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    • 6. 发明授权
    • Electrolyte for a lithium secondary battery
    • 锂二次电池电解液
    • US06432587B1
    • 2002-08-13
    • US09629990
    • 2000-08-01
    • Jin-Uk LeeJoon-Hwan Lee
    • Jin-Uk LeeJoon-Hwan Lee
    • H01M616
    • H01M10/052H01M6/168H01M10/0525H01M10/0567H01M10/4235
    • An electrolyte for a lithium secondary battery is prepared by injecting a gas additive having a higher reduction potential than a non-aqueous organic solvent into the non-aqueous organic solvent. The gas additive has a reduction potential ranging from 0.5 to 3.5 V based on the Li+ ions. Examples of gas additives include SO2, CO2, and N2O. In a secondary battery using the electrolyte to which the gas additive is not added, the non-aqueous organic solvent itself reacts with lithium ions at the beginning of the battery charging to form a solid electrolyte interface film and produces gases inside the battery, thereby increasing the internal pressure of the battery. However, in the electrolyte containing the gas additive of the present invention, the gas additive reacts with the lithium ions dissolved in the electrolyte to form a solid electrolyte interface film without producing gases that would increase the internal pressure of the battery. An electrolyte containing a gas additive prevents the production of gases, which increases the internal pressure of the battery and thus prevents the modification of the appearance of the battery. In addition, a lithium secondary battery prepared in accordance with the present invention has excellent discharge properties, cycle life and stability.
    • 通过将具有比非水有机溶剂的还原电位高的气体添加剂注入到非水有机溶剂中来制备用于锂二次电池的电解质。 气体添加剂具有基于Li +离子的0.5至3.5V的还原电位。 气体添加剂的实例包括SO 2,CO 2和N 2 O。 在使用不添加气体添加剂的电解质的二次电池中,非水有机溶剂本身在电池充电开始时与锂离子反应形成固体电解质界面膜,并在电池内产生气体,从而增加 电池的内部压力。 然而,在含有本发明的气体添加剂的电解质中,气体添加剂与溶解在电解质中的锂离子反应形成固体电解质界面膜,而不产生将增加电池内部压力的气体。 包含气体添加剂的电解液防止气体的产生,这增加了电池的内部压力,从而防止了电池外观的改变。 此外,根据本发明制备的锂二次电池具有优异的放电性能,循环寿命和稳定性。