A review on recycling technology of spent lithium iron phosphate battery

doi:10.12028/j.issn.2095-4239.2018.0183

Abstract

Abstract: Batteries for electric buses are mainly lithium iron phosphate batteries. Large numbers of spent batteries will be produced after the cycle life termination and cause a significant problem that how to deal with the spent batteries. In this paper, the current status of spent batteries recycling is introduced, as well as the main valuable components of the spent LiFePO₄ battery. The recycling and reusing methods of the spent LiFePO₄ materials such as solution-precipitation method, solid phase direct recycling and regeneration process, bio-dissolution technique, and mechanochemical treatment are introduced in detail. The vacuum pyrolysis process, organic solvent extraction and supercritical CO₂ extraction recovery electrolyte are presented as well. In addition, the separation process and modification method of negative electrode materials are introduced. The products recovered by precipitation method are industrial raw materials containing lithium and iron. This kind of method is easy to implement large-scale application, but it will produce a large number of acid and alkali waste liquor. The process of solid phase direct recycling and regeneration is shorter, but to remove the impurity is the difficulty for large-scale application. At last, the different recycling methods are proposed for different types of recycled materials to provide reference for the recycling of batteries.

Key words: spent Li-ion battery, lithium iron phosphate, electrolyte, negative electrode material, recovery, regeneration

CLC Number:

TM12.9

CHEN Yongzhen, LI Hualing, SONG Wenji, TU Xiaolin, FENG Ziping. A review on recycling technology of spent lithium iron phosphate battery[J]. Energy Storage Science and Technology, 2019, 8(2): 237-247.

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