Electrochemical properties of Li₂O-2B₂O₃ glass-modified LiMn₂O₄ powders prepared by spray pyrolysis process

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• 作者：Seung Ho Choi ; Jung Hyun Kim ; You Na Ko ; Young Jun Hong ; Yun Chan Kang ; ^{yckang@konkuk.ac.kr}
• 关键词：Cathode material ; Spray pyrolysis ; Lithium manganate ; Glass material
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：15 July, 2012
• 卷：210
• 期：Complete
• 页码：110-115
• 文件大小：1572 K

摘要

Li₂O-2B₂O₃ glass-modified LiMn₂O₄ cathode powders are prepared using spray pyrolysis. The powders with 1 and 5 wt%glass material have a spherical shape, dense structure, and large grain size. The BET surface areas of LiMn₂O₄ powders with 0 and 1 wt%glass material are 15.0 and 5.9 m² g^鈭?, and their mean crystallite sizes are 29 and 49 nm. The lithium boron oxide (LBO) glass material improves the cycle properties as well as the initial discharge capacities of the LiMn₂O₄ powders at a constant current density of 1 C. The discharge capacity of LiMn₂O₄ powders without any glass material decreases from 116.3 to 92.6 mAh g^鈭? after 100 cycles, the reduced capacity being 80%of the initial capacity. However, the discharge capacity of the LiMn₂O₄ powders with 1 wt%glass material decreases from 131.0 to 113.2 mAh g^鈭? after 100 cycles; thus, the capacity retention is 86%of the initial capacity.