阴极
化学
钠
兴奋剂
离子
分析化学(期刊)
锂(药物)
电流密度
衍射
材料科学
光电子学
物理化学
有机化学
内分泌学
物理
光学
医学
量子力学
色谱法
作者
Huidan Hou,Baoheng Gan,Yudong Gong,Ning Chen,Chunwen Sun
出处
期刊:Inorganic Chemistry
[American Chemical Society]
日期:2016-08-11
卷期号:55 (17): 9033-9037
被引量:104
标识
DOI:10.1021/acs.inorgchem.6b01515
摘要
There is intense interest in sodium-ion batteries as an alternative to lithium-ion batteries for electric storage applications because of the low-cost and abundant sodium resources. Na0.67Ni0.33-xMgxMn0.67O2 compounds (x = 0, 0.02, 0.05, 0.1, or 0.15) were prepared by a sol-gel method and used as a cathode for sodium-ion batteries. The X-ray powder diffraction measurements demonstrated that the obtained samples have a pure P2 phase. Na0.67Ni0.23Mg0.1Mn0.67O2 delivers an initial reversible capacity of 105 mAh g(-1) in the potential region from 2.0 to 4.5 V at a charge/discharge current density of 48 mA g(-1). Moreover, the cyclability is improved by doping Mg. The capacity of Na0.67Ni0.23Mg0.1Mn0.67O2 can remain at approximately 84.9 mAh g(-1) at a current density of 48 mA g(-1) after 100 cycles. The improved high rate performance of Na0.67Ni0.23Mg0.1Mn0.67O2 was attributed to the increased lattice parameters and d spacing of the Na(+) layer. Therefore, Mg-doped Na0.67Ni0.23Mg0.1Mn0.67O2 is a promising cathode for sodium-ion batteries with excellent rate and cyclic performance.
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