A Novel Co₃O₄/MnO₂/C Electrode with Hierarchical Heterostructure for High‐performance Lithium‐Ion Batteries

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 hetero-structured 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 À 1 with an initial capacity of ∼ 1245.7 mAh g À 1 and a reversible capacity of ∼ 854.9 mAh g À 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 À 1 , and especially, the specific capacity remains ∼ 587.6 mAh g À 1 at a high current density of 2.0 A g À 1).