Preparation method of solid-state battery

Abstract

The invention discloses a preparation method of a solid-state battery, which comprises the steps of solid-state membrane preparation, positive electrode slurry preparation, positive / negative electrode piece manufacturing, battery assembly, heat treatment of an electrode group, and negative pressure packaging and testing, the positive electrode is a ternary nickel cobalt lithium manganate material, and the negative electrode is a lithium piece. The preparation of the solid-state battery is realized through the steps of solid-state membrane preparation, positive electrode slurry preparation, positive / negative electrode piece manufacturing, battery assembly, electrode group heat treatment, negative pressure packaging and testing, the composite membrane in the prepared solid-state battery has excellent compatibility with lithium metal, and the composite membrane can completely improve the cycling stability of the battery; the battery capacity is 3.5 Ah (60 DEG C), the mass energy density is greater than 300Wh / kg, the volume energy density is greater than 700Wh / L, and no flatulence exists; and puncture explosion is avoided.

Description

technical field [0001] The invention relates to the technical field of solid-state batteries, in particular to a preparation method of a solid-state battery. Background technique [0002] Solid-state batteries can be used in aircraft, intelligent robots, electric bicycles, electric vehicles, and energy storage systems. [0003] Most of the products on the market mainly include: [0004] The first traditional lithium battery - the cell is easy to deform, has poor consistency, and flatulence; [0005] The solid-state battery of the second composite solid-state ceramic membrane is fragile, and the interface transmission rate is low; [0006] Safety issues related to liquid electrolytes and inherent dendrite growth during Li plating / stripping have hindered the practical application of Li metal batteries. Therefore, advanced solid-state Li metal batteries offer great potential for developing highly safe batteries. However, It is still challenging to fabricate practically usabl...

AI Technical Summary

Problems solved by technology

[0004] The first type of traditional lithium battery-battery cells are easily deformed, poor in consistency, and flatulent;

[0005] The second type of solid-state battery with composite solid-state ceramic membrane is fragile and has low interfacial transmission rate;

[0006] Safety concerns associated with liquid electrolytes and inherent dendrite growth during Li plating / stripping hinder the practical application of Li metal batteries, thus, advanced solid-state Li metal batteries offer great potential for the development of highly safe batteries, however, At present, it is still challenging to fabricate practical solid-state polymer electrolyte membranes with a thickness less than tens of micrometers, high mechanical strength and ionic conductivity. To this end, we propose a method for the preparation of solid-state batteries

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