φ-pH diagram of Li-Ti-H2O system at 298.15 K and synthesis of Li4Ti5O12

作者：Qiu Wen Shun^*; Li Yun Jiao; Zhao Zhong Wei; Huo Guang Sheng; Xi Xiao Ming; Chen Pan Pan

来源：Chinese Journal of Nonferrous Metals, 2010, 20(11): 2260-2268.

• Aqueous solutions
• Forced hydrolysis
• Li-Ti-H2O system
• Li4Ti5O12
• Linear rule
• pH diagrams
• Synthesis
• Thermodynamically stable
• TiO
• Two-parameter models
• Wide pH range

The standard Gibbs free energies of the formation of Li2Ti3O7, Li4Ti5O12 and Li4TiO4 were estimated using two-parameter model and congeneric linear rule. The φ-pH diagrams of Ti-H2O and Li-Ti-H2O systems at different concentrations were drawn at 298.15 K. The results show that Li4Ti5O12 has a thermodynamically stable area in a wide pH range between 4.1 and 13.7 in aqueous solution. This indicates a great possibility for the synthesis of Li4Ti5O12. The pure spinel Li4Ti5O12 is successfully obtained from an aqueous TiCl4 solution by forced hydrolysis at pH between 9 and 10. This indicates that the synthesis of Li4Ti5O12 in an aqueous solution is feasible.

• 出版日期2010
• 单位中南大学