Hierarchical MnV2O4 double-layer hollow sandwich nanosheets confined by N-doped carbon layer as anode for high performance lithium-ion batteries.

Abstract

Binary transition metal oxides, especially vanadate metal oxides, are highly desirable for lithium-ion batteries (LIBs) anode materials due to their low-budget and high theoretical lithium storage capacity. However, low conductivity and poor cycle stability caused by volume changes during charge and discharge limit their grid-scale applications. Herein, a novel spinel MnV2O4 double-layer hollow sandwich nanosheets enclosed in N-doped porous carbon layer (MnV2O4/NC) was efficiently synthesized in 5\u202fmin by microwave-assisted and in-situ pyrolysis the coated polydopamine. MnV2O4/NC shows the superior performance as anode for LIBs with a specific capacities of 760\u202fmA\u202fh\u202fg-1 at 1000\u202fmA\u202fg-1 and outstanding of cycling stability with a specific capacities of 525.5\u202fmA\u202fh\u202fg-1 after 1000 cycles even at 5000\u202fmA\u202fg-1, respectively, which due to its unique double-layer hollow sandwich microstructure, mixed lithium storage mechanism and in-situ coating of nitrogen-doped carbon layer.