Alkylphosphate-based nonflammable gel electrolyte for LiMn(2)O(4) positive electrode in lithium-ion battery

作者：Yoshimoto Nobuko; Gotoh Daisuke; Egashira Minato; Morita Masayuki^*

来源：Journal of Power Sources, 2008, 185(2): 1425-1428.

DOI：10.1016/j.jpowsour.2008.09.002

• Li-ion battery
• Polymeric gel electrolyte
• Nonflammability
• LiMn(2)O(4) positive electrode

Polymeric gel containing alkylphosphate has been examined as nonflammable gel electrolyte for LiMn(2)O(4) positive electrode of lithium-ion battery (LIB). The gel was composed of a polymer matrix of poly(vinylidenefluoride-co-hexafluoropropylene) (PVdF-HFP) and a liquid component consisting of ternary solvent of trimethyl phosphate (TMP) mixed with ethylene carbonate (EC) and diethyl carbonate (DEC) that dissolves lithium salt (LiPF(6) or LiBF(4)). The gel composition of 0.8 M (mol dm(-3)) LiX (X = PF(6), and BF(4)) dissolved in EC+ DEC+TMP (55:25:20) with PVdF-HFP showed excellent nonflammable characteristics and high ionic conductivity of ca. 3.1 niScm(-1) at room temperature (20 degrees C). The charge-discharge cycling test of LiMn(2)O(4) positive electrode gave good reversibility with high capacitance in the gel electrolyte. With respect to the electrolyte salt. LiBF(4) was better than LiPF(6) due to its thermal stability during the get preparation.

• 出版日期2008-12-1