Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第20卷    第11期    总第140期    2010年11月

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文章编号:1004-0609(2010)11-2260-09
298.15 K下Li-Ti-H2O系φ—pH图及Li4Ti5O12的合成
邱文顺1,李运姣1,赵中伟1,霍广生1,习小明2,陈盼盼1

(1. 中南大学 冶金科学与工程学院,长沙 410083;2. 长沙矿冶研究院,长沙 410012)

摘 要: 运用双参数模型和同系线性规律对Li2Ti3O7、Li4Ti5O12和Li4TiO4的标准生成吉布斯自由能进行估算,并绘制在298.15 K时,不同离子浓度下Ti-H2O系和Li-Ti-H2O系的φ—pH图。结果表明:在水溶液中,Li4Ti5O12在pH为4.1~13.7之间具有较大的热力学稳定区域,从热力学角度预测了从水溶液合成Li4Ti5O12 的可能性,并通过实验在pH为9~10之间,采用TiCl4水溶液强制水解法制备出纯相尖晶石Li4Ti5O12,验证水溶液中合成Li4Ti5O12的可行性。

 

关键字: Li-Ti-H2O系;Li4Ti5O12;热力学;合成

φ—pH diagram of Li-Ti-H2O system at 298.15 K and
synthesis of Li4Ti5O12
QIU Wen-shun1, LI Yun-jiao1, ZHAO Zhong-wei1, HUO Guang-sheng1, XI Xiao-ming2, CHEN Pan-pan1

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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