New Method of Postmodifying the Particle Size and Morphology of LiFePO4 via Supercritical Carbon Dioxide

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• 作者：Ming Xie ; Xiaoxue Zhang ; Jarmo Laakso ; Hao Wang ; Erkki Lev盲nen
• 刊名：Crystal Growth & Design
• 出版年：2012
• 出版时间：May 2, 2012
• 年：2012
• 卷：12
• 期：5
• 页码：2166-2168
• 全文大小：221K
• 年卷期：v.12,no.5(May 2, 2012)
• ISSN：1528-7505

文摘

Supercritical carbon dioxide (scCO₂) was applied for the first time to post-treat two hydrothermally synthesized LiFePO₄ of H1 and H2 to entirely alter their particle size and morphology. H1 had the morphology of platelets aggregated in one direction in size of about 20鈥?0 渭m, together with impurity of Fe₂PO₅. After the scCO₂ treatment, the impurity phase was removed, and the aggregated platelets were broken into separate rhombus plates in size of about 3鈥? 渭m, along with the formation of flowerlike balls of about 10鈥?0 渭m. On the other hand, H2 had the main morphology of platelets agglomerated in random directions in size of about 5 渭m and covered by materials of glassy state. After the scCO₂ measurement, the morphology was greatly changed and cubic particles of 1 and 2 渭m were formed, together with the better-shaped and separately distributed platelets of 1 and 2 渭m. Therefore, by optimizing the experimental parameters in both the hydrothermal synthesis and supercritical carbon dioxide processing, it is possible to precisely control the particle size and morphology of LiFePO₄. This work also presents the possibility to control the particle size and morphology of other materials with a post-treatment by supercritical carbon dioxide.