Effects of cathode fabrication conditions and cycling on the electrochemical performance of LiNiO2 synthesized by combustion and calcination
Effects of cathode fabrication conditions and cycling on the electrochemical performance of LiNiO2 synthesized by combustion and calcination
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DOI：
10.1016/j.ceramint.2011.01.028
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发表时间：
2011-07
影响因子：
5.2
通讯作者：
S. Kwon;Jihong Song;D. Mumm
中科院分区：
文献类型：
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作者：
S. Kwon;Jihong Song;D. Mumm
采用燃烧法合成了LiNiO 2，其中Li 1 + zNiO 2中的过量锂量z（z=0.04，0.08，0.10，0.12和0.15）不同。当活性物质：乙炔黑：粘结剂=85：10：5时，z=0.10的样品在2.7-4.4V电压范围内，0.1C倍率下首次放电容量最大，达195 mAh/g。LiNiO 2阴极（其中用于合成LiNiO 2的过量锂量z为0.10）以活性材料：乙炔黑：粘合剂的各种重量比（85：10：5、85：12：3和90：7：3）制造。活性物质：乙炔黑：粘结剂为85：10：5时，阴极的电化学性能最好。研究了活性物质：乙炔黑：粘结剂=85：10：5的LiNiO_2正极材料的放电容量-循环次数曲线随C倍率的变化规律。在0.1C倍率下，LiNiO_2的首次放电容量最大，放电容量衰减率为0.70mAh/g/cycle，n=50时的放电容量为134 mAh/g。
LiNiO2was synthesized by the combustion method with various excess lithium amount z in Li1+zNiO2(z=0.04, 0.08, 0.10, 0.12, and 0.15). The sample with z=0.10 has the largest first discharge capacity of 195mAh/g at 0.1C rate and voltage range 2.7–4.4V with the weight ratio of active material:acetylene black:binder=85:10:5. The LiNiO2cathodes, in which the excess lithium amount z for the synthesis of LiNiO2was 0.10, were fabricated with various weight ratios of active material:acetylene black:binder (85:10:5, 85:12:3, and 90:7:3). The cathode with the ratio of active material:acetylene black:binder 85:10:5 has the best electrochemical properties. The variation, with C-rate, of discharge capacity vs. number of cycles curve for the LiNiO2cathode with the weight ratio of active material:acetylene black:binder=85:10:5 was investigated. At 0.1C rate, the LiNiO2cathode has the largest first discharge capacity, the discharge capacity degradation rate of 0.70mAh/g/cycle and a discharge capacity at n=50 of 134mAh/g.