Research on Comprehensive Recycling Technology of Waste Lithium Batteries AITranslate

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Chinese Library Classification Number:X705[环境科学与工程—环境工程]

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To address the environmental pollution caused by waste lithium iron phosphate batteries and the shortage of lithium resources,an innovative bipolar membrane method was proposed using recycled waste lithium iron phosphate batteries as the raw materials.LiOH was prepared from acid leached Li₂SO₄ by bi-polar membrane electrodialysis,then refined Li₂CO₃ was obtained,and battery grade LiFePO₄ cathode ma-terial was ultimately prepared.The main processes include crushing and sorting of lithium iron phosphate battery,black powder leaching,impurity removal of material liquid,and synthesis of iron phosphate and lithium iron phosphate,thereby obtaining the main products of Li₂CO₃ and FePO₄ and by-products such as aluminum particles and copper particles.Through synthesis regeneration technology,LiFePO₄ cathode ma-terials that meet the gradeⅠstandard in GB/T 30835-2014 are obtained.The prepared LiFePO₄ products have a first coulombic efficiency of over 96%and a rate performance of over 94.5%.This process achieves the goal of saving production costs of LiFePO₄ and realizing the recycling of renewable resources.