Synthesis of Ge/C composites as anodes using glucose as a reductant and carbon source for lithium-ion batteries

Abstract

Ge-based materials as anodes in lithium ion batteries (LIBs) having a large theoretical reversible capacity are needed to overcome the unstable structural and electrochemical properties and pulverization of the electrodes for high-performance LIBs. Here, we synthesized Ge/C composites as anodes for use in LIBs via heating a mixture of GeO₂ powder and glucose as both a reductant and carbon source at 900 °C under a nitrogen atmosphere. The data from X-ray diffraction (XRD), Raman spectroscopy, and transmission electron microscopy (TEM) shows that the as-prepared samples consist of crystalline Ge particles and an amorphous carbon phase. Compared to pure Ge, the Ge/C samples exhibit discharge capacities of ∼627.1 mA h g⁻¹, improved cyclability, and excellent rate properties at a current of 3200 mA g⁻¹.