Synthesis of Silicon-Germanium Compounds Anode Material By Potentiostatic Electrolysis Method in Molten Salt for Lithium-Ion Battery

Abstract

The fourth host materials (carbon, silicon, germanium, etc.) have high theoretical capacity and are usually used as anode materials for lithium ion batteries. Nanowires are considered to be excellent structures for high performance anode materials due to their good mechanical properties, which are conducive to electron transport and ion diffusion, as well as to improve structural deformation. Molten salt has the advantages of simple operation, high product activity and high yield. In this paper, the electrochemical reduction mechanism of silicon and germanium alloy was studied by means of cyclic voltammetry and potentiostatic electrolysis, and a series of germanium and silicon based materials were prepared by molten salt electrolysis. The method of preparing composite material by molten salt electrolysis is also provided. Si-Ge heterostructure nanowires were synthesized in NaCl-CaCl2 eutectic molten salt by potentiostatic electrolysis. The nanowires have high specific capacity, high volume capacity, good mechanical properties and stable diffusion path. It is beneficial to improve the electrochemical performance of lithium ion battery (recirculation and specific capacity). Figure 1