双金属(Sn/Ni)掺杂多孔硅微球的液相合成与电化学储锂性能

使用廉价的硅铝合金前驱体，通过简单的化学沉积方法制备了新型双金属(Sn/Ni)掺杂多孔硅微球(pSi@SnNi)。pSi@SnNi复合材料的三维多孔结构可以缓冲硅在锂化过程中的巨大体积膨胀，增加储锂活性位点。双金属(Sn/Ni)的掺杂可以提高硅的电子导电性，改进pSi的结构稳定性。由于其独特的组成和微观结构，具有适当Sn/Ni含量的pSi@SnNi复合材料显示了较大的可逆储锂容量(0.1 A·g^-1下为2 651.7 mAh·g^-1)、较高的电化学循环稳定性(1 A·g^-1下400次循环后为1 139 mAh·g^-1)和优异的倍率性能(2.5 A·g^-1下为1 235.8 mAh·g^-1)。

Solution-phase synthesis of bimetallic (Sn/Ni) doped porous silicon microspheres with electrochemical lithium storage

Novel bimetallic (Sn/Ni) doped porous silicon microspheres (pSi@SnNi) were prepared by a simple chemical deposition method, using an inexpensive silicon-aluminum alloy precursor. The three-dimensional porous structure of pSi@SnNi composites can buffer the huge volume expansion of silicon in the lithiation process and increase lithium storage active sites. The deposition and doping of bimetallic (Sn/Ni) may improve the electronic conductivity of Si as well as enhance the structural stability of pSi. Profiting from the unique composition and microstructure, the pSi@SnNi composite with moderate Sn/Ni content showed large reversible lithium storage capacity (2 651.7 mAh· g^-1 at 0.1 A·g^-1), high electrochemical cycling stability (1 139 mAh·g^-1 after 400 cycles at 1 A·g^-1), and excellent rate capability (1 235.8 mAh·g^-1 at 2.5 A·g^-1).