A hollow Fe$_3$O$_4$-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, Fe$_3$O$_4$ 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 Fe$_3$O$_4$ nanospheres with a hollow structure wrapped by MnO$_2$ nanosheets (H-Fe$_3$O$_4$/MnO$_2$ NSs nanospheres).As a result of the synergetic effect of a high-capacity material coating and a robust hollow core, the H-Fe$_3$O$_4$/MnO$_2$ 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.

[学科分类] 材料工程

[关键词] Hollow Fe$_3$O$_4$;MnO$_2$;core–shell;hybrid electrode;lithium-ion battery.