文摘
Sulfated metal oxide SOb>4b>2−/Feb>2b>Ob>3b> 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 Feb>2b>Ob>3b>, the agglomeration of particles has been alleviated after the incorporation of SOb>4b>2−. Interestingly, the primary particle size of the SOb>4b>2−/Feb>2b>Ob>3b> (about 5 nm) is similar to its normal counterparts even after the calcination treatment. More importantly, SOb>4b>2−/Feb>2b>Ob>3b> exhibits a porous architecture, which is an intriguing feature for electrode materials. When used as anode materials in Li-ion batteries, SOb>4b>2−/Feb>2b>Ob>3b> delivered a higher reversible discharge capacity (992 mAh g−1), with smaller charge transfer resistance, excellent rate performance, and better cycling stability than normal Feb>2b>Ob>3b>. We believed that the presence of SOb>4b>2− and porous architecture should be responsible for the enhanced electrochemical performance, which could provide more continuous and accessible conductive paths for Li+ and electrons.
