Journal
SOLID STATE IONICS
Volume 320, Issue -, Pages 310-315Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2018.03.021
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Funding
- NSF-DMR [1502543]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1502543] Funding Source: National Science Foundation
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The safety issue of a portable battery has increasingly become paramount important because of intimate contact of wearable devices with the human body. In this study, a flame retardant, thermally stable polymer electrolyte membrane (PEM) has been fabricated based on crosslinkable polyurethane precursor, viz., polyethylene glycolbis-carbamate dimethacrylate (PEGBCDMA). This PEGBCDMA based PEM is solvent-free, transparent, bendable, and twistable, which makes it an ideal candidate for a fully flexible battery application with safety attributes. Moreover, the above PEM exhibits high ionic conductivity close to the superionic level (8 x 10(-4) S CM-1 at room temperature) and electrochemical stability in a large operating window of -0.5 V to 4.5 V. The PEM shows over 80% of specific capacity retention up to 250 cycles tested in the lithium iron phosphate (LiFePO4)/PEM/graphite full cells. Of particular importance is that the present PEGBCDMA based PEM has met most of the application criteria for a flexible solid-state lithium ion battery.
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