Preparation of nano-TiO2 by slow hydrolysis and its electrochemical performance as anode materials for lithium-ion batteries
Using titanium tetrachloride as the raw material,TiCl4 was prepared into a 0.5mol/L aqueous solu-tion in an ice water bath under weakly alkaline conditions.The precipitate was obtained by low-temperature hy-drolysis,and the precipitate was dried in a vacuum oven at 80 ℃ and roasted at low temperature of 400 ℃ 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 elec-trochemical 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 suit-able process for large-scale production.
titanium tetrachlorideslow hydrolysistitanium dioxidelithium ion battery
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