缓慢水解法制备纳米 TiO2 及其 作为锂离子电池负极材料的电化学性能研究.

Using titanium tetrachloride as the raw material, TiCl4 was prepared into a 0.5mol/L aqueous solution in an ice water bath under weakly alkaline conditions. The precipitate was obtained by low-temperature hydrolysis, and the precipitate was dried in a vacuum oven at 80 °C and roasted at low temperature of 400 °C for 12 hours to obtain white powder. Structural characterization was carried out through X-ray diffraction (XRD). The morphology was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The obtained sintered products were combined with metal lithium electrode materials and polyethylene separators to construct a semi battery system for battery performance testing. The results showed that titanium tetrachloride was used as the raw material to achieve slow hydrolysis under low temperature conditions, and then subjected to long-term low-temperature calcination to obtain a white powder of nanoscale rutile type TiO2, which has advantages such as small particle size, good dispersibility, narrow particle size distribution, and good sphericity. This product has a first discharge specific capacity of 169 mAh/g at 0.2 charge and discharge, and a discharge specific capacity of 69 mAh/g at 5 C, with a capacity retention rate of 91.69%, respectively. Its electrochemical performance is much higher than that of commercial TO2. Research has shown that the method of preparing TiO2, based on slow hydrolysis low-temperature sintering mechanism is a simple, low-cost, and suitable process for large-scale production. [ABSTRACT FROM AUTHOR]