Preparation of LiFePO4/C cathode material by extracting Fe2O3 from laterite nickel ore by ammonium jarosite method

ABSTRACT

In the context of the COVID-19 pandemic and the war between Russia and Ukraine, domestic oil prices have skyrocketed. Saving resources and develop lithium ion batteries with excellent performance are particularly important. In view of unreasonable utilization of non-target elements in laterite nickel ore and high energy consumption of traditional sulfate roasting laterite nickel ore, a pioneering idea was adopted to combine laterite nickel ore with LiFePO 4 , which not only meets the resource saving but also prepares lithium ion batteries with excellent performance, in this study. Using ammonium sulfate roasting laterite nickel ore-ammonium jarosite iron precipitation and hydrolysis preparation of Fe 2 O 3 -carbon thermal reduction preparation of LiFePO 4 /C process means, to achieve the ultimate goal of preparing LiFePO 4 from laterite nickel ore. Determining the optimum conditions of each part of experiment by single factor experiment and orthogonal experiment. It was concluded that under the optimal preparation conditions, the discharge specific capacity of lithium ion battery was 164.56 mAh/g at the rate of 0.5 C, and it was 94% of the theoretical capacity. After 100 cycles, we could find that the discharge specific capacity could be maintained at 162.78 mAh/g, and the capacity retention rate still reached 98%. • Preparation of LiFePO 4 /C cathode material from laterite nickel ore for rational utilization of resources. • Ammonium sulfate roasting laterite nickel ore can greatly improve the recovery rate of nickel and iron resources • The ammonium jarosite method has high iron precipitation rate, simple operation and less pollution. • The preparation of LiFePO 4 /C cathode material by carbothermal reduction method is conducive to practical applications. [ FROM AUTHOR]