Nanostructured silicon/silicide/carbon composite anodes with controllable voids for Li-ion batteries
Nanostructured silicon/silicide/carbon composite anodes with controllable voids for Li-ion batteries
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DOI：
10.1016/j.matdes.2017.02.018
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发表时间：
2017-04
影响因子：
8.4
通讯作者：
Inyeong Kang;Juyoung Jang;Moon-soo Kim;J. W. Park;J. Kim;Y. Cho
中科院分区：
文献类型：
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作者：
Inyeong Kang;Juyoung Jang;Moon-soo Kim;J. W. Park;J. Kim;Y. Cho
以硅铁、氯化钠和聚糠醇（PFA）树脂为起始材料，制备了具有可控空隙的三维（3D）碳网络支撑的硅/硅化物纳米复合阳极。对微观结构和相组成的分析证实了 NaCl 的完全去除以及随后形成的由玻璃碳网络支撑的空隙，存在于纳米结构的硅/硅化物复合颗粒之间。硬币半电池测试表明，与没有可控空隙的合金粉末相比，Si/硅化物/碳纳米复合材料的循环性能显着提高。由具有空隙的涂层合金制备的电极在 100 个循环后仍保持其初始容量的约 66%，并且其库仑效率在几个循环后迅速增加至 99%。
Three-dimensional (3D) carbon-network-supported Si/silicide nanocomposite anodes with controllable voids are prepared using ferrosilicon, NaCl, and polyfurfuryl alcohol (PFA) resin as the starting materials. Analysis of the microstructures and the phase compositions confirms the complete removal of NaCl and the consequent formation of voids supported by a glassy carbon network, residing in between the nanostructured Si/silicide composite particles. Coin-half cell tests demonstrate the significantly improved cycling performance of the Si/silicide/carbon nanocomposites compared with that of the alloy powder without controllable voids. The electrode prepared from the coated alloy with voids maintains approximately 66% of its initial capacity after 100 cycles and its Coulombic efficiency rapidly increases to 99% after several cycles.