Investigation of sodium content on the electrochemical performance of the Nax(Fe0.35Mn0.35Co0.3)O2 (x = 0.5, 0.6, 0.7, 0.8, 0.9) for sodium-ion batteries
Investigation of sodium content on the electrochemical performance of the Nax(Fe0.35Mn0.35Co0.3)O2 (x = 0.5, 0.6, 0.7, 0.8, 0.9) for sodium-ion batteries
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DOI：
10.1007/s11581-019-03211-1
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发表时间：
2019-08
期刊：
影响因子：
2.8
通讯作者：
Serap Gençtürk;D. Uzun;Serkan Yeşilot
中科院分区：
文献类型：
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作者：
Serap Gençtürk;D. Uzun;Serkan Yeşilot
采用溶胶-凝胶法合成了一系列不同Na含量的P2型和O3型Nax（Fe0.35Mn0.35Co0.3）O2（x= 0.5，0.6，0.7，0.8，0.9）。通过X射线衍射对新制备的材料进行了检验。通过扫描电子显微镜（SEM-EDS）和电感耦合等离子体质谱（ICP-OES）对其进行了表征。研究了这些材料的电化学性能，以了解Na含量的影响。P2型Na0.5（Fe0.35Mn0.35Co0.3）O2在0.05 C下的初始放电容量为122.5 mAh g−1，Na0.6（Fe0.35Mn0.35Co0.3）O2为114.7 mAh g−1，Na0.7（Fe0.35Mn0.35Co0.3）O2为136.5 mAh g− 1。在这些材料的110次循环后，在0.05 C下的放电容量分别下降到55.6 mAh g-1、71.2 mAh g-1和89.0 mAh g-1。O3型Na0.8（Fe0.35Mn0.35Co0.3）O2和Na0.9（Fe0.35Mn0.35Co0.3）O2在0.05 C下的初始放电容量分别为145.6 mAh g− 1和120.2 mAh g− 1。在这些材料的110次循环后，在0.05 C下的放电容量分别下降到94.2 mAh g-1和24.95 mAh g-1。根据这些结果，P2型的Nax（Fe0.35Mn0.35Co0.3）O2（x= 0.5、0.6、0.7）比O3型的Nax（Fe0.35Mn0.35Co0.3）O2（x= 0.8、0.9）具有更高的循环稳定性。
A series of different Na content P2- and O3-type Nax(Fe0.35Mn0.35Co0.3)O2(x= 0.5, 0.6, 0.7, 0.8, 0.9) were successfully synthesized by sol-gel method. The newly prepared materials were examined by means of X-ray diffraction. They were characterized by scanning electron microscopy (SEM-EDS) and inductively coupled plasma mass spectrometry (ICP-OES). The electrochemical performances of these materials were studied to understand the effect of the Na content. The initial discharge capacities of P2-type Na0.5(Fe0.35Mn0.35Co0.3)O2is 122.5 mAh g−1, Na0.6(Fe0.35Mn0.35Co0.3)O2is 114.7 mAh g−1, and Na0.7(Fe0.35Mn0.35Co0.3)O2is 136.5 mAh g−1at 0.05 C. After 110 cycles of these materials, the discharge capacities dropped to 55.6 mAh g−1, 71.2 mAh g−1, and 89.0 mAh g−1at 0.05 C, respectively. The initial discharge capacities of O3-type Na0.8(Fe0.35Mn0.35Co0.3)O2and Na0.9(Fe0.35Mn0.35Co0.3)O2are 145.6 mAh g−1and 120.2 mAh g−1at 0.05 C, respectively. After 110 cycles of these materials, the discharge capacities dropped to 94.2 mAh g−1and 24.95 mAh g−1at 0.05 C, respectively. Given these results, P2-type Nax(Fe0.35Mn0.35Co0.3)O2(x= 0.5, 0.6, and 0.7) have higher cycling stability than the O3-type Nax(Fe0.35Mn0.35Co0.3)O2(x= 0.8 and 0.9).