The 3D networked MnCO3-C composite as anode materials for lithium ion batteries

The Bayberry-like MnCO3 is prepared by hydrothermal method with sodium citrate as shape regulator. The crystalline structure, chemical component, micromorphology and pore size distribution of the as-synthesized sample are characterized by XRD, FE-SEM, HR-TEM, Raman spectra, TGA and Nitrogen desorption test (BET); The electrochemical performances are investigated by galvanostatic charge-discharge, which shown the discharge capacity of 407.2 mAh g(-1) at the current density of 100 mA g(-1) after 70 cycles. In order to improve the electrochemical properties of material, the nanostructured MnCO3 is successfully grown on porous sponge-like carbon to form the three-dimensional (3D) networked MnCO3-C composite via the in-situ hydrothermal method. Specifically, 3D networked MnCO3-C composite electrode delivers a high discharge capacity of 952.9 mAh g(-1) at 100 mA g(-1) over 70 cycles. The excellent electrochemical performance can be ascribed to the unique 3D structure of porous sponge-like carbon whose structure serves as an electron conductor, inhibits agglomeration of MnCO3 particles, and acts as an effective buffer against volume change of MnCO3 during cycling.