4.8 Article

Stable Na Electrodeposition Enabled by Agarose-Based Water-Soluble Sodium Ion Battery Separators

期刊

ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 18, 页码 21250-21260

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c02135

关键词

agarose; degradability; sodium ion battery (NIB); sodium plating/stripping; battery life span; circular economy

资金

  1. ETH Zurich (ETH Research Grant) [ETH-45 18-1]
  2. University of Basque Country (UPV/EHU)

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By utilizing marine biopolymer and water-soluble polymer, a novel sodium ion battery separator with improved thermal stability, electrolyte wettability, and Na+ conductivity has been developed. This advancement opens up new possibilities for reducing the environmental impacts of uncontrolled accumulation of electronic waste in marine or land environments.
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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