Study on Regeneration of Waste LiNi0.5Co0.2Mn0.3O2 Materials by Ball Milling-Spray Method
In order to improve the electrochemical performance of regenerated lithium-ion battery materials,a ball milling-spray method was proposed to recover and regenarate waste LiNi0.5Co0.2 Mn0.3O2(NCM523).This method includes ball milling and refinement for the pretreated waste cathode material,rapid prepara-tion of the precursor of the regenerated material through spray drying,and high temperature calcination to preduce the regenerated NCM523 material.The morphology,component,phase and chemical change of the materials during the regeneration process were analyzed by SEM,EDS,XRD,HRTEM,FT-IR,XPS and TG-DSC,and the electrochemical properties of the batteries assembled with regenerated NCM523 were also analyzed.The results show that the regenerated material has a porous structure,and the degree of lithium-nickel mixing is reduced,resulting in improved electrochemical performance.The first cycle discharge spe-cific capacity of the regenerated NCM523 obtained under experimental conditions is 159.053 mA·h/g at 0.11 C,and the discharge specific capacity is 145.615 mA·h/g after 100 cycles,with a good capacity re-tention rate of 91.55％.And its first cycle discharge specific capacity is 126.974 mA·h/g at a current den-sity of 5 C.Compared with the traditional direct regeneration method,the electrochemical properties of NCM523 prepared by ball milling-spray regeneration method are significantly improved.
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