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

doi:10.19799/j.cnki.2095-4239.2019.0283

Abstract

Abstract:

To resolve the secondary pollution and high energy consumption caused by current recycling technology, a green and efficient method for recycling spent LiNi_1/3Co_1/3Mn_1/3O₂ (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:

TM 911

FAN Ersha, LI Li, LIN Jiao, ZHANG Xiaodong, CHEN Renjie, WU Feng. Low-temperature molten-salt-assisted recycling of spent LiNi_1/3Co_1/3Mn_1/3O₂ cathode materials[J]. Energy Storage Science and Technology, 2020, 9(2): 361-367.

Figures/Tables 9

References 28

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Low-temperature molten-salt-assisted recycling of spent LiNi_1/3Co_1/3Mn_1/3O₂ cathode materials

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