A Novel Co 3 O 4 /MnO 2 /C Electrode with Hierarchical Heterostructure for High‐performance Lithium‐Ion Batteries

Abstract

Abstract Transition metal oxides (TMOs) are promising materials for next‐generation lithium‐ion batteries while the lithium storage and cycling stability of TMOs are still limited. Herein, a novel Co 3 O 4 /MnO 2 /C composite using metal‐organic frameworks (MOFs) as sacrificial templates is reported. MnO 2 and C shells are layer by layer coated on the MOF‐derived Co 3 O 4 /C samples via hydrothermal technique and heat treatment. When employed as anode materials for LIBs, the hierarchically heterostructured Co 3 O 4 /MnO 2 /C composites incorporate the merits of Co 3 O 4 , MnO 2 , and C, showing high Li storage performances at a current density of 0.2 A g −1 with an initial capacity of ∼1245.7 mAh g −1 and a reversible capacity of ∼854.9 mAh g −1 after 100 cycles, remarkable cycling stability, and excellent rate capability (almost 98 % recovery as the current density returns to the initial 0.2 A g −1 , and especially, the specific capacity remains ∼587.6 mAh g −1 at a high current density of 2.0 A g −1 ).