A study on the construction of spherical MnCO3–Cu2O composites with enhanced electrochemical lithium storage performance

Abstract

In this work, thermodynamic multifunctional MnCO₃–Cu₂O composites with coral sphere shaped and pompon-like microstructures were constructed using a one chemical co-precipitation solvothermal process. The synergistic effect, the pseudocapacitive contribution and the p–n heterojunction enhance the electrochemical lithium storage performance and cycling stability of the formed MnCO₃–Cu₂O composites. At a current density of 2.0 A g⁻¹, the coral sphere shaped MnCO₃–Cu₂O and pompon-like MnCO₃–Cu₂O electrodes exhibit discharge capacities of 804.6 mA h g⁻¹ and 650.2 mA h g⁻¹ after 400 cycles. The coral sphere shaped MnCO₃–Cu₂O microstructure exhibits excellent electrochemical performance. This study presents a design strategy for the construction of MnCO₃-based composites that can be used in novel lithium-ion batteries.