Construction of Cu2+-doped MnCO3 micro-rhombohedrons and micro-olives as promising anode materials for high performance lithium-ion batteries

Abstract

A facile solvothermal process was proposed to construct Cu²⁺-doped MnCO₃ micro-rhombohedrons and micro-olives. The morphology of synthesized MnCO₃ particles can be adjusted by the amount of Cu(NO₃)₂·3H₂O in the initial reactants. Furthermore, the electrochemical behavior of as-prepared MnCO₃ samples were studied via galvanostatic charge–discharge, cyclic voltammetry, rate performance and electrochemical impedance spectra. The reversible capacity of olive-shaped MnCO₃ stabilized at 823.5 mA h g⁻¹ over 1000 cycles at 0.5 A g⁻¹. Furthermore, the specific capacity of olive-shaped MnCO₃ micro-structures retained at 325.3 mA h g⁻¹ at a rate current density of 5.0 A g⁻¹. Pseudocapacitive effective was applied to investigate and analyze the electrochemical kinetics of the formed MnCO₃ microstructures. The results display that Cu²⁺-doped MnCO₃ materials endow outstanding advantages for high-efficiency energy storage devices.