Nonflammable gel electrolyte containing alkyl phosphate for rechargeable lithium batteries
Nonflammable gel electrolyte containing alkyl phosphate for rechargeable lithium batteries
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DOI：
10.1016/j.jpowsour.2006.02.090
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发表时间：
2006-12
影响因子：
9.2
通讯作者：
N. Yoshimoto;Y. Niida;M. Egashira;M. Morita
中科院分区：
文献类型：
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作者：
N. Yoshimoto;Y. Niida;M. Egashira;M. Morita
一种不易燃的聚合物凝胶电解质已被开发用于可充电锂电池系统。该凝胶膜由聚（偏氟乙烯-共-六氟丙烯）（PVdF-HFP）组成，其在含有磷酸三甲酯（TMP）的三元溶剂中用六氟磷酸锂（LiPF 6）溶液溶胀。对于由0.8M LiPF 6/EC+DEC+TMP（55：25：20）与PVdF-HFP组成的凝胶电解质，在20°C下获得6.2mScm-1的高离子电导率，这与含有相同电解质盐的液体电解质的离子电导率相当。在凝胶电解质中加入少量碳酸亚乙烯酯（VC）可改善石墨电极的可充电性。石墨在含VC的凝胶中的可充容量约为1000 mAh。300 mAhg-1，这几乎与常规液体电解质系统中的相同。
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 6.2mScm−1at 20°C was obtained for the gel electrolyte consisting of 0.8M 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. 300mAhg−1, which is almost the same as that in a conventional liquid electrolyte system.