Transition-Metal Carbodiimides as Molecular Negative Electrode Materials for Lithium- and Sodium-Ion Batteries with Excellent Cycling Properties.
Transition-Metal Carbodiimides as Molecular Negative Electrode Materials for Lithium- and Sodium-Ion Batteries with Excellent Cycling Properties.
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DOI：
10.1002/anie.201600098
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发表时间：
2016-04
影响因子：
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通讯作者：
M. Sougrati;A. Darwiche;Xiaohiu Liu;A. Mahmoud;R. Hermann;S. Jouen;L. Monconduit;R. Dronskowski;L. Stievano
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文献类型：
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作者：
M. Sougrati;A. Darwiche;Xiaohiu Liu;A. Mahmoud;R. Hermann;S. Jouen;L. Monconduit;R. Dronskowski;L. Stievano
我们报告了过渡金属碳二亚胺相对于锂和钠的电化学活性的证据。特别是，碳二亚胺铁（FeNCN）可以有效地用作碱金属离子电池的负极材料，类似于其氧化物类似物FeO。基于（57）Fe Mössbauer和红外光谱（IR）数据，电化学反应机理可以通过Fe- ncn在放电和充电过程中可逆转化为Li/Na-NCN键来解释。与成熟的负极参考材料（如石墨或硬碳）相比，这些新的电极材料表现出更高的容量。与其氧化物类似物相反，碳二亚胺铁不需要重处理（如纳米级裁剪，复杂的纹理或涂层）就可以获得长循环寿命，电流密度高达9 g(-1)，可进行数百次充放电循环。与铁化合物类似，其他几种过渡金属碳二亚胺M(x)(NCN)y， M=Mn, Cr， Zn可以成功地与锂和钠循环。它们的电化学活性和性能为设计一种新型阳极材料开辟了道路。
We report evidence for the electrochemical activity of transition-metal carbodiimides versus lithium and sodium. In particular, iron carbodiimide, FeNCN, can be efficiently used as negative electrode material for alkali-metal-ion batteries, similar to its oxide analogue FeO. Based on (57)Fe Mössbauer and infrared spectroscopy (IR) data, the electrochemical reaction mechanism can be explained by the reversible transformation of the Fe-NCN into Li/Na-NCN bonds during discharge and charge. These new electrode materials exhibit higher capacity compared to well-established negative electrode references such as graphite or hard carbon. Contrary to its oxide analogue, iron carbodiimide does not require heavy treatments (such as nanoscale tailoring, sophisticated textures, or coating) to obtain long cycle life with current density as high as 9 A g(-1) for hundreds of charge-discharge cycles. Similar to the iron compound, several other transition-metal carbodiimides M(x)(NCN)y with M=Mn, Cr, Zn can cycle successfully versus lithium and sodium. Their electrochemical activity and performance open the way to the design of a novel family of anode materials.