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Nanosponge-Based Composite Gel Polymer Electrolyte for Safer Li-O 2 Batteries.
- Source :
-
Polymers [Polymers (Basel)] 2021 May 17; Vol. 13 (10). Date of Electronic Publication: 2021 May 17. - Publication Year :
- 2021
-
Abstract
- Li-O <subscript>2</subscript> batteries represent a promising rechargeable battery candidate to answer the energy challenges our world is facing, thanks to their ultrahigh theoretical energy density. However, the poor cycling stability of the Li-O <subscript>2</subscript> system and, overall, important safety issues due to the formation of Li dendrites, combined with the use of organic liquid electrolytes and O <subscript>2</subscript> cross-over, inhibit their practical applications. As a solution to these various issues, we propose a composite gel polymer electrolyte consisting of a highly cross-linked polymer matrix, containing a dextrin-based nanosponge and activated with a liquid electrolyte. The polymer matrix, easily obtained by thermally activated one pot free radical polymerization in bulk, allows to limit dendrite nucleation and growth thanks to its cross-linked structure. At the same time, the nanosponge limits the O <subscript>2</subscript> cross-over and avoids the formation of crystalline domains in the polymer matrix, which, combined with the liquid electrolyte, allows a good ionic conductivity at room temperature. Such a composite gel polymer electrolyte, tested in a cell containing Li metal as anode and a simple commercial gas diffusion layer, without any catalyst, as cathode demonstrates a full capacity of 5.05 mAh cm <superscript>-2</superscript> as well as improved reversibility upon cycling, compared to a cell containing liquid electrolyte.
Details
- Language :
- English
- ISSN :
- 2073-4360
- Volume :
- 13
- Issue :
- 10
- Database :
- MEDLINE
- Journal :
- Polymers
- Publication Type :
- Academic Journal
- Accession number :
- 34067902
- Full Text :
- https://doi.org/10.3390/polym13101625