Dual yolk-shell structure of carbon and silica-coated silicon for high-performance lithium-ion batteries.
Dual yolk-shell structure of carbon and silica-coated silicon for high-performance lithium-ion batteries.
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DOI：
10.1038/srep10908
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发表时间：
2015-06-03
影响因子：
4.6
通讯作者：
Lei M
中科院分区：
文献类型：
--
作者：
Yang LY;Li HZ;Liu J;Sun ZQ;Tang SS;Lei M
近年来，硅电池由于其高理论容量而备受关注，尽管通常会观察到容量快速衰减，这主要归因于锂化过程中的体积膨胀。在这里，我们首次报道了 Si/void/SiO2/void/C 纳米结构的成功合成。合成策略仅涉及用氢氟酸溶液选择性蚀刻Si/SiO2/C结构中的SiO2。与报道的结果相比，这种新颖的结构包括硬质二氧化硅涂层、导电碳涂层和两个内部空隙空间。在该结构中，碳可以增强导电性，SiO2层具有坚固的机械性能，两个内部空隙空间可以限制和容纳硅在锂化过程中的体积膨胀。因此，这些特殊设计的双蛋黄-壳结构在430次循环后表现出稳定的高容量，达到956 mA h g−1，容量保持率为83%，而Si/C核-壳结构的容量在相同实验条件下的前10次循环中迅速下降。为硅开发的新型双蛋黄壳结构也可以扩展到其他体积变化较大的电池材料。
Silicon batteries have attracted much attention in recent years due to their high theoretical capacity, although a rapid capacity fade is normally observed, attributed mainly to volume expansion during lithiation. Here, we report for the first time successful synthesis of Si/void/SiO2/void/C nanostructures. The synthesis strategy only involves selective etching of SiO2 in Si/SiO2/C structures with hydrofluoric acid solution. Compared with reported results, such novel structures include a hard SiO2-coated layer, a conductive carbon-coated layer, and two internal void spaces. In the structures, the carbon can enhance conductivity, the SiO2 layer has mechanically strong qualities, and the two internal void spaces can confine and accommodate volume expansion of silicon during lithiation. Therefore, these specially designed dual yolk-shell structures exhibit a stable and high capacity of 956 mA h g−1 after 430 cycles with capacity retention of 83%, while the capacity of Si/C core-shell structures rapidly decreases in the first ten cycles under the same experimental conditions. The novel dual yolk-shell structures developed for Si can also be extended to other battery materials that undergo large volume changes.
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影响因子：
16.6
作者：
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通讯作者：
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影响因子：
17.1
作者：
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影响因子：
17.6
作者：
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通讯作者：
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影响因子：
16.6
作者：
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通讯作者：
Maier, Joachim
DOI：
10.1016/j.physe.2005.12.030
发表时间：
2006-05-01
影响因子：
3.3
作者：
Meier, C;Lüttjohann, S;Wiaers, H
通讯作者：
Wiaers, H