High Toughness Inorganic Solid Electrolytes via the Use of Reduced Graphene-Oxide
26 Pages Posted: 14 Jan 2020 Sneak Peek Status: Review CompleteMore...
Ceramic solid electrolytes are important emerging materials that have the potential to enable the safe use of Li metal anodes. However, they suffer from inherently low fracture toughness which significantly limits battery performance and reliability. While small electrolyte dimensions are generally needed for faster ion transport, these length scales also restrict the approaches that can be used to engineer higher fracture resistance. Inspired by the toughening that reduced graphene oxide provides to polymer and engineering ceramics, this approach is explored as a means to enhance the toughness of an oxide-based lithium ion conductor. An average KIc enhancement of 120% is demonstrated without altering the ionic and electronic behavior of the material. To our knowledge this is the toughest ceramic solid electrolyte reported to date. Based on these results, an analytical framework is developed to provide guidelines for designing ultra-tough solid electrolytes using 2D materials.
Keywords: solid state batteries, inorganic ceramic electrolytes, nanocomposites, graphene, fracture toughness
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