生物质气化制氢耦合废旧锂离子电池正极材料回收

Biomass Gasification for Hydrogen Production Coupled with Spend Lithium-Ion Battery Cathode Material Recycling

随着锂离子电池进入报废期,从废旧锂离子电池中回收有价金属具有重要的经济和环境意义。提出了一种生物质气化制氢与废旧锂离子电池还原焙烧回收相结合的方法。以松木屑(PS)为原料,在675℃条件下进行水蒸气气化,利用气化过程中产生的还原性气体(H_(2)、CO和CH4等)和半焦(C)对LiCoO_(2)进行原位分解还原,并使用CaO作为CO_(2)吸附剂,进一步提高气体中H_(2)的含量。结果表明,在675℃且PS与LiCoO_(2)混合质量比为1的条件下,Li和Co的回收率分别为83.4%±4%和96.5%±2%,且H2含量高达73%。本研究提供了一种绿色、环保、高效回收废旧锂电池中有价金属的有效方法。

As lithium-ion batteries enter the end-of-life phase,the recovery of valuable metals from spent lithium-ion batteries is of economical and environmental significance.Combined biomass gasification for hydrogen production and reduction roasting recovery process of spent lithium-ion batteries was proposed.Pine sawdust(PS)was selected as the sample for steam gasification at 675℃.LiCoO_(2)was in situ decomposed and reduced by reducing gas(H_(2),CO,CH_(4),etc.)and semicoke(C)produced in the process of pyrolysis and gasification.At the same time,the content of H 2 in the gas was further enhanced by using CaO as CO_(2)adsorbent.The results show that the recovery rates of Li and Co are 83.4%±4%and 96.5%±2%respectively,and H 2 yield can reach 73%at 675℃and the mass ratio of PS to LiCoO 2 of 1.This study provides a green,environment-friendly,and efficient method to recover valuable metals from spent lithium-ion batteries.