A hollow Fe3O4-based nanocomposite anode for lithium-ion batteries with outstanding cycling performance

摘要

The fabrication of hybrid electrodes with conversion-type electrode materials has drawn growing interest in improving the capacity performance of lithium-ion batteries (LIBs) for many high-energy applications. However, as a typical conversion-type electrode material, Fe3O4 is usually restricted by large amount of volume change during repeated lithiation/delithiation course, which dramatically hinders the cycling stability of the constructed LIBs. We design a hybrid electrode of Fe3O4 nanospheres with a hollow structure wrapped by MnO2 nanosheets (H-Fe3O4/MnO2 NSs nanospheres). As a result of the synergetic effect of a high-capacity material coating and a robust hollow core, the H-Fe3O4/MnO2 NS hybrid electrode delivers reversible capacity as high as 590 mAh g(-1) at a current rate of 0.1C and maintains 92% of the initial reversible capacity after 1000 cycles at 1C.