Slurry coating process-based method for preparing thin thermal battery positive electrode and electrolyte combination electrode piece

Abstract

The invention belongs to the field of battery manufacturing, and particularly relates to a slurry coating process-based method for preparing a thin thermal battery positive electrode and electrolyte combination electrode piece. The method comprises the steps: preparing homogeneous thermal battery positive electrode slurry, then coating a conducting substrate with the homogeneous thermal battery positive electrode slurry, drying, solidifying and pressing to obtain a thin thermal battery positive electrode piece; and preparing homogeneous thermal battery fused salt electrolyte slurry, coating the thin thermal battery positive electrode piece with the homogeneous thermal battery fused salt electrolyte slurry in a lamination manner, drying, solidifying and pressing so as to obtain the thin thermal battery positive electrode and electrolyte combination electrode piece. The thin thermal battery positive electrode and electrolyte combination electrode piece prepared by adopting the method has the advantages that the thickness can be reduced by 1 / 3-1 / 2 and is adjustable in the range of tens of micrometers to hundreds of micrometers, and the combination electrode piece has very high values on creating a new way in miniaturizing and thinning thermal batteries and promoting development of national defense industries.

Description

technical field [0001] The invention belongs to the field of battery manufacturing, and in particular relates to a method for preparing a thin thermal battery cathode and an electrolyte combined pole piece based on a slurry coating method. Background technique [0002] The thermal battery is a primary reserve battery, which has the advantages of high power, large output current, long storage time and good environmental adaptability. It is the most widely used reserve battery in military equipment and the largest amount of equipment; Preparation by powder pressing process, that is: evenly spread the electrode powder material on the conductive substrate, and then apply pressure to shape; due to the poor self-supporting property of the powder, it is difficult to make a combined pole piece, even if it can be made, the combined pole piece The sheet cannot be made very thin, and the combined electrode sheet with large diameter cannot be formed. These problems have become the bottl...

AI Technical Summary

Problems solved by technology

This method uses an insoluble electrolyte to prepare an emulsion, and forms a diaphragm layer by suction filtration. It is not a coating molding technology in essence, and the process is relatively complicated.

Moreover, the electrolyte emulsion prepared by this method is not high in composition uniformity, and it is easy to cause uneven coating during suction filtration molding, and the coating cannot be made very thin, and it is difficult to achieve thinning of thermal battery pole pieces

In addition, the electrolyte slurry prepared by this method does not add a binder, so it cannot be directly coated on the positive electrode, and needs to be filtered or transferred to the positive electrode layer, resulting in poor bond strength between the two layers.