High specific surface area TiO2 microspheres as anodes for Na+ ion battery applications

• Main Authors: Wang, Yu-Xuan, 王于瑄
• Other Authors: Chiu, Hsin-Tien
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/64478216263434784730

碩士 === 國立交通大學 === 應用化學系碩博士班 === 104 === Among the various battery technologies, lithium ion battery (LIB) is quite mature but there were questions regarding increasing prices of Li mineral reserves and disadvantage in a few specific locations. However, sodium is substantially less expensive, more abundant than lithium which let sodium ion batteries have been considered as a desirable alternative to LIB. Among the known materials, TiO2 is regarded as powerful candidates due to the non-toxic, low cost, and small volume change during Na+ ion insertion. In this study, facile route was established to synthesize high specific surface area TiO2 microspheres by using amino acids (arginine and monosodium glutamate) as the assistances. The solvothermal method was carried out in a heated Teflon stainless-steel autoclave. The as-synthesized TiO2 were further processed at 400 °C under air to generate the nanosheet spheres (NS) and solid spheres with nanosheets (SS). They were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and nitrogen adsorption-desorption analysis. The isotherms revealed specific surface areas were 116 and 91 m2/g, respectively. The products were used as anodes for Na ion battery. The cells of NS showed a reversible capacity 145 mAh/g after 100 discharge/charge cycles at a current density of 0.1 C (1 C = 335 mA/g). The anode reached 85 mAh/g and 62 mAh/g under high rates, 2 C and 5 C respectively. The results showed that high specific surface area TiO2 exhibited good reversible capacity and cyclic stability as promising candidates as anodes for sodium ion batteries.