Preparation method of improved room temperature electron ion fast transfer electrode slice for solid-state secondary lithium battery

Abstract

The invention discloses a preparation method of an improved room temperature electron ion fast transfer electrode slicefor a solid-state secondary lithium battery. The method comprises the following steps: (1) evenly mixing an active material, a conductive agent and a fast ion conductor according to a certain proportion; (2) adding a certain amount of a binder into the mixture, and mixing uniformly to obtain a uniform slurry; and (3) preparing the slurry into slices, and drying to obtain the required electrode slice. The preparation method of the electrode slice preparation uses the fast ion conductor material with high temperature high lithium ion conductivity; the material can play the role of increasing the contact area between the active particles and solid electrolyte, and he form a three-dimensional electron and lithium ion transport network, so as to ensure the rapid conduction of the electrons in the electrode also improve the transmission rate of lithium ions between the active particles and electrolyte. Therefore, the preparation method is beneficial to reducing the interface impedance among the active particles in the electrode slice and between the active particles and the solid electrolyte, thereby increasing the power rate performance of the solid-state secondary lithium battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery preparation, in particular to an all-solid secondary lithium battery. Background technique [0002] With the gradual breakthrough of key technologies of lithium-ion batteries, the application fields of lithium-ion batteries have developed from portable electronic products to electric vehicles and energy storage grids. At the same time, people are paying more attention to the safety of lithium-ion batteries. because [0003] Therefore, while improving the energy density and power density of lithium-ion batteries, the safety issue has become a key issue that needs to be solved urgently. [0004] one of the questions. [0005] At present, commercial lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators, and electrolytes. Among them, the electrolyte can be divided into two types according to the different forms of existence: liquid electrolyt...

AI Technical Summary

Problems solved by technology

However, the polymer electrolyte is easy to form a porous structure after being added to the electrode sheet, resulting in a longer and more tortuous average migration path of lithium ions in the electrode sheet, which is not conducive to reducing the transmission time of lithium ions in the electrode sheet, and compared to inorganic Solid electrolyte materials, polymer electrolytes have low room temperature lithium ion conductivity

After the electrode sheet is treated with sulfide sublimation, the sulfide fills the solid-solid particle gap to act as a connecting bridge, which improves the contact area between the solid-solid particles and improves the electrical conductivity. However, the method is complicated and requires pressing Good pole pieces and sulfides are sealed in a vacuum tube for high temperature treatment and then cold-pressed and dried with the current collector. Such a harsh and complicated process is difficult to promote and use in industrial production.

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