High ionic conductivity solid electrolyte and preparation method thereof as well as application of high ionic conductivity solid electrolyte in all-solid-state lithium ion battery

Abstract

The invention discloses application of a high ionic conductivity solid electrolyte layer in an all-solid-state lithium ion battery. An assembling step of the battery comprises the following steps: cutting a composite positive electrode and a composite negative electrode which are coated with films, uniformly coating the composite positive electrode or the composite negative electrode with electrolyte slurry, laminating the composite positive electrode and the composite negative electrode, drying the electrodes by blast air, then drying the electrodes in vacuum, baking the electrodes, welding tabs, performing vacuum packaging and cold-thermal pressing to realize close connection between electrolyte layers, and completing preparation of the all-solid-state lithium ion battery. The application has the advantages that the surfaces of the composite positive and negative electrodes are coated with the high ionic conductivity solid electrolyte layer and then are dried and sliced, and the surface of the cut composite positive electrode or composite negative electrode is uniformly coated with the electrolyte layer; before baking, the positive and negative electrodes are assembled, then dried by the blast air and assembled into the battery; and by twice coating of the electrolyte slurry, the problem of a micro short circuit of the full-solid-state battery and the problem of a relativelyhigh interface impedance between the electrolyte and composite positive and negative pole pieces as well as between one electrolyte layer and the other electrolyte layer can be effectively solved.

Description

Technical field [0001] The invention relates to the field of lithium ion batteries, to a high ion conductivity solid electrolyte, to designing a preparation method for the high ion conductivity solid electrolyte, and to the use of a high ion conductivity solid electrolyte in an all-solid lithium ion battery. application. Background technique [0002] Lithium-ion batteries are widely used as an energy storage device in the digital field because of their high operating voltage, high energy density, non-toxic and non-polluting to the environment. Due to the rapid development of pure electric vehicles and hybrid electric vehicles, there are higher requirements for lithium-ion battery energy density and safety. [0003] The electrolyte used in lithium-ion batteries currently widely used in the market is organic liquid electrolyte, which also brings a series of problems. At present, the amount of liquid electrolyte used in liquid lithium-ion batteries is difficult to reduce, whi...

AI Technical Summary

Problems solved by technology

However, the disadvantage of solid-state batteries is that the interface impedance between the solid-state electrolyte and the positive and negative electrodes is relatively large, resulting in a large overall internal resistance of the battery and slow charging speed, which leads to the fact that solid-state batteries do not have much competitive advantage in the market

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