Hierarchical Hollow Bimetal Oxide Microspheres Synthesized through a Recrystallization Mechanism for High‐Performance Lithium‐Ion Batteries

Abstract

AbstractBimetal oxide with its intricate nanostructure holds great potential for high‐performance electrode materials in lithium‐ion batteries (LIBs). Herein, a facile strategy for the fabrication of hierarchical hollow Co3O4/ZnCo2O4 microspheres is developed, involving a simple solvothermal synthesis and subsequent thermal annealing in air. An aggregation‐dissolution‐in situ recrystallization structure evolution and growth mechanism is proposed. Benefiting from the unique hierarchical hollow structure with rational porosity, synergistic effect of bimetal components, and better electrical conductivity, the as‐synthesized Co3O4/ZnCo2O4 hierarchical hollow microstructure shows outstanding lithium storage properties. As a result, a superior rate capability (842 mA h g−1 at a current density of 4 A g−1) and an excellent cycle life (754 mA h g−1 after 800 cycles at a current density of 2 A g−1) are obtained. The presented strategy could be applicable to the synthesis of mixed metal oxide hierarchical hollow structures with rational porosity for high‐performance LIBs.