Recovery of Lithium Iron Phosphate by Specific Ultrasonic Cavitation Parameters

Ming Zhou,Jingwei Zhang,Wanli Cheng,Song Chen,Kanglin Liu,Mingdeng Wei

doi:10.3390/su14063390

Ming Zhou, Jingwei Zhang + Show 4 more

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https://doi.org/10.3390/su14063390

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Abstract

With the widespread use of lithium iron phosphate batteries in various industries, the amount of waste lithium iron phosphate batteries is also increasing year by year, and if not disposed of in a timely manner, will pollute the environment and waste a lot of metal resources. In the composition of lithium iron phosphate batteries, the cathode has an abundance of elements. The ultrasonic method is a crucial method to recover waste LiFePO4 batteries. It has the following disadvantages, such as the lack of empirical parameters and suitable research equipment. In order to overcome the inefficiency of the LiFePO4 recycling method, the airborne bubble dynamical mechanism of ultrasound in the removal of lithium phosphate cathode material was studied by a high-speed photographic observation and Fluent simulation and the disengagement process. Mainly aimed at the parameters such as action time, power, frequency, and action position in the detachment process were optimized. The recovery efficiency of lithium iron phosphate reached 77.7%, and the recovered lithium iron phosphate powder has good electrochemical properties, with the first charge–discharge ratio of up to 145 (mAh)/g. It is shown that the new disengagement process established in this study was adopted for the recovery of waste LiFePO4.

Highlights

Academic Editor: RajeshIn 1997, Padhi et al first reported that lithium iron phosphate with an olivine structure could be used as the cathode material for lithium-ion batteries, and lithium iron phosphate has a theoretical specific capacity of 170 mAh/g and a 3.5 V charging platform for lithium.Compared with traditional lithium-ion battery materials, it is an ideal material for power lithium batteries because of its wide source of raw materials, outstanding safety performance, good cycling performance, good thermal stability, low cost, and no environmental pollution [1–3]
Lithium iron phosphate (LiFePO4 ) is a green cathode material [7–9]. It is used as a cathode material for power lithium-ion batteries, which has a lot of advantages, such as low cost of use, long life, high safety, and environmental friendliness [10–13]
With the aim of recovering lithium iron phosphate batt experimental research equipment was firstly built by studying the cavitatio

Summary

Introduction

Compared with traditional lithium-ion battery materials, it is an ideal material for power lithium batteries because of its wide source of raw materials, outstanding safety performance, good cycling performance, good thermal stability, low cost, and no environmental pollution [1–3]. Lithium iron phosphate (LiFePO4 ) is a green cathode material [7–9]. It is used as a cathode material for power lithium-ion batteries, which has a lot of advantages, such as low cost of use, long life, high safety, and environmental friendliness [10–13]. There are many waste batteries and lithium iron phosphate materials from the offcuts of the production process; if they are not properly recycled, it will bring to environmental pollution and cause waste of materials [14–17]

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