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

作者：Xie, Ming; Zhang, Xiaoxue^*; Laakso, Jarmo; Wang, Hao; Levanen, Erkki

来源：Crystal Growth & Design, 2012, 12(5): 2166-2168.

DOI：10.1021/cg3003146

• LITHIUM-ION BATTERIES
• CATHODE MATERIALS

Supercritical carbon dioxide (scCO(2)) 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 20-30 mu m, together with impurity of Fe2PO5. After the scCO(2) treatment, the impurity phase was removed, and the aggregated platelets were broken into separate rhombus plates in size of about 3-5 mu m, along with the formation of flowerlike balls of about 10-20 mu m. On the other hand, H2 had the main morphology of platelets agglomerated in random directions in size of about 5 mu m and covered by materials of glassy state. After the scCO(2) measurement, the morphology was greatly changed and cubic particles of 1 and 2 mu m were formed, together with the better-shaped and separately distributed platelets of 1 and 2 mu 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.

• 出版日期2012-5
• 单位北京工业大学