Study On Modification Of Electrode Materials From Spent Lithium Ion Battery

Use of lithium ion battery,produce a large amount of spent lithium ion battery,recycling and disposal of waste lithium ion battery will not only can reduce the pollution to the environment,will also be able to obtain certain economic benefits.At present,the recycling of spent lithium ion battery technology has been a major breakthrough,but the existing technology high cost,complex operation,also can cause secondary pollution.Existing recovery technology focused on the anode material,simply for the cathode separation and recycling of copper foil,carbon negative waste is not effective to repair again.Study these problems LiCoO₂ waste and carbon negative restoration of waste reuse.（1）With the method of filling lithium to repair regeneration LiCoO₂ scrap.First spent lithium ion battery using electrolytic methods are expected to deal with saturated sodium sulfate solution,then disassembled,separation,LiCoO₂ scrap.The LiCoO₂ waste calcination to remove adhesive（PVDF）and conductive agent（acetylene black）,then adding Li₂CO₃ for high temperature sintering,LiCoO₂ materials.By studying the sintering time effect on the electrochemical properties and processing performance of the materials for LiCoO₂,found 900 ℃ for 12 h after sintering LiCoO₂,its discharge specific capacity can reach 135.4 mAh g-1,tap density is 2.635 g cm-3.Accordance with the requirements of the used again.（2）The preliminary exploration method to regenerate carbon negative waste.Cathode carbon negative in after simple separation of waste,adopt the method of heat-treated for repair renewable carbon negative waste.The carbon cathode waste in 200-500 ℃ calcination 1 h,the heat-treated temperature on the electrochemical performance and machining performance of carbon anode materials.The study found that 400 ℃ for 1 h discharge specific capacity of carbon anode materials reached 367 mAh g-1,tap density reached 1.0136 g cm-3,and first week of the coulomb efficiency is 77.80%.Proved that the heat-treated of carbon anode materials for the feasibility of the restoration.