ZnNi‐MnCo2O4@CNT porous double heterojunction cage‐like structure with three‐dimensional network for superior lithium‐ion batteries and capacitors

Abstract

The rapid development of bimetallic-based materials (BTMs) in lithium ion battery (LIB) is mainly attributed to its synergistic effect and multi-component flexibility, but it still has huge challenge due to the unstable cycling performance, poor conductivity and understanding of additional capacity. In this paper, zinc atom-doped NiO-MnCo2O4 matrix (NZ-MC) with double heterostructure is prepared, and then the dispersed carbon nanotube (CNT) is compounded to construct 3D conductive network hybrid (NZ-MC@CNT), which can be served as excellent anode electrode for energy storage. Optimized NZ-MC@CNT has reversible discharge of 862.1 mA h g−1 at the higher current density 5 A g−1 after 2000 cycles and the superior rate capability of 818.2 mA h g−1 at 12 A g−1. Based on the detailed phase transition analysis and kinetic analysis, the high-energy application of optimized NZ-MC@CNT is mainly attributed to the outstanding pseudocapacitance at the region of double heterogeneous interface, thereby accelerating the reaction kinetics process. Mainwhile, the theoretical calculation and kinetics analysis are performed to deeply reveal the (de)lithiation pathways related to the energy storage mechanism about excellent electrochemical performance. In addition, NZ-MC@CNT was saved for different energy storage systems (LIBs/LICs/Li-DIBs) and present excellent performance, which further demonstrates the application potentiality of NZ-MC@CNT.