| 摘要 |
PURPOSE: A composite polymer electrolyte, its preparation method and a lithium secondary battery employing the electrolyte are provided to improve the ion conductivity and the mechanical properties and to reduce the interface resistance. CONSTITUTION: The polymer electrolyte comprises a lithium salt, a room temperature melting salt as a supporting electrolyte of the lithium salt, and a polymer. Preferably the cationic component of the room temperature melting salt is 1-ethyl-3-methylimidazolium of the formula 1 or imidazolium tetrafluoroborate; the anionic component I-, BF4-, ClO4-, CF3SO3-, AsF6-, PF6-, N(CF3SO2)2-, C(CF3SO2)3-, N(C2F5SO2)2- or C4F9SO3-; the lithium salt is selected from the group consisting of LiI, LiBF4, LiClO4, LiCF3SO3, LIAsF6, LiPF6, LiN(CF3SO2)2, LiC(CF3SO2)3, LiN(C2F5SO2)2 and LiC4F9SO3; and the polymer is selected from the group consisting of poly(ethylene oxide), noncrystalline poly(ethylene oxide), poly(propylene oxide) and poly(vinyl pyrrolidone). Optionally the polymer electrolyte comprises further a ferroelectric material selected from the group consisting of PbTiO3, BaTiO3 and LiNbO3. |
