The invention discloses a negative plate and a preparation method thereof, an electrochemical device and a vehicle, the negative plate comprises a negative current collector and first to nth negative active layers coated on the negative current collector from inside to outside in sequence, and n is greater than or equal to 2; negative electrode active materials of the first negative electrode active layer to the nth negative electrode active layer comprise a silicon-based active material and graphite; on the basis of the total mass of the silicon-based active materials and the graphite in the corresponding negative electrode active layers, the contents of the silicon-based active materials in the first negative electrode active layer to the nth negative electrode active layer are sequentially distributed in a gradient manner. According to the negative plate, the charging speed is increased while the energy density is increased by utilizing the gradient distribution of the contents of the negative active substances in the different negative active layers.

    一种负极片及其制备方法、电化学装置和车辆,负极片包括负极集流体及在负极集流体上由内向外依次涂覆设置的第1~n层负极活性层,n≥2;第1~n层负极活性层的负极活性物质包括硅基活性材料和石墨;且以相应负极活性层中硅基活性材料和石墨的总质量为基础计,第1~n层负极活性层中所述硅基活性材料的含量依次呈梯度分布。该负极片,利用不同负极活性层中负极活性物质含量的梯度分布,提升能量密度的同时提升充电速度。


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    Title :

    Negative plate and preparation method thereof, electrochemical device and vehicle


    Additional title:

    负极片及其制备方法、电化学装置和车辆


    Contributors:

    Publication date :

    2023-09-29


    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 / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES




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