Electrochemical properties of spherically shaped dense V₂O₅ cathode powders prepared directly by spray pyrolysis

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• 作者：You Na Ko ; Jung Hyun Kim ; Seung Ho Choi ; Yun Chan Kang ; ^{yckang@konkuk.ac.kr}
• 关键词：Cathode material ; Spray pyrolysis ; Vanadium pentoxide ; Lithium battery
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：1 August, 2012
• 卷：211
• 期：Complete
• 页码：84-91
• 文件大小：1491 K

摘要

Spherically shaped vanadium pentoxide (V₂O₅) cathode powders with porous or dense morphologies are prepared directly via spray pyrolysis by varying the preparation temperatures between 600 and 1000 掳C. The powders prepared at 600 掳C consist of nanometer-sized rod-shaped crystals with porous structures. The V₂O₅ powders prepared at 1000 掳C have spherical shapes, clean surfaces, and dense structures, because of complete melting of the powders that occurs inside the hot-wall reactor. The Brunauer-Emmett-Teller (BET) surface areas of the V₂O₅ powders decrease from 24.7 to 3.2 m² g^鈭? when the preparation temperature increases from 600 to 1000 掳C. The V₂O₅ powders prepared at 1000 掳C have better cycle properties than those prepared at 600 and 800 掳C. The discharge capacity of the V₂O₅ powders prepared at 1000 掳C decreases from 432 mAh g^鈭? to 263 mAh g^鈭? after 20 cycles, in which the capacity retention is 61%.