Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (10): 3151.doi: 10.7503/cjcu20210372

• Physical Chemistry • Previous Articles     Next Articles

Screening of Deep Eutectic Solvent Based on Efficient Recovery of Spent Lithium⁃ion Battery Cathode Materials

GONG Shanshan1,2, WU Tong1, WANG Guange1, HUANG Qing1,2(), SU Yuefeng1,2, WU Feng1,2   

  1. 1.School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China
    2.Beijing Institute of Technology Chongqing Innovation Center,Chongqing 401120,China
  • Received:2021-06-01 Online:2021-10-10 Published:2021-10-10
  • Contact: HUANG Qing E-mail:huangqing3121@sina.com
  • Supported by:
    the National Key Research and Development Project of China(2016YFB0100301);the National Natural Science Foundation of China(21875022)

Abstract:

To resolve the secondary pollution and high energy consumption caused by the recycling of spent lithium-ion batteries(LIBs), a green and efficient method for leaching valuable metals from spent LIBs cathode materials is developed. Choline chloride and different hydrogen bond donors(oxalic acid, malonic acid, glutaric acid and benzenesulfonic acid) were used to synthesize choline chloride/acid binary deep eutectic solvent(DES), chlorine choline/acid/H2O and choline chloride/acid/ethanol ternary DES. The formation process of the hydrogen bond between choline chloride and acid was characterized by means of Fourier transform infrared spectroscopy(FTIR) and nuclear magnetic resonance spectroscopy(NMR). The impacts of carboxylic acid alkyl chain length, acidity and addition of water and ethanol on the leaching of spent LiCoO2 were investigated. The results show that the leaching capacity of DES decrease with the increase of the carboxylic acid alkyl chain length. The acidity of the acid cannot be concluded as the main reason for the higher ability to dissolve metal oxides. The equimolar addition of water has little effect on the leaching efficiency of DES, while the equimolar addition of ethanol will affect the hydrogen bond structure of DES, which has a greater impact on the leaching efficiency. At last, choline chloride/benzenesulfonic acid/ethanol DES was screened as a green and efficient leaching agent for spent LiCoO2, leaching efficiencies of Li and Co were as high as 98.6% and 95.2%, respectively.

Key words: Deep eutectic solvent, Hydrogen bond, Spent lithium-ion battery, Efficient recovery

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