Synthesis of porous Si/graphite/carbon nanotubes@C composites as a practical high-capacity anode for lithium-ion batteries
Synthesis of porous Si/graphite/carbon nanotubes@C composites as a practical high-capacity anode for lithium-ion batteries
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DOI：
10.1016/j.matlet.2017.04.057
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发表时间：
2017-07
影响因子：
3
通讯作者：
Yong Yang;Zhixing Wang;Yu Zhou;Huajun Guo;Xinhai Li
中科院分区：
文献类型：
--
作者：
Yong Yang;Zhixing Wang;Yu Zhou;Huajun Guo;Xinhai Li
合成一种实用、高容量、稳定的硅基负极材料仍存在一些挑战。本文报道了一种由纳米硅(获得高容量)、石墨(获得稳定结构)、碳纳米管(增加电子传导性)和沥青(多孔结构和粘结剂)组成的多孔硅基复合材料。然后对复合材料中沥青的含量进行了优化。炭化沥青含量为11.5%的复合材料具有优异的电化学性能。在100mA/−时，首次可逆容量为863.2 mA/−，100次循环后容量保持率为81.3%。该复合材料还具有良好的倍率性能，在1A g−1下可回收89.3%的可逆容量。
There are still several challenges to synthesize a practical, high capacity and stable Si-based anode materials. Here we report a porous Si-based composites, which consists of nano silicon (obtaining high capacity), graphite (gaining stable structure), carbon nanotube (increasing electron conductivity), and pitch (porous structure as well as a binder), by spray-drying method. We then optimize the content of pitch in the composites. The composite with 11.5 wt% carbonized pitch delivers excellent electrochemical performance. It shows an initial reversible capacity of 863.2 mAh g−1at 100 mA g−1, and exhibits capacity retention of 81.3% after 100 cycles. The composite also possesses good rate capability, and up to 89.3% of the reversible capacity can be recovered at 1 A g−1.