废旧镍钴锰酸锂电池正极材料闭环回收

Closed-loop recovery of anode materials for spent nickel-cobalt manganate lithium battery

提出了一种闭环回收废旧镍钴锰酸锂电池正极活性物质的方法。采用H_2SO_4为浸出剂,H_2O_2为还原剂,浸出回收4种金属离子。结果表明:硫酸浓度为1.5 mol·L^(-1),反应温度为70℃,反应时间为25 min,反应固液比为20∶1 (g∶L),过氧化氢体积分数为1%时,金属镍、钴、锰和锂的浸出率分别为96.8%、96.2%、93.8%和99.1%;动力学分析显示,Ni、Co、Mn、Li浸出反应表观活化能分别为51.75、44.90、46.77和36.08 kJ·mol^(-1),属于化学反应控制。分离浸出滤液中Ni、Co、Mn离子后,制备Li_2CO3终端产品,其XRD图谱显示产品成分较纯,可用于制备锂离子电池正极材料的前驱体。该工艺可实现废旧镍钴锰酸锂正极材料回收较高的经济和环境效益。

In this study,a closed-loop method for recovering the active material in anode of spent nickel-cobalt manganic acid lithium battery was proposed,which H2 SO4 and H2 O2 were used as leaching agent and the reducing agent,respectively,and four metal ions could be recovered through leaching.The results showed that the leaching rates of nickel,cobalt,manganese and lithium were 96.8%,96.2%,93.8%and 99.1%,respectively,at sulfuric acid concentration of 1.5 mol·L-1,reaction temperature of 70℃,reaction time of 25 min,solid-liquid ratio of 20∶1(g∶L)and H2 O2 volume ratio of 1%.Kinetic analysis indicated that the apparent activation energies of Ni,Co,Mn and Li leaching were 51.75,44.90,46.77 and 36.08 kJ·mol-1,respectively,which could belong to chemical reaction control.The Ni,Co and Mn ions separated from the leachate were used to prepare the Li2 CO3 terminal product,and its XRD pattern indicated a relatively pure ingredient,which can be used to prepare the precursor of the anode material for lithium ion battery.Through this closed-loop method,the high economic and environmental benefits of recycling nickel-cobalt manganic lithium anode materials can be achieved.