Sustainable Utilization of Fe(Ⅲ) Isolated from Laterite Hydrochloric Acid Lixivium via Ultrasonic-Assisted Precipitation to Synthesize LiFePO4/C for Batteries

• DOI: 10.3390/ma17020342
• Publication Date: 2024-01-10T10:47:21Z
• Authors: Ziyang Xu; Boren Tan; Boyuan Zhu; Guangye Wei; Zhihui Yu; Jingkui Qu
• Keywords: Laterite; Hydrochloric acid; Coprecipitation

Ultrasonic-assisted precipitation was employed to sustainably isolate Fe in the hydrochloric acid lixivium of low-grade laterite for synthesis battery-grade iron phosphate. The recovery efficiency Ni and Co exceeded 99%, while removal impurity reached a maximum 95%. Precipitation parameters selective isolation (MgO precipitant, pH 1, 70–80 °C) were optimized used ultrasonic experiments. use waves process enhanced micromixing by reducing size primary grains mitigating particle agglomeration, thereby significantly improving purity isolated compound providing high-quality phosphate (FePO4·2H2O). LiFePO4/C composite prepared from as-precipitated FePO4 exhibited excellent electrochemical performance, with discharge capacity 149.7 mAh/g at 0.1 C 136.3 0.5 after 100 cycles, retaining almost 100% cycling efficiency. This novel facile method not only efficiently removes excess impurities leached due poor selectivity acid, but also enables high-value utilization these impurities. It enhances economic benefits simultaneously alleviating environmental pressure.