The invention discloses lithium ion battery positive electrode slurry and a preparation method and application thereof. The slurry comprises a positive electrode active material, a conductive agent, abinder, metaphosphate and an organic solvent. Based on the total mass of the positive electrode active material, the conductive agent, the binder and the metaphosphate, the content of the metaphosphate is 0.5%-1.9%. The metaphosphate is added into the positive electrode slurry, and the metaphosphate is directly coated on the surface of the positive electrode active material during dispersion, sothat the electronic conductivity of the metaphosphate can be enhanced, the first coulombic efficiency and gram volume of the battery can be improved, the contact area of the positive electrode activematerial and an electrolyte can be reduced, and side reactions can be reduced; and in addition, the metaphosphate is weakly acidic, and can neutralize residual alkali on the surface of the positive electrode active material under a certain voltage.

    本发明公开了锂离子电池正极浆料及其制备方法和应用,所述浆料包括:正极活性材料、导电剂、粘结剂、偏磷酸盐和有机溶剂;基于所述正极活性材料、导电剂、粘结剂和偏磷酸盐的总质量,所述偏磷酸盐的含量为0.5%‑1.9%。将偏磷酸盐添加到正极浆料当中,偏磷酸盐在分散时直接包裹在正极活性物质表面,不仅可以增强其电子电导率,提高电池的首次库伦效率和克容量,还可以减少正极活性物质和电解液的接触面积,减少副反应的发生,此外,偏磷酸盐呈弱酸性,在一定的电压下,可以中和正极活性物质表面的残碱。


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    Title :

    Lithium ion battery positive electrode slurry and preparation method and application thereof


    Additional title:

    锂离子电池正极浆料及其制备方法和应用


    Contributors:
    ZHU QING (author) / LIU YONGFEI (author)

    Publication date :

    2020-12-04


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    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 / B82Y Bestimmter Gebrauch oder bestimmte Anwendung von Nanostrukturen , SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES



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