Inorganic Chemicals Industry ›› 2022, Vol. 54 ›› Issue (12): 34-43.doi: 10.19964/j.issn.1000-4990.2022-0389

• Research & Development • Previous Articles     Next Articles

Study on leaching and thermodynamic of spent lithium-ion batteries with electrochemical reduction

HE Ting1,2,3(),KONG Jiao1,2,3,CUI Jingzhi4,CHEN Zhihao4,FU Tongtong4,GUO Zirui4,GU Shuai1,2,3(),YU Jianguo1,2,3()   

  1. 1. National Engineering Research Center for Integrated Utilization of Salt Lake Resources,East China University of Science and Technology,Shanghai 200237,China
    2. Engineering Research Center of Salt Lake Resources Process Engineering,Ministry of Education,East China University of Science and Technology
    3. Joint International Laboratory for Potassium and Lithium Strategic Resources,East China University of Science and Technology
    4. School of Chemical Engineering,East China University of Science and Technology
  • Received:2022-06-27 Online:2022-12-10 Published:2022-12-19
  • Contact: GU Shuai,YU Jianguo E-mail:y30210153@mail.ecust.edu.cn;gushuai@ecust.edu.cn;jgyu@ecust.edu.cn

Abstract:

In recent years,the rapid increase of lithium-ion batteries(LIBs) demand has produced an enormous amount of spent LIBs.The recovery of spent LIBs is of great significance to securing clean energy in China.Electrochemical leaching of spent LIBs cathode materials is a green and economical method.At present,the recycling of spent LIBs with electrochemical methods are suffered from long leaching time,low current efficiency,and high cell voltage.Based on this,an electrochemical reduction for recycling of spent LIBs by sacrificing anodes was proposed.In the diluted hydrochloric acid solution,electrochemical leaching experiments were carried out with spent LIBs cathode materials as the cathodes and copper plates as the anodes.The leaching efficiencies were 99.9% for Li+ and Co2+,the current efficiency was up to 99.8%,and the cell voltage was less than 0.427 V under optimum conditions.The thermodynamic calculation methods based on Eh-pH and Matlab were utilized to study the electrochemical reduction leaching process,and the results showed that higher temperature,more complex species and more coordination species contributed to the positive shift of leaching reaction balance.

Key words: spent lithium-ion batteries, electrochemical recycling, thermodynamics, cell voltage

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