Preparation of FePO4•2H2O from LiFePo4 mixed with LiNixCoyMn1-x-yO2 waste material
A method for preparing battery grade FePO4⋅2H2O from LiFePO4 and LiNixCoyMn1-x-yO2 mixed waste is proposed. The optimum leaching conditions included: temperature of 50°C, 3:1 liquid–solid mass ratio, 3.6 HCl/FePO4⋅2H2O mole ratio, 0.75 H2O2/FePO42H2O mole ratio, and 2 h reaction time. The solution o...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Serbian Chemical Society
2020-01-01
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| Series: | Journal of the Serbian Chemical Society |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0352-5139/2020/0352-51392000005T.pdf |
| Summary: | A method for preparing battery grade FePO4⋅2H2O from LiFePO4 and LiNixCoyMn1-x-yO2 mixed waste is proposed. The optimum leaching conditions included: temperature of 50°C, 3:1 liquid–solid mass ratio, 3.6 HCl/FePO4⋅2H2O mole ratio, 0.75 H2O2/FePO42H2O mole ratio, and 2 h reaction time. The solution obtained from the leaching waste material was diluted to a 1.0 M Fe concentration, then transferred to an 1 L beaker, where temperature, pH, complexing agent, ammonia addition rate and feeding mode were studied in order to determine their effects on the precipitation, particle size and morphology of FePO4⋅2H2O. High precipitation rate of Fe with low percentages of Al, Ni, Co, Mn in the FePO4⋅2H2O is achievable when precipitation is performed at a temperature of 85°C, pH of 2.0, and 20 g L-1 complexing agent. Furthermore, it was observed that a slow addition of ammonia and a flow feeding method contributed to the production of FePO4⋅2H2O, with small particle sizes and a flake morphology. |
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| ISSN: | 0352-5139 1820-7421 |