Porous Silicon Nanotube Arrays as Anode Material for Li-Ion Batteries
Porous Silicon Nanotube Arrays as Anode Material for Li-Ion Batteries
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DOI：
10.1021/acsami.5b05705
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发表时间：
2015-09-23
影响因子：
9.5
通讯作者：
Djenizian, Thierry
中科院分区：
文献类型：
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作者：
Tesfaye, Alexander T.;Gonzalez, Roberto;Djenizian, Thierry
报道了锂离子电池用具有薄多孔侧壁的硅纳米管垂直阵列的电化学性能。采用牺牲氧化锌纳米线模板法在不锈钢衬底上制备了多孔硅纳米管。这些多孔硅纳米管在多种C速率下都是稳定的。以C/20充放电，二次放电容量为3095mAHg(-1)，库仑效率为63%，循环30次后的稳定重量比容量为1670mAHg(-1)。高容量值归因于3D纳米结构的孔洞提供的大表面积，从而根据伪电容机制促进了锂离子的存储。
We report the electrochemical performance of Si nanotube vertical arrays possessing thin porous sidewalls for Li-ion batteries. Porous Si nanotubes were fabricated on stainless steel substrates using a sacrificial ZnO nanowire template method. These porous Si nanotubes are stable at multiple C-rates. A second discharge capacity of 3095 mAh g(-1) with a Coulombic efficiency of 63% is attained at a rate of C/20 and a stable gravimetric capacity of 1670 mAh g(-1) obtained after 30 cycles. The high capacity values are attributed to the large surface area offered by the porosity of the 3D nanostructures, thereby promoting lithium-ion storage according to a pseudocapacitive mechanism.