کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6472728 | 1424135 | 2016 | 5 صفحه PDF | دانلود رایگان |
- The Li1/3Mn2/3-substitution Na0.74CoO2 materials are prepared by sol-gel method.
- The Li1/3Mn2/3 substitution suppresses phase transformation in intercalation process.
- The Li1/3Mn2/3-substitution electrode exhibits excellent rate capability.
Na0.74(Li1/3Mn2/3)xCo1-xO2 (x = 0, 1/6, 1/3, 1/2) as sodium-ion battery cathode materials are prepared by using sol-gel method. The XRD tests demonstrate that Na0.74CoO2 and its Li1/3Mn2/3-substituted samples possess typical P2 structure. The charging/discharging tests exhibit that the Na0.74CoO2 electrode has a reversible capacity of 131 mAh gâ1 with good cycling performance. When Co is partially substituted by Li1/3Mn2/3, the Li1/3Mn2/3-substituted samples exhibit decreasing reversible capacity of 122, 115, 83 mAh gâ1 for x = 1/6, 1/3, 1/2, respectively. However, the rate capability of the Li1/3Mn2/3-substituted samples is greatly improved due to the suppression of the complicated phase conversion in intercalation process. Moreover, the structure stability for Li1/3Mn2/3-substituted samples is apparently observed when cycled between 4.5 and 2.0 V. Therefore, the substitution of Li1/3Mn2/3 can suppress the complex phase changes of the Na-based oxides and improve their electrochemical performance, which can provide a promising choose for high-performance Na-ion storage cathode material.
The Li1/3Mn2/3-substituted Na0.74(Li1/3Mn2/3)xCo1-xO2 are prepared by by using sol-gel method. The Li1/3Mn2/3-substituted electrodes exhibit excellent rate capability (a reversible capacity of 80 mAh gâ1 at 10C when x = 1/3), which results from the suppression of phase transformation in intercalation process. The Li1/3Mn2/3-substituted electrodes possibly serve as a promising high capacity, stable cathode material and excellent rate capability for sodium ion battery applications.171
Journal: Electrochimica Acta - Volume 222, 20 December 2016, Pages 862-866