Anatase TiO2 Nanotubes as Anodes for Lithium Ion Batteries

• Main Authors: Kuan-ChiehLai, 賴冠杰
• Other Authors: Hsisheng Teng
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/80466847136846210269

碩士 === 國立成功大學 === 化學工程學系 === 103 === This study reports an anatase TiO2 nanotubes (TNT) and reduced graphene oxide (RGO) hybrid that is synthesized via an in situ hydrothermal process followed freezing dry treatment (f-TNT/RGO). The structure and performances are compared with TNT, f-TNT and TNT/RGO. The f-TNT/RGO were characterized by XRD, Raman, FTIR, TEM, SEM, BET and TGA, indicating the coexistence of anatase and minor TiO2-B with the reduction of GO. The structure and anchoring to RGO are confirmed, showing the vary difference between the product with/without RGO and especially freezing dry, each affects the agglomeration of particles and separation between tubes, which contribute to BET surface area. The dramatic incensement of f-TNT/RGO (278 m2g-1) comes from the pores in the network of tubes. The discharge curve and broad feature of CV below 1.7 V display the surface and interfacial Li+ storage from TiO2 with high surface area after freezing dry. The f-TNT/RGO exhibits better rate performance, 239 and 155 mA h g-1 can be obtained at 1 and 30 C. The AC impedance analysis leads to the lower charge transfer resistance of f-TNT/RGO, which is due to (1) high surface area which can afford more Li+ flow; (2) the interfacial Li+ storage (pseudo-capacity) and (3) a faster electron transport attributed to the RGO. 100 % retention of its value at the fifth cycle can be obtained after 100 cycles at 30 C, and retain at 94 % after another 100 cycles.