One-pot alternating current synthesis of SnO2 based composite with enhanced diffusion kinetic behaviors for lithium-ion batteries
摘要
SnO2 is used as electrode material with excellent properties, but it has some disadvantages such as slow reaction kinetics, low inherent conductivity and complex preparation process. Here, SnO2@carbon nanotubes (SnO2@CNTs) is synthesized through an efficient method of one-pot alternating current electrochemical dispersion. By using heat treatment at 400 °C, the SnO2@CNTs-400 composite material with abundant mesoporous structure is obtained, while the crystal particles are grown, and a strong bonding effect is formed with CNTs via powerful Sn—O—C bond. Benefiting from the introduction of high electrical conductivity CNTs and outstanding structural characteristics, as-prepared composite material (SnO2@CNTs-400) exhibit enhanced diffusion dynamics, lithium-ion transmission rate and structural steadiness. The specific capacity of SnO2@CNTs and SnO2@CNTs-400 as anodes for lithium-ion batteries can reach 690.2 mA·h/g and 836.5 mA·h/g, respectively, after 100 cycles at 0.5 A/g. The abundant chemical bonds and porous structure can be formed in composite via alternating current synthesis method, which takes significant in improving electrochemical properties.