Three-dimensional carbon-coating silicon nanoparticles welded on carbon nanotubes composites for high-stability lithium-ion battery anodes
Three-dimensional carbon-coating silicon nanoparticles welded on carbon nanotubes composites for high-stability lithium-ion battery anodes
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DOI：
10.1016/j.apsusc.2019.02.145
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发表时间：
2019-06-15
影响因子：
6.7
通讯作者：
Chu, Paul K.
中科院分区：
文献类型：
--
作者：
An, Weili;Xiang, Ben;Chu, Paul K.
尽管硅因其高比容量而被认为是下一代锂离子电池的负极材料之一，但其体积效应大，电导率小，阻碍了其商业化应用。以稻壳生物质为纳米硅源(RH-Nano Si)，设计并制备了三维碳杂化纳米Si层状结构复合材料(RH-Nano Si@C/CNT)，通过自静电方法将Si与碳纳米管组装，在葡萄糖溶液中水热处理，在Ar中焙烧，制备了三维碳杂化纳米硅分级结构复合材料(RH-Nano Si@C/CNT)。在RH-Nano Si@C/CNT中，通过焊接和涂层，硅纳米颗粒通过葡萄糖衍生的碳固定在3D有利的碳纳米管网络上，从而提供了更好的电接触和高结构完整性。作为负极材料，RH-Nano Si@C/CNT比Si和CNT自静电样品表现出更高的倍率能力和更长的循环稳定性。该技术制备的RH-纳米Si@C/碳纳米管具有0.5C下989.5 mAHg(-1)的可逆容量(1C=4.2Ag(-1))和345mAHg(-1)的高可逆容量，1000次循环后容量衰减率仅为0.035%，有望作为锂离子电池正极材料。
Although silicon (Si) is regarded as one of promising anode materials in next-generation lithium-ion batteries (LIBs) due to the high specific capacity, commercial application is stifled by the large volume effect and small electric conductivity. Using rice husk (RH) biomass as nano Si source (RH-Nano Si), here we designed and fabricated the three-dimensional (3D) carbon-hybridized nano-Si hierarchical architecture composite (RH-Nano Si@C/CNT) via assembling Si with CNT by the self-electrostatic route, reinforcing by hydrothermal treating in a glucose solution, and calcination in Ar. In RH-Nano Si@C/CNT, the Si nanoparticles are anchored on the 3D conducive CNT network by the glucose-derived carbon through welding and coating, thus providing enhanced electrical contact and high structural integrity. As anode materials, RH-Nano Si@C/CNT exhibits improved rate capability and prolonged cycling stability compared to Si and CNT self-electrostatic sample. Boasting a high reversible capacity of 989.5 mAh g(-1) at 0.5C (1C = 4.2 A g(-1)) and 345 mAh g(-1) at 3C as well as low capacity decay of 0.035% per cycles after 1000 cycles, RH-Nano Si@C/CNT produced by this technique is promising as anodes in LIBs.