Quasi-solid-state battery pole piece and preparation method and application thereof

Abstract

The invention discloses a quasi-solid-state battery pole piece as well as a preparation method and application thereof; and the preparation method comprises the following steps: (1), mixing and sintering an electrode active material and a first powder material so as to enable the first powder material to form a coating layer on the surface of the electrode active material; (2), mixing the productobtained in the (1) with a second powder material, a conductive agent, a first binder and a first solvent to obtain first slurry; (3), coating a current collector with the first slurry, and performingrolling to obtain an initial pole piece; (4), mixing a third powder material, a second binder and a second solvent to obtain a second slurry; and (5), coating at least part of the surface of the initial pole piece with the second slurry to obtain a quasi-solid-state battery pole piece. According to the quasi-solid-state battery pole piece, on the premise of not reducing the rate capability of thebattery, problems of volume expansion / shrinkage, electrolyte wettability, lithium dendritic crystal growth inhibition, electrode interface side reaction and the like in the charging and discharging process of a battery cell are effectively avoided.

Description

Technical field[0001]The invention belongs to the technical field of quasi-solid battery, and specifically relates to a quasi-solid battery pole piece and a preparation method and application thereof.Background technique[0002]With the global wave of new energy electric vehicles sweeping, their sales have increased year by year, but with that comes an increase in safety accidents, and safety issues have become increasingly prominent. Combustible liquid organic electrolyte is the main cause of battery spontaneous combustion. Therefore, among the various new battery systems, solid-state batteries are the most promising alternative to the current liquid lithium batteries, which has become the consensus of the industry and the scientific community. The solid-state battery uses a non-flammable solid electrolyte to replace the flammable organic liquid electrolyte. Because the solid electrolyte has the advantages of non-flammable, non-corrosive, non-volatile, and no leakage, it is more stab...

AI Technical Summary

Problems solved by technology

However, problems such as high interface impedance of solid electrolyte, low material ionic conductivity, poor rate performance, poor cycle stability and compatibility in solid-state batteries have not been effectively solved, so there is no effective way to solve the above problems in the short term. In this case, a compromise solution is needed to solve the above problems

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