Ultrafast synthesis of graphene nanosheets encapsulated Si nanoparticles via deflagration of energetic materials for lithium-ion batteries
Ultrafast synthesis of graphene nanosheets encapsulated Si nanoparticles via deflagration of energetic materials for lithium-ion batteries
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通过锂离子电池含能材料的爆燃超快合成封装硅纳米颗粒的石墨烯纳米片
DOI：
10.1016/j.nanoen.2019.104028
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发表时间：
2019-11
期刊：
影响因子：
17.6
通讯作者：
He Chuan
中科院分区：
文献类型：
--
作者：
Yang Min;Liu Jinxu;Li Shukui;Zhang song;Wang yingchun;He Chuan
将硅颗粒包裹在导电层中已被证明是在循环过程中保持硅高容量的有效途径。在这里，我们通过硅聚四氟乙烯(PTFE)含能材料的核壳结构设计，展示了一种以微米级聚四氟乙烯(PTFE)和硅颗粒为原料，自顶向下大规模直接制备石墨烯纳米片包覆硅纳米颗粒(GrSiNPs)的方法。在爆燃时，PTFE和Si之间的放热反应的高温和高压导致Si核被破碎成纳米粒子，在此过程中实现了Si纳米粒子与石墨烯纳米片的伴随包覆。在400 mA g−1电流密度下循环6个月，800次循环后的比容量为1613mAHg−1，平均库仑效率为101 ± 2%。我们的研究为高性能锂离子电池核壳结构石墨烯-硅纳米复合材料的大规模生产提供了一条有希望的途径。
Encapsulating silicon particles in conductive layers has proven to be an effective route to retain the high capacity of silicon during cycling. Here, through a core-shell structural design of silicon-polytetrafluoroethylene (PTFE) energetic materials, we demonstrate a large-scale top-down approach for directly obtaining graphene nanosheets encapsulated Si nanoparticles (GrSiNPs) using micrometer-sized PTFE and Si particles as low-cost starting materials. Upon deflagration, high temperature and high pressure of the exothermic reaction between PTFE and Si lead to the fragmentation of the Si core into nanoscale particles, during which the concomitant coating of the Si nanoparticles with graphene nanosheets is achieved. Repeated cycling at a current density of 400 mA g−1for 6 months, the GrSiNPs demonstrate a high specific capacity of 1613 mAh g−1after 800 cycles and the average Coulombic efficiency is 101 ± 2%. Our study provides a promising route to the mass production of core-shell structured graphene-Si nanocomposites for high-performance lithium-ion batteries.
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