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 grade Ⅰ standard 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.
关键词
磷酸铁锂电池/回收利用/破碎分选/湿法冶金/双极膜/Li2CO3
Key words
lithium iron phosphate battery/recycling/crushing and sorting/hydrometallurgy/bipolar mem-brane/Li2CO3
维普
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