Synthesis and electrochemical properties of LiNi0.8Co0.15Al0.05O2 prepared from the precursor Ni0.8Co0.15Al0.05OOH
Synthesis and electrochemical properties of LiNi0.8Co0.15Al0.05O2 prepared from the precursor Ni0.8Co0.15Al0.05OOH
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DOI：
10.1016/j.jpowsour.2011.09.101
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发表时间：
2012-01
影响因子：
9.2
通讯作者：
Guo-rong Hu;Wanmin Liu;Zhongdong Peng;K. Du;Yanbing Cao
中科院分区：
文献类型：
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作者：
Guo-rong Hu;Wanmin Liu;Zhongdong Peng;K. Du;Yanbing Cao
以金属硫酸盐溶液为原料，采用共氧化-控制晶化法制备前驱体Ni0.8Co0.15Al0.05OOH，经烧结制备锂离子电池正极材料LiNi0.8Co0.15Al0.05O2。通过TG-DSC分析研究了煅烧温度和时间对材料电化学性能的影响。XRD分析表明，700°C煅烧6 h所得粉体具有最佳的六方层状结构。SEM图像显示，这些粉末为球形颗粒，直径在5-12μm范围内。XPS测试和化学滴定分析表明，这些粉末中的Ni离子均以Ni ~（3+）的形式存在。充放电测试表明，这些粉末具有最好的电化学性能，当在2.8和4.3V之间以0.2C的电流密度循环时，初始放电容量为196.8mAhg− 1，50次循环后的容量保持率为96.1%。此外，这些粉末还表现出优异的倍率性能和高温性能。
LiNi0.8Co0.15Al0.05O2cathode material for lithium-ion batteries is synthesized by sintering the precursor Ni0.8Co0.15Al0.05OOH, which is prepared from the corresponding metal sulphates solution by a co-oxidation-controlled crystallization method. The effects of calcination temperature and time on the electrochemical performance of the material are investigated on the basis of TG-DSC analysis. XRD analyses show that the powders obtained by calcination at 700°C for 6h have the best-ordered hexagonal layer structure. SEM images show that these powders are spherical particles with diameter in the 5–12μm range. The XPS measurement and the chemical titration display that Ni ions of these powders are in the form of Ni3+. The charge–discharge tests demonstrate that these powders have the best electrochemical properties, with an initial discharge capacity of 196.8mAhg−1and capacity retention of 96.1% after 50 cycles when cycled at a current density of 0.2C between 2.8 and 4.3V. Besides, these powders have also exhibited excellent rate capability and high-temperature performance.