【摘要】 随着磷酸铁锂(LFP)电池退役潮的到来，废旧LFP的回收与再生工作成为研究热点，其中电池的健康状态(SOH)评估是再生流程中的重要一环。为了提供一种快捷的商用LFP电池SOH评估方法，采用了恒流充放电测试、X射线衍射(XRD)表征和磁性表征研究了循环1次、500次、1 000次和3 000次的商业LFP电池。恒流充放电测试结果 表明，上述电池的SOH分别为100%、90%、37%和30%，根据磁性表征结果评估上述电池的SOH误差不超过7%。通过磁性表征参数得到电池内部物质比例，将本源物质与活性锂损失、SOH关联起来，为未来开发基于磁性表征的原位无损检测技术提供依据。更多还原

【Abstract】 With the arrival of the retirement trend of lithium iron phosphate(LFP) batteries, the recycling and regeneration of waste LFP have become a recent research hotspot, among which the state of health(SOH) assessment of batteries is an important part of regeneration process. In order to provide a fast SOH evaluation method for commercial LFP batteries, constant current charge and discharge testing, XRD and magnetic characterization were used to study commercial LFP batteries after 1 cycle, 500 cycles, 1 000 cycles, and 3 000 cycles. The results of capacity measurement show that the SOH of the batteries are 100%, 90%, 37%, and 30% respectively. According to the magnetic characterization results, the SOH uncertainty of the batteries is evaluated to be no more than 7%. By examining the composition of the battery through magnetic characterization results, the original material is correlated with the loss of active lithium and SOH, providing a basis for the future development of in-situ non-destructive testing technology based on magnetic characterization.更多还原