Preparation of Submicron Size Gamma Lithium Aluminate Particles from the Mixture of Alumina Sol and Lithium Salt by Ultrasonic Spray Pyrolysis
✍ Scribed by Yun Chan Kang; Seung Bin Park; Sang Woon Kwon
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 428 KB
- Volume
- 182
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
The research on the preparation of g-LiAlO 2 particles has Gamma lithium aluminate particles of submicron size were dimainly focused on solid state reactions and aqueous reactions rectly prepared by ultrasonic spray pyrolysis from two different such as in the sol-gel method (1,. In solid state solutions. One was a colloidal mixture of alumina sol and lithium reactions, high reactor temperature and long heating time salt (S1), and the other was an aqueous solution of aluminum are required for the formation of g-LiAlO 2 , and the preparanitrate and lithium salt (S2). The influence of these two different tion of pure g-LiAlO 2 particles is difficult because of the types of solution on the purity of the crystalline phase and the high volatility of lithium component. The sol-gel method morphology of the particles was investigated. The pure gamma starting from alkoxide precursors produces LiAlO 2 powder lithium aluminate particles were prepared at 800ЊC from the col-
with a more controlled ratio of lithium to aluminum due to loidal solution (S1) which was obtained from aluminum isopropoxide and lithium formate. The particles prepared from the col-its low processing temperature. But the sol-gel method has loidal solution (S1) had purer gamma phase than that of the a disadvantage in controlling the morphology of particles.
particles prepared from the aqueous solution of aluminum nitrate
In this study, a spray pyrolysis technique is proposed to and lithium salts (S2). The particles prepared from the aqueous prepare g-LiAlO 2 particles of submicron size, high surface solution of aluminum nitrate and lithium salt (S2) had smooth area, and spherical morphology. This is a continuous process surfaces and low surface area (7 m 2 /g), whereas the particles and directly produces phase-pure g-LiAlO 2 particles from prepared from the colloidal solution (S1) had rough surfaces and colloidal solution.
high surface area (45 m 2 /g).