期刊
JOURNAL OF POWER SOURCES
卷 163, 期 1, 页码 238-242出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2006.02.090
关键词
Li-ion battery; polymeric gel electrolyte; nonflammability; additive
A nonflammable polymeric gel electrolyte has been developed for rechargeable lithium battery systems. The gel film consists of poly (vinylidenefluoride-co-hexafluoropropylene) (PVdF-HFP) swollen with lithium hexafluorophosphate (LiPF6) solution in ternary solvent containing trimethyl phosphate (TMP). High ionic conductivity of 6.2 mS cm(-1) at 20 degrees C was obtained for the gel electrolyte consisting of 0.8 M LiPF6/EC + DEC + TMP (55:25:20) with PVdF-HFP, which is comparable to that of the liquid electrolyte containing the same electrolytic salt. Addition of a small amount of vinylene carbonate (VC) in the gel electrolyte improved the rechargeability of a graphite electrode. The rechargeable capacity of the graphite in the gel containing VC was ca. 300 mAh g(-1), which is almost the same as that in a conventional liquid electrolyte system. (c) 2006 Elsevier B.V. All rights reserved.
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