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Peer reviewed
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Chen, Long; Li, Yutao; Li, Shuai-Peng; Fan, Li-Zhen; Nan, Ce-Wen; Goodenough, John B.
Nano energy, April 2018, 2018-04-00, 2018-04-01, Volume: 46, Issue: CJournal Article
Composite polyethylene-oxide/garnet electrolytes containing LiTFSI as the lithium salt have a Li+ conductivity σLi > 10−4Scm−1 at 55°C and a low plating/stripping impedance of a dendrite-free Li-metal anode; they have been developed for a safe solid-state Li-metal rechargeable battery. Composites consisting of “ceramic-in-polymer” to “polymer-in-ceramic” that are flexible and mechanically robust are fabricated by hot-pressing. Safe pouch cells with a remarkable flexibility have been fabricated. Solid-state LiFePO4|Li batteries with electrolytes of “ceramic-in-polymer” and “polymer-in-ceramic” deliver excellent cycling stability with high discharge capacities (139.1mAhg–1 with capacity retention of 93.6% after 100 cycles) and high capacity retention (103.6% with coulombic efficiency of 100% after 50 cycles) at 0.2C and 55°C. Both kinds of electrolytes can be applied to solid-state lithium batteries. PEO/garnet composite electrolytes from “ceramic-in-polymer” to “polymer-in-ceramic” are prepared by hot-pressing technology without introducing any solvent. The resultant electrolytes exhibit excellent electrochemical properties and the assembled batteries deliver high cycling stability and stable interface with Li anode, demonstrating a promising strategy for a safe, high-performance and solid-state Lithium batteries. Display omitted •PEO/garnet electrolyte has a Li+ conductivity σLi > 10−4Scm−1 at 55°C.•The electrolytes are flexible and mechanically robust.•The membrane has a low plating/stripping impedance.•All-solid-state LiFePO4/Li cell has a discharge capacities of 148.6mAhg−1.
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