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Solid polymer electrolytes based on crosslinkable polyoctahedral silsesquioxanes (POSS) for room temperature lithium polymer batteries |
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| Authors: | Jun Young Lee Yong Min Lee Bhaskar Bhattacharya Young-Chang Nho Jung-Ki Park |
| Institution: | 1. Department of Chemical and Biomolecular Engineering (BK21 Graduate Program), Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon, 305-701, Republic of Korea 2. Department of Applied Chemistry, Hanbat National University, San 16-1, Deokmyeong-dong, Yuseong-gu, Daejeon, 305-719, Republic of Korea 3. Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute (KAERI), 1266, Sinjeong-dong, Jeongeup-si, Jeollabuk-do, 580-185, Republic of Korea |
| Abstract: | Solid polymer electrolytes (SPE), based on polyoctahedral silsesquioxanes (POSS) as a crosslinking agent, were prepared by radical polymerization. The ionic conductivity is greatly enhanced by introduction of crosslinkable POSS with multifunctional groups. The SPE prepared with 5 wt.% crosslinking agent shows an ionic conductivity of 5.3?×?10?4 S cm?1 at room temperature. The content of nonvolatile plasticizer, poly(ethylene glycol) dimethyl ether, in the SPE, could be raised to 95 wt.% without any leakage. The SPE is found to be electrochemically stable up to 5.3 V. Lithium polymer cell consisting of Li/SPE/LiCoO2 exhibits 80% of initial discharge capacity even at the rate of 0.1 C at room temperature after 20 cycles, which is a substantial improvement for practical consideration of lithium polymer batteries at room temperature. |
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