forsyth-polymerizedionic-2020.pdf (991.3 kB)
Polymerized Ionic Liquid Block Copolymer Electrolytes for All-Solid-State Lithium-Metal Batteries
journal contribution
posted on 2020-01-01, 00:00 authored by T C Mendes, Nicolas Goujon, N Malic, A Postma, J Chiefari, Haijin Zhu, Patrick HowlettPatrick Howlett, Maria ForsythMaria Forsyth© 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited. In this work, we present a polymerized ionic liquid block copolymer (PBCP) film where relevant properties such as ionic conductivity and electrochemical parameters are tailored by using a ternary system comprised of poly(styrene-b-1-((2-acryloyloxy)ethyl)-3-butylimidazolium bis(tri-fluoromethanesulfonyl)imide), LiFSI salt and ethylene carbonate (EC) as a cosolvent. It was found that EC efficiently decreases the glass transition temperature of the ionic block, resulting in an improved ionic conductivity and efficient platting/stripping of lithium. By using an optimal ratio of EC/LiFSI at relatively high LiFSI amount, Li|Li symmetrical cells at 50 °C show an overpotential as low as 70 mV at 0.1 mA.cm-2 along with a high lithium transport number of 0.56 (tLi+). All-solid-state full cells based on lithium iron phosphate cathode paired with a lithium metal anode reveal a rather stable cycling at both 50 °C and 70 °C. A negligible capacity fading is observed up to 30 cycles where a specific capacity as high as 161 mAh.g-1 is achieved with a coulombic efficiency of 99.9%. Thus, this work demonstrates an important pathway for tailoring the properties of solid state polymer electrolytes for emerging and specially designed block copolymer architectures comprising domains that give both excellent ionic conduction along with desirable mechanical properties.
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Journal
Journal of the Electrochemical SocietyVolume
167Issue
7Article number
070525Pagination
1 - 9Publisher
The Electrochemical SocietyLocation
Pennington, N.J.Publisher DOI
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0013-4651eISSN
1945-7111Publication classification
C1 Refereed article in a scholarly journalUsage metrics
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