Electrochemical process for recovery of metallic Mn from waste LiMn_(2)O_(4)-based Li-ion batteries in NaCl−CaCl_(2)melts  

作　　者：Jinglong Liang Dongbin Wang Le Wang Hui Li Weigang Cao Hongyan Yan 

机构地区：[1]College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2022年第3期473-478,共6页矿物冶金与材料学报（英文版）

基　　金：the National Nat-ural Science Foundation of China(No.51774143).

摘　　要：new method is proposed for the recovery of Mn via the direct electrochemical reduction of LiMn_(2)O_(4) from the waste of lithium-ion batteries in NaCl−CaCl_(2) melts at 750°C.The results show that the LiMn_(2)O_(4) reduction process by the electrochemical method on the coated electrode surface occurs in three steps:Mn(IV)→Mn(III)→Mn(II)→Mn.The products of this electro-deoxidation are CaMn2O4,MnO,(MnO)x(CaO)1−x,and Mn.Metal Mn appears when the electrolytic voltage increases to 2.6 V,which indicates that increasing the voltage may promote the deoxidation reaction process.With the advancement of the three-phase interline(3PI),electric deoxygenation gradually proceeds from the outer area of the crucible to the core.At high voltage,the kinetic process of the reduction reaction is accelerated,which generates double 3PIs at different stages.

关 键 词：lithium-ion-battery waste electrochemistry of melts Mn recovery ELECTRO-DEOXIDATION lithium manganate 

分 类 号：X705[环境科学与工程—环境工程] TF792[冶金工程—钢铁冶金]