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http://dx.doi.org/10.7844/kirr.2022.31.4.40

A Study on the Leaching Effect and Selective Recovery of Lithium Element by Persulfate-based Oxidizing Agents from Waste LiFePO4 Cathode  

Kim, Hee-Seon (Advanced Materials and Processing Center, Institute for Advanced Engineering (IAE))
Kim, Dae-Weon (Advanced Materials and Processing Center, Institute for Advanced Engineering (IAE))
Jang, Dae-Hwan (Advanced Materials and Processing Center, Institute for Advanced Engineering (IAE))
Kim, Boram (Advanced Materials and Processing Center, Institute for Advanced Engineering (IAE))
Jin, Yun-Ho (Advanced Materials and Processing Center, Institute for Advanced Engineering (IAE))
Chae, Byung-Man (KMC Co., LTD)
Lee, Sang-Woo (KMC Co., LTD)
Publication Information
Resources Recycling / v.31, no.4, 2022 , pp. 40-48 More about this Journal
Abstract
In waste lithium iron phosphate (LFP) batteries, the cathode material contains approximately 4% lithium. Recycling the constituent elements of batteries is important for resource circulation and for mitigating the environmental pollution. Li contained in the waste LFP cathode powder was selectively leached using persulfate-based oxidizing agents, such as sodium persulfate, potassium persulfate, and ammonium persulfate. Leaching efficiency and waste LFP powder properties were compared and analyzed. Pulp density was used as a variable during leaching, which was performed for 3 h under each condition. The leaching efficiency was calculated using the inductively coupled plasma (ICP) analysis of the leachate. All types of persulfate-based oxidizing agents used in this study showed a Li leaching efficiency over 92%. In particular, when leaching was performed using (NH4)2S2O8, the highest Li leaching percentage of 93.3% was observed, under the conditions of 50 g/L pulp density and an oxidizing agent concentration of 1.1 molar ratio.
Keywords
waste $LiFePO_4$ battery; recycling; persulfate oxidizing agents; lithium recovery; selective leaching;
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Times Cited By KSCI : 4  (Citation Analysis)
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