Enhanced lithium ion battery performance of nano/micro-size Si via combination of metal-assisted chemical etching method and ball-milling
Enhanced lithium ion battery performance of nano/micro-size Si via combination of metal-assisted chemical etching method and ball-milling
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DOI：
10.1016/j.micromeso.2018.03.035
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发表时间：
2018-09
影响因子：
5.2
通讯作者：
Xiangyang Zhou;Song Chen;Haochen Zhou;Jingjing Tang;Yongpeng Ren;T. Bai;Jiaming Zhang;Juan-Yu Yang
中科院分区：
文献类型：
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作者：
Xiangyang Zhou;Song Chen;Haochen Zhou;Jingjing Tang;Yongpeng Ren;T. Bai;Jiaming Zhang;Juan-Yu Yang
到目前为止，在体电极中设计具有高库仑效率和循环稳定性的特殊硅仍然是一个重大挑战。在这项工作中，通过结合改进的金属辅助化学蚀刻（MACE）方法和球磨的简单且可扩展的工艺成功合成了纳米/微米结构硅。采用改进的MACE方法提纯微硅（mSi）并产生多孔结构。此外，我们通过简单的球磨减小多孔硅（pSi）的尺寸并引入氧化层（∼3.8nm）来制备纳米/微米结构硅（M-pSi），其具有高达85.2%的初始库仑效率、高容量和良好的循环性能。 M-pSi在0.2C（1C=4200mAg−1）电流密度下的初始放电容量为2349mAhg−1，经过100次循环后仍保持在2231mAhg−1，表明每个循环平均下降0.05%。即使在 2C 的较高电流密度下，它也能提供 750mAhg−1 的高放电容量。
Up to now, designing special Si with high coulombic efficiency and cycling stability in a bulk electrode remains a significant challenge. In this work, nano/micro-structured Si was successfully synthesized via a simple and scalable process with combination of the modified Metal-assisted chemical etching (MACE) method and ball-milling. The modified MACE method was used to purify micro-silicon (mSi) and produce porous structure. Moreover, we decrease the size of porous Si (pSi) and introduce the oxidation layer (∼3.8 nm) through simple ball-milling to prepare nano/micro-structured Si (M-pSi), which delivers a high initial coulombic efficiency of 85.2%, high capacity and good cycle performance. The initial discharge capacity of M-pSi is 2349 mA h g−1at a current density of 0.2 C (1 C = 4200 mA g−1) and remains 2231 mA h g−1after 100 cycles, suggesting an average decrease of 0.05% per cycle. Even at a higher current density of 2 C, it delivers a high discharge capacity of 750 mA h g−1.