期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 14, 期 8, 页码 1445-1449出版社
SPRINGER
DOI: 10.1007/s10008-009-0968-1
关键词
Solid polymer electrolyte; Crosslinking agent; Ionic conductivity; Electrochemical stability; Lithium polymer batteries
资金
- Ministry of Education, Science and Technology, Republic of Korea
- Korea Science and Engineering Foundation [31-2008-000-10055-0]
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 x 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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