Realization of high performance polycarbonate-based Li polymer batteries |
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| Affiliation: | 1. Department of Chemistry – Ångström Laboratory, Uppsala University, Box 538, 75121 Uppsala, Sweden;2. School of Materials Science and Engineering, Center for Nano Energy Materials, Northwestern Polytechnical University, Youyi West Road 127, Xi''an, China;1. Graduate school of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo 184-8588, Japan;2. Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Tokyo 152-8522, Japan;3. Department of Chemistry, Sapienza University of Rome, 00185 Rome, Italy;4. Italian Institute of Technology, 16163 Genova, Italy;5. Global Innovation Research Organization, Tokyo University of Agriculture and Technology, Tokyo 184-8588, Japan;1. POLYMAT, University of the Basque Country UPV/EHU, Joxe Mari Korta Centre, Avda. Tolosa 72, 20018 Donostia-San Sebastián, Spain;2. Ikerbasque, Basque Foundation for Science, E-48011 Bilbao, Spain;3. CNRS/ UNIV PAU & PAYS ADOUR, INSTITUT DES SCIENCES ANALYTIQUES ET DE PHYSICO-CHIMIE POUR L''ENVIRONNEMENT ET LES MATERIAUX, UMR5254, 64000, PAU, France;4. CIC Energigune, Alava Technology Park, Albert Einstein 4801510, MIÑANO Álava, Spain;1. Chemistry and Material Engineering Program, Nagasaki University, 1-14, Bunkyo-Machi, Nagasaki City, Nagasaki, 852-8521, Japan;2. Department of Applied Chemistry, Kanagawa Institute of Technology, 1030, Shimo-ogino, Atsugi, Kanagawa, 243-0292, Japan |
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| Abstract: | This work describes effective approaches to achieve high cell performance of solid-state Li polymer batteries based on high-molecular-weight poly(trimethylene carbonate) (PTMC). The origin of a gradual capacity increase observed during passive storage and/or active cycling in LiFePO4|PTMCxLiTFSI|Li cells was investigated by SEM/EDX, indicating an obvious penetration of the polymer electrolyte through the porous composite electrode at elevated temperatures. Refining the interfacial contacts at the electrode/electrolyte interface by adding PTMC oligomer as an interfacial mediator led to significant capacity enhancement already during initial cycles. Optimized cell performance was achieved through this method rather than other approaches, such as casting electrolyte directly onto the electrode and using a polyether oligomer. Successful long-term cycling stability and rate capability tests also resulted from the suggested strategy. |
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