Recovery of lithium from spent LiFexMn1-xPO4 batteries through a leaching-precipitation method using H2SO4-H2O2-Na2S2O8

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy Pub Date : 2025-06-13 DOI:10.1016/j.hydromet.2025.106518

Jing Xie , Songwen Xiao , Dongfu Liu , Sizhe Li , Wenhua Xu , Guoxing Ren

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引用次数: 0

Abstract

As high-performance cathode materials, LiFe_xMn_1−xPO₄ (LMFP) batteries will become important lithium resources in the foreseeable future. In this study, a novel asynchronous oxidation approach was proposed to selectively recover Li from spent LMFP cathode powders. The spent LMFP powders were first selectively leached with H₂O₂ in sulfuric acid media, and the leachate was oxidatively precipitated with Na₂S₂O₈, resulting in a Li-rich solution. During this process, Fe and Mn can also be recovered in the form of FePO₄·2H₂O and MnPO₄·H₂O, respectively. The effects of the reaction conditions on the reaction efficiency were investigated in detail. The mechanism of lithium selective extraction was studied using thermodynamics and analyses based on X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM-EDS). The total leaching efficiencies of Li, Fe, and Mn were 93.2 %, 99.9 %, and 97.0 %, respectively, under optimal conditions. A closed-loop process was finally proposed for recycling spent LMFP cathode powders. The process is environmentally friendly and economically feasible based on the technoeconomic analysis.

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用H2SO4-H2O2-Na2S2O8浸出-沉淀法回收废LiFexMn1-xPO4电池中的锂

LiFexMn1−xPO4 （LMFP）电池作为高性能正极材料，在可预见的未来将成为重要的锂资源。在本研究中，提出了一种新的异步氧化方法来选择性地从废LMFP阴极粉末中回收锂。首先在硫酸介质中用H2O2选择性浸出LMFP粉末，然后用Na2S2O8氧化沉淀浸出液，得到富锂溶液。在此过程中，Fe和Mn也可以分别以FePO4·2H2O和MnPO4·H2O的形式被回收。研究了反应条件对反应效率的影响。利用热力学和x射线衍射（XRD）、x射线光电子能谱（XPS）、扫描电子显微镜（SEM-EDS）等分析手段研究了锂的选择性萃取机理。在最优条件下，Li、Fe和Mn的总浸出效率分别为93.2%、99.9%和97.0%。最后提出了一种闭环回收废旧LMFP阴极粉末的方法。技术经济分析表明，该工艺环境友好，经济可行。

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来源期刊

Hydrometallurgy 工程技术-冶金工程

CiteScore

9.50

自引率

6.40%

发文量

144

审稿时长

3.4 months

期刊介绍： Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.