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    • 4. 发明申请
    • ELECTROLYTIC SOLUTION
    • 电解液
    • US20110008681A1
    • 2011-01-13
    • US12677397
    • 2008-09-12
    • Meiten KohHitomi NakazawaHideo SakataMichiru TanakaAkiyoshi YamauchiAoi Nakazono
    • Meiten KohHitomi NakazawaHideo SakataMichiru TanakaAkiyoshi YamauchiAoi Nakazono
    • H01M10/05
    • H01M10/0525H01G9/038H01G11/58H01G11/60H01G11/64H01M6/164H01M10/0568H01M10/0569H01M2300/0025H01M2300/0034H01M2300/004H01M2300/0042Y02E60/13Y02T10/7011Y02T10/7022
    • There is provided an electrolytic solution causing no phase separation even at low temperatures, being excellent in flame retardancy and noncombustibility, assuring high solubility of an electrolyte salt, having a high discharge capacity, being excellent in charge-discharge cycle characteristics and being suitable for electrochemical devices such as lithium ion secondary batteries. The electrolytic solution comprises a solvent (I) for dissolving an electrolyte salt comprising a fluorine-containing ether (A) represented by the formula: Rf1—O—Rf2 (Rf1 and Rf2 are the same or different, Rf1 is a fluorine-containing alkyl group having 3 to 6 carbon atoms, Rf2 is a fluorine-containing alkyl group having 2 to 6 carbon atoms), at least one fluorine-containing solvent (B) selected from the group consisting of a fluorine-containing cyclic carbonate (B1) and a fluorine-containing lactone (B2), and at least one non-fluorine-containing carbonate (C) selected from the group consisting of (C1) a non-fluorine-containing cyclic carbonate and (C2) a non-fluorine-containing chain carbonate, and an electrolyte salt (II), and the solvent (I) for dissolving an electrolyte salt comprises 20 to 60% by volume of the fluorine-containing ether (A), 0.5 to 30% by volume of the fluorine-containing solvent (B), and 5 to 40% by volume of the non-fluorine-containing cyclic carbonate (C1) and/or 10 to 74.5% by volume of the non-fluorine-containing chain carbonate (C2) based on the whole solvent (I).
    • 提供即使在低温下也不会产生相分离的电解液,阻燃性和不燃性优异,确保电解质盐的高溶解度,具有高放电容量,充放电循环特性优异,适用于电化学 设备如锂离子二次电池。 电解液包含用于溶解包含下式所示的含氟醚(A)的电解质盐的溶剂(I):Rf1-O-Rf2(Rf1和Rf2相同或不同,Rf1是含氟烷基 具有3至6个碳原子的基团,Rf 2是具有2至6个碳原子的含氟烷基),至少一种选自以下的含氟溶剂(B):含氟环状碳酸酯(B1)和 含氟内酯(B2)和至少一种选自(C1)非氟类环状碳酸酯和(C2)非氟系链中的非氟碳酸酯(C) 碳酸酯和电解质盐(II),溶解电解质盐的溶剂(I)含有20〜60体积%的含氟醚(A),0.5〜30体积%的含氟溶剂 (B)和5〜40体积%的无氟环状碳酸酯(C1)a nd /或10〜74.5体积%的无氟链状碳酸酯(C2)。