Recycling supercapacitors based on shredding and mild thermal treatment

摘要

Supercapacitors are widely used in electric and hybrid vehicles, wind farm and low-power equipment due to their high specific power density and huge number of charge-discharge cycles. Waste supercapacitors should be recycled according to EU directive 2002/96/EC on waste electric and electronic equipment This paper describes a recycling approach for end-of-life supercapacitors based on shredding and mild thermal treatment. At first supercapacitors are shredded using a Retsch cutting mill. The shredded mixture is then undergone thermal treatment at 200 ℃ to recycle the organic solvent contained in the activated carbon electrodes. After the thermal treatment, the mixture is roughly separated using a fluidized bed method to remove the aluminium foil particles and paper particles from the activated carbon particles, which is subsequently put into water for a wet shredding into fine particles that can be re-used. The recycled activated carbon has a BET surface area of up to 1200 m~2/g and the recycled acetonitrile has a high purity.