The invention relates to the technical field of energy storage, and provides a lithium ion battery electrolyte and a preparation method thereof. The preparation method comprises: dissolving a composite lithium salt in an electrolyte solvent, the composite lithium salt comprising a lithium salt additive and lithium hexafluorophosphate, the molar concentration of lithium ions of the composite lithium salt dissolved in the electrolyte solvent being 0.8-2.5 mol/L, the lithium salt additive comprising lithium difluoro (oxalato) borate, and the molar ratio of the lithium difluoro (oxalato) borate to the lithium hexafluorophosphate is 0.05-2. The lithium difluoro (oxalato) borate and the lithium hexafluorophosphate are matched according to a specific molar ratio, so that the composite lithium salt dissolved in the electrolyte solvent has excellent ionic conductivity, and due to the addition of the lithium difluoro (oxalato) borate, the electrolyte has good high-temperature storage and cycle performance; and the safety performance and the anti-overcharge capability of the lithium ion battery can be improved. The invention also provides an electric vehicle which is provided with the lithium ion battery of the electrolyte.

    本发明涉及储能技术领域,其提供一种种锂离子电池电解液及制备方法,其包括将复合锂盐溶解在电解液溶剂中,其中,复合锂盐包括锂盐添加剂和六氟磷酸锂,复合锂盐溶解在电解液溶剂中锂离子的摩尔浓度为0.8‑2.5mol/L,所述锂盐添加剂包括二氟草酸硼酸锂,二氟草酸硼酸锂与六氟磷酸锂的摩尔比为0.05‑2。在本发明中基于二氟草酸硼酸锂与六氟磷酸锂以特定摩尔比配合,可使溶解在电解液溶剂中的复合锂盐具有优良的离子导电率,而且由于二氟草酸硼酸锂的加入,还可使电解液具有良好的高温存储和循环性能,并且能够提高锂离子电池安全性能及抗过充能力。本发明还提供一种电动车,其具有上述电解液的锂离子电池。


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    Titel :

    Lithium ion battery electrolyte and preparation method thereof, lithium ion battery and electric vehicle


    Weitere Titelangaben:

    一种锂离子电池电解液及制备方法、锂离子电池及电动车


    Beteiligte:
    PENG XIAOLI (Autor:in) / XIANG YONG (Autor:in) / LIU SHENGNAN (Autor:in) / WENG SHIJIE (Autor:in) / QIAN CHAO (Autor:in) / WANG XIANMING (Autor:in) / YUE MIN (Autor:in) / SONG YU (Autor:in) / YAN ZONGKAI (Autor:in)

    Erscheinungsdatum :

    2021-06-04


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Chinesisch


    Klassifikation :

    IPC:    H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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