文摘
Sulfated metal oxide SOub>4ub>2−up>/Feub>2ub>Oub>3ub> was prepared by a novel facile sol–gel method combined with a subsequent heating treatment process. The as-synthesized products were analyzed by XRD, FTIR, and FE-SEM. Compared with the unsulfated Feub>2ub>Oub>3ub>, the agglomeration of particles has been alleviated after the incorporation of SOub>4ub>2−up>. Interestingly, the primary particle size of the SOub>4ub>2−up>/Feub>2ub>Oub>3ub> (about 5 nm) is similar to its normal counterparts even after the calcination treatment. More importantly, SOub>4ub>2−up>/Feub>2ub>Oub>3ub> exhibits a porous architecture, which is an intriguing feature for electrode materials. When used as anode materials in Li-ion batteries, SOub>4ub>2−up>/Feub>2ub>Oub>3ub> delivered a higher reversible discharge capacity (992 mAh g−1), with smaller charge transfer resistance, excellent rate performance, and better cycling stability than normal Feub>2ub>Oub>3ub>. We believed that the presence of SOub>4ub>2−up> and porous architecture should be responsible for the enhanced electrochemical performance, which could provide more continuous and accessible conductive paths for Li+ and electrons.