| Title | Stable Na Electrodeposition Enabled by Agarose-Based Water-Soluble Sodium Ion Battery Separators |
|---|---|
| ID_Doc | 21876 |
| Authors | Ojanguren, A; Mittal, N; Lizundia, E; Niederberger, M |
| Title | Stable Na Electrodeposition Enabled by Agarose-Based Water-Soluble Sodium Ion Battery Separators |
| Year | 2021 |
| Published | Acs Applied Materials & Interfaces, 13.0, 18 |
| Abstract | Developing efficient energy storage technologies is at the core of current strategies toward a decarbonized society. Energy storage systems based on renewable, nontoxic, and degradable materials represent a circular economy approach to address the environmental pollution issues associated with conventional batteries, that is, resource depletion and inadequate disposal. Here we tap into that prospect using a marine biopolymer together with a water-soluble polymer to develop sodium ion battery (NIB) separators. Mesoporous membranes comprising agarose, an algae-derived polysaccharide, and poly(vinyl alcohol) are synthesized via nonsolvent-induced phase separation. Obtained membranes outperform conventional non-degradable NIB separators in terms of thermal stability, electrolyte wettability, and Na+ conductivity. Thanks to the good interfacial adhesion with metallic Na promoted by the hydroxyl and ether functional groups of agarose, the separators enable a stable and homogeneous Na deposition with limited dendrite growth. As a result, membranes can operate at 200 mu A cm(-2), in contrast with Celgard and glass microfiber, which short circuit at 50 and 100 mu A cm(-2), respectively. When evaluated in Na3V2(PO4)(3)/Na half-cells, agarose-based separators deliver 108 mA h g(-1) after 50 cycles at C/10, together with a remarkable rate capability. This work opens up new possibilities for the use of water-degradable separators, reducing the environmental burdens arising from the uncontrolled accumulation of electronic waste in marine or land environments. |
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