Non-flammable electrolyte containing liquefied gas and lithium secondary batteries containing same
申请人:Nanotek Instruments, Inc.
公开号:US11258101B2
公开(公告)日:2022-02-22
A rechargeable lithium cell comprising a cathode, an anode, an optional ion-permeable membrane disposed between the anode and the cathode, a non-flammable salt-retained liquefied gas electrolyte in contact with the cathode and the anode, wherein the electrolyte contains a lithium salt dissolved in or mixed with a liquefied gas solvent having a lithium salt concentration greater than 1.0 M so that the electrolyte exhibits a vapor pressure less than 1 kPa when measured at 20° C., a vapor pressure less than 60% of the vapor pressure of the liquefied gas solvent alone, a flash point at least 20 degrees Celsius higher than a flash point of the liquefied gas solvent alone, a flash point higher than 150° C., or no flash point, wherein the liquefied gas solvent is selected from methane, fluoromethane, difluoromethane, chloromethane, dichloromethane, ethane, fluoroethane, difluoroethane, tetrafluoroethane, chloroethane, dichloroethane, tetrachloroethane, propane, fluoropropane, chloropropane, ethylene, fluoroethylene, chloroethylene, or a combination thereof.
一种可充电锂电池,包括阴极、阳极、设置在阳极和阴极之间的任选离子渗透膜、与阴极和阳极接触的不易燃的含盐液化气电解液,其中电解液包含溶解在锂盐浓度大于 1.0 M 的液化气溶剂中或与之混合的锂盐,使电解液在 20 摄氏度时的蒸气压小于 1 千帕、蒸气压小于单独液化气溶剂蒸气压的 60%,闪点比单独液化气溶剂的闪点至少高 20 摄氏度,闪点高于 150 摄氏度、或无闪点,其中液化气溶剂选自甲烷、氟甲烷、二氟甲烷、氯甲烷、二氯甲烷、乙烷、氟乙烷、二氟乙烷、四氟乙烷、氯乙烷、二氯乙烷、四氯乙烷、丙烷、氟丙烷、氯丙烷、乙烯、氟乙烯、氯乙烯或它们的组合。