Different phase iron oxide cathode materials for the
lithium–oxygen
battery were synthesized by taking acid-pickled iron oxide red industrial
waste as a raw resource. Based on the high economic efficiency and
high industrial feasibility of the process, it can realize a circular
economy that not only develops a potential high-performance cathode
material from industrial waste, thereby increasing economic efficiency,
but also makes a significant contribution to environmental protection
and increases the value of pickled iron oxide red. The obtained Fe3O4 material shows good electrochemical properties
when employed as the cathode material for the lithium–oxygen
battery. It delivered the discharge capacity up to 11 751 mA
h g–1 at the current density of 100 mA g–1, 97 cycles with the capacity fixed at 500 mA h g–1, and 58 cycles with a reversible capacity of 1000 mA h g–1. This enhanced electrochemical performance is attributed to a combination
of an abundant oxygen vacancy effect on the surface and Fe mix-valence
state effects.
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