MnCO3/Mn3O4/reduced graphene oxide ternary anode materials for lithium-ion batteries: facile green synthesis and enhanced electrochemical performance

Abstract

Mn-Based compounds with high reversible capacities and eco-friendliness are one of the most promising anode materials for lithium ion batteries (LIBs), but their practical applications are still hindered by low rate capability, poor cycling stability, and high cost of production. Herein, we synthesize MnCO₃/Mn₃O₄/reduced graphene oxide (MnCO₃/Mn₃O₄/RGO) ternary composites through a green and facile strategy, which can take full advantage of the raw materials, mitigate pollution effectively, simplify the operating procedure, and shorten the preparation time to realize large-scale preparation. When used as anode materials for LIBs, benefitting from the advantage of their structure and effective synergy among MnCO₃, Mn₃O₄ and graphene, the ternary composites exhibit an excellent cycling stability of 988 mA h g⁻¹ after 200 cycles at 100 mA g⁻¹ and 532 mA h g⁻¹ after 800 cycles at 1 A g⁻¹, which is superior to those of binary MnCO₃/RGO and Mn₃O₄/RGO composites. Analyses using cyclic voltammetry, charge/discharge profiles, and electrochemical impedance spectroscopy reveal improved kinetics in the electrochemical reaction of the MnCO₃/Mn₃O₄/RGO ternary composite with cycling. Furthermore, a systematic study of the potential difference of the redox reaction provides a good explanation for the observed electrochemical performance of the ternary composites.