Nonflammable gel electrolyte containing alkyl phosphate for rechargeable lithium batteries

作者：Yoshimoto Nobuko^*; Niida Yoshihiro; Egashira Minato; Morita Masayuki

来源：Journal of Power Sources, 2006, 163(1): 238-242.

DOI：10.1016/j.jpowsour.2006.02.090

• 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.

• 出版日期2006-12-7