Method for manufacturing liquid graphene ink by recycling negative electrode materials from discarded lithium series batteries

Abstract

This invention involves dismantling waste lithium batteries, crushing them manually or mechanically, and then obtaining the internal negative electrode material through washing, dehydration, drying, and sieving. This negative electrode material is essentially ordinary carbon powder, mostly artificial graphite with a carbon content of over 99%. It then undergoes sintering, NMP ultrasonic cleaning, wet grinding, and ink blending. Compared to traditional methods, this process does not require a large amount of energy to obtain single-layer and multi-layer graphene products. This processing reduces the particle size of the graphene to between 1µm (single micrometer) and 0.01µm (nanometer), forming hydrophilic graphene ink. The resulting product is used for screen printing products such as plastic bags. The present invention is to disassemble the waste lithium battery, remove the artificial or mechanical crushing, and then wash, dehydrate, dry and sieve to obtain the internal negative electrode material. These negative electrode materials are general carbon powder, which is mostly Artificial graphite, with a carbon content of more than 99%, is then sintered, NMP ultrasonic cleaned, wet ground, and blended with ink. Compared with traditional processes, this process does not require a lot of energy to obtain a single layer. This process will reduce the particle size of graphene to between 1um (single micron) and 0.01um (nanometer), forming a hydrophilic graphene ink. The products produced are used for printing screen printing products such as plastic bags.

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