In situ confined-synthesis of mesoporous FeS2@C superparticles and their enhanced sodium-ion storage properties

Abstract

Mesoporous FeS₂@C superparticles chemically converted from Fe₃O₄ nanoparticle superlattices were used as anode materials for sodium-ion batteries with superior electrochemical performance. The partial etching of Fe₃O₄ nanoparticles creates appropriate void space, which is beneficial for confining the growth of ultrasmall FeS₂ nanoparticles during sulfidation and for mitigating volume change of active materials during cycling.