Gel-state electrode and preparation method thereof

Abstract

The invention discloses a gel-state electrode and a preparation method thereof. The electrode comprises an electrode active material, a conductive agent, SN, a lithium salt, a polymer and an additive. The preparation method comprises the following steps of dissolving the lithium salt and the additive in SN at 60-80 DEG C, adding the polymer, and fully stirring and dissolving to form a gel-state substance, and then, mixing the prepared gel-state substance, an electrode active material and a conductive agent, stirring or uniformly grinding, and coating one side of a solid electrolyte with the mixture to serve as the gel-state electrode of the solid-state battery. According to the type of the added polymer, whether cross-linking treatment is carried out or not is determined. The lithium salt can be completely dissolved in SN to form a plastic crystal electrolyte, and the selected polymer can also be dissolved in the plastic crystal electrolyte. According to the gel-state electrode provided by the invention, the contact performance between the electrode and the solid electrolyte can be improved, the ion transmission in the electrode can be improved, and the negative effect on the battery performance caused by the volume change generated in the charging and discharging process of the electrode active material can also be inhibited.

Description

technical field [0001] The invention relates to the technical field of electrochemistry and new energy materials, in particular to a gel state electrode and a preparation method thereof. Background technique [0002] At present, among various commercial batteries, lithium-ion batteries have the highest energy density and are widely used in various electronic devices. The rapid development of electric vehicles and large-scale energy storage systems has placed higher requirements on the energy density and safety of lithium-ion batteries. However, traditional lithium-ion batteries use organic electrolytes, which have safety risks of leakage, combustion or even explosion, and the electrochemical window is narrow. When lithium metal is used as the negative electrode, lithium dendrites are serious. These problems limit the development of lithium-ion batteries. improved safety and energy density. [0003] Solid electrolytes have a wide electrochemical window, are non-flammable, h...

AI Technical Summary

Problems solved by technology

Although these methods have a certain effect on promoting the ion transport inside the electrode, due to the solid-solid contact characteristics of the solid electrolyte particles and the active material particles, the ion transport speed inside the electrode is still not ideal, and the prepared composite electrode is in a solid form. , not only cannot effectively suppress the volume change of the electrode, but also is not conducive to the interfacial contact between the electrode and the solid electrolyte

In addition, the preparation of electrodes currently requires the use of a large amount of organic solvents, which not only pollutes the environment and increases the cost of raw materials, but also increases the production time and reduces production efficiency due to the drying of the solvents.

Images