Prelithium Regeneration of Negative Graphite for Retired Lithium Iron Phosphate Batteries
Pre-lithiation was carried out on the negative electrode graphite of retired lithium iron phosphate(LiFePO4)batteries to transform it into lithium carbon compounds and undergo heat treatment,thereby achie-ving the crystal transformation of graphite.The pre-lithiated LiFePO4 batteries were heat treated,and the recov-ered graphite was treated differently.The resulting sample was mixed with conductive carbon black and binders to form a new electrode.The performance of the battery was tested after assembling the battery,and the results showed that under the condition of a current of 0.1C,the button batteries made from pre-lithiated heat-treated graphite samples after acid leaching had an average discharge specific capacity of 322.3 mAh·g-1,which was much higher than other control groups,and its cycling stability was also stronger than artificial graphite.This proved that retired battery negative electrode graphite could obtain high-quality regenerated graphite after pre-li-thiation,heat treatment and acid leaching treatment.
lithium iron phosphate batterygraphiteprelithizationcrystal transition