https://scholars.lib.ntu.edu.tw/handle/123456789/598251
標題: | Epoxy-based interlocking membranes for all solid-state lithium ion batteries: The effects of amine curing agents on electrochemical properties | 作者: | Yu T.-Y Yeh S.-C Lee J.-Y Wu N.-L NAE-LIH WU RU-JONG JENG |
關鍵字: | All-solid-state lithium ion battery (ASSLIBs);Amino/epoxy;Interlocking bilayer;Solid state electrolyte (SPE);Acrylic monomers;Cathodes;Crosslinking;Crystallinity;Curing;Electrochemical properties;Ionic conduction in solids;Ionic conductivity;Ions;Lithium-ion batteries;Membranes;Polyelectrolytes;Polyethylene glycols;Polyethylenes;Solid-State Batteries;All-solid-state lithium ion batteries;All-solid-state lithium ion battery;Bi-layer;Epoxy;Interlockings;Solid polymer electrolytes;Solid state electrolyte (solid polymer electrolyte);Solid-state electrolyte;Solid electrolytes | 公開日期: | 2021 | 卷: | 13 | 期: | 19 | 來源出版物: | Polymers | 摘要: | In this study, a series of crosslinked membranes were prepared as solid polymer electrolytes (SPEs) for all-solid-state lithium ion batteries (ASSLIBs). An epoxy-containing copolymer (glycidyl methacrylate-co-poly(ethylene glycol) methyl ether methacrylate, PGA) and two amine curing agents, linear Jeffamine ED2003 and hyperbranched polyethyleneimine (PEI), were utilized to prepare SPEs with various crosslinking degrees. The PGA/polyethylene oxide (PEO) blends were cured by ED2003 and PEI to obtain slightly and heavily crosslinked structures, respectively. For further optimizing the interfacial and the electrochemical properties, an interlocking bilayer membrane based on overlapping and subsequent curing of PGA/PEO/ED2003 and PEO/PEI layers was developed. The presence of this amino/epoxy network can inhibit PEO crystallinity and maintain the dimensional stability of membranes. For the slightly crosslinked PGA/PEO/ED2003 membrane, an ionic conductivity of 5.61 × 10?4 S cm?1 and a lithium ion transference number (tLi+) of 0.43 were obtained, along with a specific capacity of 156 mAh g?1 (0.05 C) acquired from an assembled halfcell battery. However, the capacity retention retained only 54% after 100 cycles (0.2 C, 80 °C), possibly because the PEO-based electrolyte was inclined to recrystallize after long term thermal treatment. On the other hand, the highly crosslinked PGA/PEO/PEI membrane exhibited a similar ionic conductivity of 3.44 × 10?4 S cm?1 and a tLi+ of 0.52. Yet, poor interfacial adhesion between the membrane and the cathode brought about a low specific capacity of 48 mAh g?1. For the reinforced interlocking bilayer membrane, an ionic conductivity of 3.24 × 10?4 S cm?1 and a tLi+ of 0.42 could be achieved. Moreover, the capacity retention reached as high as 80% after 100 cycles (0.2 C, 80 °C). This is because the presence of the epoxy-based interlocking bilayer structure can block the pathway of lithium dendrite puncture effectively. We demonstrate that the unique interlocking bilayer structure is capable of offering a new approach to fabricate a robust SPE for ASSLIBs. ? 2021 by the authors. Licensee MDPI, Basel, Switzerland. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85116319331&doi=10.3390%2fpolym13193244&partnerID=40&md5=c0a318c8006dc1b57713bff245c87259 https://scholars.lib.ntu.edu.tw/handle/123456789/598251 |
ISSN: | 20734360 | DOI: | 10.3390/polym13193244 |
顯示於: | 化學工程學系 |
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