Chemical Research in Chinese Universities ›› 2016, Vol. 32 ›› Issue (4): 674-677.doi: 10.1007/s40242-016-5490-2

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Chemical Evolution of LiCoO2 and NaHSO4·H2O Mixtures with Different Mixing Ratios During Roasting Process

WANG Dahui1, WEN Hao1, CHEN Huaijing2, YANG Yujiao1, LIANG Hongyan1   

  1. 1. State Key Laboratory of Advance Processing and Recycling of Nonferrous Metals, Lanzhou 730050, P. R. China;
    2. College of Science, Lanzhou University of Technology, Lanzhou 730050, P. R. China
  • Received:2015-12-16 Revised:2016-03-15 Online:2016-08-01 Published:2016-04-20
  • Contact: WANG Dahui E-mail:wangdh@lut.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.51264027) and the National Basic Research Program of China(No.2012CB722806).

Abstract:

Mixtures of NaHSO4·H2O and LiCoO2 extracted from spent lithium-ion batteries were prepared with molar ratios of 1:1, 1:2 and 1:3. The chemical evolution of the LiCoO2 and NaHSO4·H2O mixtures during the roasting process was investigated by means of thermogravimetric analysis and differential scanning calorimetry (TG-DSC), X-ray diffraction(XRD), scanning electron microscopy(SEM), and X-ray photoelectron spectroscopy (XPS). The results show that the chemical reactions in the LiCoO2 and NaHSO4·H2O mixtures proceed during the roasting process. The Li element in the product of the roasting process is in the form of LiNa(SO4). With the increase of the proportion of NaHSO4·H2O in the mixtures, the Co element evolves as follows: LiCoO2→Co3O4→ Na6Co(SO4)4→Na2Co(SO4)2. The roasting products exhibit dense structures and irregular shapes, and the bonding energy of Co increases.

Key words: Spent lithium-ion battery, LiCoO2, Sulfating roasting, Chemical evolution