(1. 中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083；2. 長沙礦冶研究院，長沙 410012)
摘 要: 運(yùn)用雙參數(shù)模型和同系線性規(guī)律對Li2Ti3O7、Li4Ti5O12和Li4TiO4的標(biāo)準(zhǔn)生成吉布斯自由能進(jìn)行估算，并繪制在298.15 K時(shí)，不同離子濃度下Ti-H2O系和Li-Ti-H2O系的φ—pH圖。結(jié)果表明：在水溶液中，Li4Ti5O12在pH為4.1~13.7之間具有較大的熱力學(xué)穩(wěn)定區(qū)域，從熱力學(xué)角度預(yù)測了從水溶液合成Li4Ti5O12 的可能性，并通過實(shí)驗(yàn)在pH為9~10之間，采用TiCl4水溶液強(qiáng)制水解法制備出純相尖晶石Li4Ti5O12，驗(yàn)證水溶液中合成Li4Ti5O12的可行性。
關(guān)鍵字: Li-Ti-H2O系；Li4Ti5O12；熱力學(xué)；合成
synthesis of Li4Ti5O12
（1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. Changsha Research Institute of Mining and Metallurgy, Changsha 410012, China）
Abstract: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.
Key words: Li-Ti-H2O system; Li4Ti5O12; thermodynamics; synthesis
