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A Novel Strategy for the Synthesis of Fe₃(PO₄)₂ Using Fe-P Waste Slag and CO₂ Followed by Its Use as the Precursor for LiFePO₄ Preparation.

ABSTRACT: A novel method whose starting materials was Fe-P waste slag and CO₂ using a closed-loop carbon and energy cycle to synthesize LiFePO₄/C materials was proposed recently. In the first step, Fe-P slag was calcinated in a CO₂ atmosphere to manufacture Fe₃(PO₄)₂, in which the solid products were tested by XRD (X-ray diffraction) analysis and the gaseous products were analyzed by the gas detection method. In the second step, as-synthesized Fe₃(PO₄)₂ was further used as the Fe and P source to manufacture LiFePO₄/C materials. Also, the influence of the preparation conditions of Fe₃(PO₄)₂, including calcination time and calcination temperature, on the energy storage properties of as-obtained LiFePO₄/C was investigated. It was found that the LiFePO₄/C materials, which was synthesized from Fe₃(PO₄)₂ obtained by calcining Fe-P waste slag at 800 °C for 10 h in CO₂, exhibited a higher capacity, better reversibility, and lower polarization than other samples. The discharge capacity of as-obtained LiFePO₄/C can reach 145 mAh/g at 0.1 C current rate. This work puts forward an environment-friendly method of manufacturing LiFePO₄/C cathode materials, which has a closed-loop carbon and energy cycle.

SUBMITTER: Sun Y

PROVIDER: S-EPMC6647990 | biostudies-literature |

REPOSITORIES: biostudies-literature

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