Influence of synthesis conditions on electrochemical properties of high-voltage Li1.02Ni0.5Mn1.5O4 spinel cathode material
Influence of synthesis conditions on electrochemical properties of high-voltage Li1.02Ni0.5Mn1.5O4 spinel cathode material
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DOI：
10.1016/j.jpowsour.2009.04.012
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发表时间：
2009-09
影响因子：
9.2
通讯作者：
B. Hwang;Y. W. Wu;M. Venkateswarlu;M. Cheng;R. Santhanam
中科院分区：
文献类型：
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作者：
B. Hwang;Y. W. Wu;M. Venkateswarlu;M. Cheng;R. Santhanam
采用柠檬酸辅助的溶胶-凝胶法成功合成了Li1.02Ni0.5Mn1.5O4尖晶石正极材料。用X射线衍射仪和扫描电子显微镜对材料的结构和形貌进行了分析。用循环伏安法和恒电流充放电测试方法研究了材料在25℃和55℃两种不同温度下的电化学性能。初始容量和容量保持率高度依赖于材料的粒度、粒度分布、结晶度和纯度。在800℃和850℃下合成的Li1.02Ni0.5Mn1.5O4材料在LiPF6基电解液中的容量和容量保持率在3.5~4.9V之间表现出最好的电化学性能。
Li1.02Ni0.5Mn1.5O4spinel cathode materials were successfully synthesized by a citric acid-assisted sol–gel method. The structure and morphology of the materials have been examined by X-ray diffraction and scanning electron microscopy, respectively. Electrochemical properties of the materials were investigated using cyclic voltammetry and galvanostatic charge/discharge measurements at two different temperatures (25 and 55°C) using lithium anode. The initial capacity and capacity retention are highly dependent on the particle size, particle size distribution, crystallinity and purity of the materials. The Li1.02Ni0.5Mn1.5O4materials synthesized both at 800 and 850°C have shown best electrochemical performance in terms of capacity and capacity retention between 3.5 and 4.9V with a LiPF6based electrolyte.