Energy Storage Science and Technology ›› 2020, Vol. 9 ›› Issue (2): 361-367.doi: 10.19799/j.cnki.2095-4239.2019.0283

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Low-temperature molten-salt-assisted recycling of spent LiNi1/3Co1/3Mn1/3O2 cathode materials

FAN Ersha1, LI Li1,2(), LIN Jiao1, ZHANG Xiaodong1, CHEN Renjie1,2, WU Feng1,2   

  1. 1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
    2. Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, China
  • Received:2019-12-19 Revised:2020-01-05 Online:2020-03-05 Published:2020-03-15
  • Contact: Li LI E-mail:lily863@bit.edu.cn

Abstract:

To resolve the secondary pollution and high energy consumption caused by current recycling technology, a green and efficient method for recycling spent LiNi1/3Co1/3Mn1/3O2 (NCM) cathode materials is proposed. Using ammonium chloride as the co-solvent, the method effectively leaches the valuable metals in the cathode materials through low-temperature roasting conversion and water-leaching at room temperature. The reaction parameters, namely, the roasting temperature, NH4Cl/NCM mass ratio, and roasting time, were investigated in detail. More than 97% of the Li, Ni, Co, and Mn were recovered under the optimum conditions (roasting temperature is 350 ℃, NH4Cl/NCM mass ratio is 3.5∶1, reaction time is 20 min). During the recycling process, the interphase conversion mechanism of the metal in the cathode material was systematically studied by X-ray diffraction analysis, scanning electron microscopy, and X-ray photoelectron spectroscopy. The energy intensity and industrial operability of the proposed recycling technology rivaled those of traditional hydrometallurgical and pyrometallurgical recycling technologies.

Key words: lithium ion battery, environmentally benign recycling, cathode materials, low-temperature roasting, water leaching

CLC Number: