Nanosize Si anode embedded in super-elastic nitinol (Ni-Ti) shape memory alloy matrix for Li rechargeable batteries
Nanosize Si anode embedded in super-elastic nitinol (Ni-Ti) shape memory alloy matrix for Li rechargeable batteries
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DOI：
10.1039/c1jm11020a
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发表时间：
2011-01-01
影响因子：
--
通讯作者：
Sohn, Hun-Joon
中科院分区：
文献类型：
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作者：
Jung, Heechul;Kim, Young-Ugk;Sohn, Hun-Joon
采用电弧熔炼-快淬法制备了纳米硅镶嵌超弹性镍钛合金基复合材料。X射线衍射和高分辨率透射电子显微镜与能量色散谱分析证实，约50 nm的硅微晶被包围的Ni-Ti矩阵。非原位同步辐射X射线衍射分析了活性材料在锂化和脱锂过程中的相转变。通过非原位X射线吸收光谱分析研究了Ni-Ti非活性基体在循环过程中的局部结构变化。该阳极材料显示出优异的电化学稳定性，因为非活性镍钛诺基质的弹性行为吸收了由于嵌入的纳米尺寸Si的锂化期间的体积膨胀而产生的应力。
A nanosize Si embedded in super-elastic Nitinol alloy matrix composite was synthesized in large-scale using arc melting followed by a rapid quenching method. Both X-ray diffraction and high resolution transmission electron microscope with energy dispersive spectroscopy analyses confirmed that approximately 50 nm Si crystallites were surrounded by the Ni-Ti matrix. Ex situ synchrotron XRD was performed to elucidate the phase transition of active materials during lithiation and delithiation. The local structural changes of the Ni-Ti inactive matrix during cycling were investigated by ex situ X-ray absorption spectroscopy analyses. This anode material showed an excellent electrochemical stability since the elastic behavior of the inactive Nitinol matrix absorbed the stress generated due to the volume expansion during lithiation of the nanosized Si embedded.