摘要
Abstract
This study proposes a new method for recycling waste lithium iron phosphate batteries,which solves the problems of traditional wet metallurgy by reducing acid leaching-precipitation-solid phase regeneration.The experimental results show that under the optimal conditions of phosphoric acid concentration of 2.0 mol/L,solid-liquid ratio of 70 g/L,reaction temperature of 70℃,and reaction time of 120 min,the leaching rates of Li+ and Fe2+ are 98.1%and 98.0%,respectively;when the pH is 6.5,the prepared precipitate product Fe-P molar ratio is 1.50∶1.00,which is Fe3(PO4)2·8H2O with high purity;Fe3(PO4)2·8H2O can be used as a precursor to prepare LiFePO4 cathode materials,with excellent electrochemical performance,while the charge discharge rate(C)can reflect the battery capacity and charging equipment energy consumption,and the first discharge specific capacity at 0.1C is 139.9 mA·h/g,and the capacity retention rate after 200 cycles at 1C is 97.0%.关键词
还原酸浸/Fe3(PO4)2·8H2O/固相再生/LiFePO4Key words
reducing acid leaching/Fe3(PO4)2·8H2O/solid phase regeneration/LiFePO4分类
信息技术与安全科学
