Amorphous FePO4/reduced graphene oxide composite prepared from jarosite residue and its application as a novel anode material for lithium-ion batteries.

Amorphous FePO 4 /rGO composite is synthesized by a selective chemical precipitation method from the acid-leaching liquor of jarosite residue. When used as a novel anode material for lithium-ion batteries (LIBs), the as-prepared FePO 4 /rGO composite exhibits superior cyclic performance and outstanding high-rate capability in a half cell. More importantly, the full LIBs assembled with FePO 4 /rGO anode and commercial Li(Ni 0.5 Co 0.2 Mn 0.3)O 2 (NCM523) cathode still delivers a high and stable capacity of 674.9/528.7 mA h g⁻¹ after 100/300 cycles at 0.2/0.5 A g⁻¹, indicating the great potential of this FePO 4 /rGO composite as a novel high-performance anode material for LIBs. This work proposes a facile, efficient, and cost-effective strategy for the high-valued utilization of jarosite residue and provides a reference for the design and development of FePO 4 /rGO as a novel anode material for LIBs. [Display omitted] • FePO 4 /rGO composite is prepared by a selective chemical precipitation method. • The leaching liquor of jarosite residue was used as the Fe source for FePO 4. • FePO 4 /rGO composite exhibits an outstanding lithium ions storage performance. • Synergistic effect of FePO 4 and rGO boosts the electrochemical performance. • The FePO 4 /rGO composite anode shows good performance in full LIBs. Rational utilization of jarosite residue is significantly important from the view of environmental protection and resource recycling. Herein, we report a facile preparation of porous amorphous FePO 4 /reduced graphene oxide (rGO) composite by utilizing the iron resource in jarosite residue with a selective chemical precipitation method, and demonstrate its great potential as a high-performance anode material of lithium-ion batteries (LIBs). The FePO 4 /rGO composite exhibits superior cyclic performance (812.7 mA h g⁻¹ over 300 cycles at 500 mA g⁻¹) and high-rate capability (335.2 mA h g⁻¹ even at a high current density of 10 A g⁻¹) in a half cell. More importantly, the full LIB assembled with FePO 4 /rGO anode and commercial Li(Ni 0.5 Co 0.2 Mn 0.3)O 2 (NCM523) cathode still delivers a high and stable capacity of 674.9/528.7 mA h g⁻¹ upon 100/300 cycles at 200/500 mA g⁻¹, indicating the great potential of this FePO 4 /rGO composite as a new anode material with high lithium storage performance. This work proposes a simple, feasible, and cost-effective strategy for the high-valued utilization of jarosite residue and provides a reference for the design and development of FePO 4 -based anode materials for LIBs. [ABSTRACT FROM AUTHOR]