Study on the Reduction Acid Leaching Behavior of the Cathode Materials of Hybrid Lithium Ion Batteries Waste

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Abstract For the purpose of high-efficiency separation and leaching of the valuable metal elements in spent lithium ion battery cathode materials, two blended compositions have been designed:LiCoO₂ and Li(Ni_1/3Co_1/3Mn_1/3)O₂, LiMn₂O₄ and Li(Ni_1/3Co_1/3Mn_1/3)O₂. Effects of reducing agent, concentration of sulfuric acid, leaching temperature, and liquid-solid ratio on the leaching process were investigated in details. The optimal leaching parameters of LiCoO₂ and Li(Ni_1/3Co_1/3Mn_1/3)O₂ waste are:leaching temperature 80℃, reaction time 90 minutes, H₂SO₄ concentration 2.3 mol·L^-1, ratio of liquid and solid R=8 mL·g^-1, The amount of reducing agent Na₂SO₃=1.2 times the theoretical amount. The optimal leaching experiment parameters of mixed waste composed of LiMn₂O₄ and Li(Ni_1/3Co_1/3Mn_1/3)O₂ are:leaching temperature 60℃, reaction time 90 minutes, H₂SO₄ concentration 2.3 mol· L^-1, R=8 mL·g^-1, the amount of reducing agent Na₂SO₃=1.2 times the theoretical amount. The obtained leaching law provides a reference idea for the wide adaptability of the recovery process of mixed lithium-ion battery cathode waste.

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	Articles by authors
	Weng Yaqing
	Yan Nanfu
	Cui Hongmin
	Wang Shuang

Keywords： spent lithium-ion batteries recycling blended materials reductive acid leaching

Received 2021-09-25;

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Weng Yaqing, Yan Nanfu, Cui Hongmin, Wang Shuang.Study on the Reduction Acid Leaching Behavior of the Cathode Materials of Hybrid Lithium Ion Batteries Waste[J] Chemcial Industry and Engineering, 2021,V38(6): 65-73

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