Ion Batteries

Poly(vinylidene fluoride) (PVDF) and MOF-808-based separators for lithium-ion batteries (LIBs) have been prepared and fully characterized in terms of morphological and thermal properties, electrolyte uptake, and retention, and surface hydrophilic characteristics. The effect of PVDF/MOF-808 separator...

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Bibliographic Details
Authors: Valverde de Mingo, Ainara, Gonçalves, Renato, Silva, Maria Manuela, Wuttke, Stefan, Fidalgo Marijuán, Arkaitz, Costa, Carlos M., Vilas Vilela, José Luis, Laza Terroba, José Manuel, Arriortua Marcaida, María Isabel, Lanceros Méndez, Senentxu, Fernández de Luis, Roberto
Format: article
Publication Date:2020
Country:España
Institution:Universidad del País Vasco
Repository:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/78010
Online Access:http://hdl.handle.net/10810/78010
Access Level:Open access
Keyword:separator membranes
MOF-808
PVDF
separator
lithium-ion battery
Description
Summary:Poly(vinylidene fluoride) (PVDF) and MOF-808-based separators for lithium-ion batteries (LIBs) have been prepared and fully characterized in terms of morphological and thermal properties, electrolyte uptake, and retention, and surface hydrophilic characteristics. The effect of PVDF/MOF-808 separators on the electrochemical performance of LIBs has been evaluated. The PVDF/MOF-808 membranes exhibit a well-defined porous structure with a uniform distribution of interconnected macro- to mesopores. The inclusion of the Zr-based MOF nanoparticles increases the porosity and surface area of the separator, enhancing the electrolyte uptake and the ionic conductivity. Finally, the presence of MOF-808 fillers improves the liquid electrolyte retention, which prevents the capacity fading at high C-rates cycling. Indeed, charge−discharge tests performed in Li/C-LiFePO4 half-cells reveal a discharge capacity of 68 mAh·.g−1 at 2C-rate for PVDF/MOF-808 membranes, in comparison with the 0 mAh·g−1 obtained for pure PVDF. The PVDF/10 wt % MOF-808 sample shows a long-term stable cycling behavior with a Coulombic efficiency close to 100%. Thus, it is shown that the composite membranes represent an improvement with respect to conventional separators for lithium ion battery applications, since they coupled the polymer meso- and macroporous structure with the wellordered microporous system of the MOFs, which improve significantly the electrolyte affinity.

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