NiSb2 as negative electrode for Li-ion batteries: An original conversion reaction
NiSb2 as negative electrode for Li-ion batteries: An original conversion reaction
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DOI：
10.1016/j.jpowsour.2007.06.256
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发表时间：
2007-10
影响因子：
9.2
通讯作者：
C. Villevieille;C. Ionica-Bousquet;Bernard Ducourant-;J. Jumas;L. Monconduit
中科院分区：
文献类型：
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作者：
C. Villevieille;C. Ionica-Bousquet;Bernard Ducourant-;J. Jumas;L. Monconduit
本文研究了锂与NiSb2金属间化合物的电化学反应机理。提出了用经典陶瓷法制备二锑化镍作为锂离子电池正极材料的可能性。对NiSb2和Li+/Li0的电化学表征表明，每个公式单位可逆吸收5个锂，在平均电位0.9V时，可逆容量为500mAhg−1。X射线衍射谱和~(121)Sb穆斯堡尔谱表明，在首次放电过程中，正交相NiSb_2经历了一个纯的转变过程(NiSb_2+6Li++6e，−→，Ni_0+2Li_3Sb)。在随后的充电过程中，复合电极中的锂通过原始的转化过程进行提取，导致高压NiSb2晶型的形成。这种高度可逆的机制使其有可能在15次循环后保持100%的比容量。
The study of the electrochemical reaction mechanism of lithium with NiSb2intermetallic material is reported here. The nickel diantimonide prepared by classic ceramic route is proposed as possible candidate for anodic applications in Li-ion batteries. The electrochemical characterisation of NiSb2versus Li+/Li0shows a reversible uptake of 5 lithium per formula unit, which leads to reversible capacities of 500mAhg−1at an average potential of 0.9V. From ex situ XRD and121Sb Mössbauer measurements it was shown that during the first discharge the orthorhombic NiSb2phase undergoes a pure conversion process (NiSb2+6 Li++6e−→Ni0+2Li3Sb). During the charge process that follows, the lithium extraction from the composite electrode takes place through an original conversion process, leading to the formation of the high pressure NiSb2polymorph. This highly reversible mechanism makes it possible to sustain 100% of the specific capacity after 15 cycles.