The invention relates to the technical field of energy storage, and provides an electrolyte and a preparation method thereof.A composite lithium salt is dissolved in an electrolyte solvent, the electrolyte solvent comprises, by volume, 80%-99% of an organic solvent, 1%-5% of a negative electrode additive and 1%-5% of a positive electrode additive, and the volume of the organic solvent accounts for 1%-3% of the volume of the electrolyte solvent. The positive electrode additive accounts for 0.5%-5% of the volume of the electrolyte solvent, and the negative electrode additive accounts for 0.5%-2% of the volume of the electrolyte solvent. Based on the addition of the positive electrode additive and the negative electrode additive with limited volume percentage contents into the electrolyte, the polarization of positive and negative electrode plates in the rapid charging process can be reduced, so that the cycle performance under high charging rate can be improved, the electrolyte has good ionic conductivity, an electrode/electrolyte interface can be stabilized, and the service life of the electrolyte is prolonged. And the cycling stability of the lithium ion battery with the electrolyte is improved. The electric vehicle with the lithium ion battery can also have relatively high safety and operation stability.

    本发明涉及储能技术领域,其提供一种电解液及其制备方法,将复合锂盐溶解于电解液溶剂中,其中,所述电解液溶剂包括有机溶剂、负极添加剂及正极添加剂,有机溶剂占电解液溶剂的体积百分含量为80%‑99%,正极添加剂占电解液溶剂的体积百分含量为0.5%‑5%,负极添加剂占电解液溶剂的体积百分含量为0.5%‑2%。基于在电解液中加入限定体积百分含量的正极添加剂、负极添加剂可以减少正负极片在快速充电过程中极化,从而可提升在高充电倍率下的循环性能,还可使其具有良好的离子导电性,能稳定电极/电解液的界面,提高具有该电解液的锂离子电池的循环稳定性。具有上述锂离子电池的电动车也可具有较高的安全性和运行稳定性。


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    Title :

    Electrolyte and preparation method thereof, lithium ion battery and electric vehicle


    Additional title:

    一种电解液及其制备方法、锂离子电池及电动车


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

    Publication date :

    2022-07-15


    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



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