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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Nanostructured siiicon/porous carbon spherical composite as a high capacity anode for Li-ion batteries
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Nanostructured siiicon/porous carbon spherical composite as a high capacity anode for Li-ion batteries

机译：纳米结构硅/多孔碳球形复合材料，作为锂离子电池的高容量阳极

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摘要

A nanostructured silicon/porous carbon spherical composite was prepared by a simple hydrothermal method using glucose as a carbon source and Pluronic F127 as a soft template/pore forming agent in the presence of silicon nanopartlcles, and a subsequent carbonization process. In this composite, silicon nanoparticles were individually and separately coated with a porous carbon shell with a thickness of 15-20 nm and a pore size of 3-5 nm. The composite electrode exhibited excellent cycling stability and rate capability, delivering a stable capacity of 1607 mA h g~(-1) at a current density of 0.4 A g~(-1) after 100 cycles, and a reversible capacity of 1050 mA h g~(-1) even at a high current density of 10 A g~(-1) Detailed analysis of cyclic voltammetry and electrochemical Impedance spectroscopy revealed that the composite showed favorable electrochemical kinetics due to the nano-sized porous carbon shell, which facilitated the formation of a solid electrolyte interface film and the transportation of Li ions and electrons, and decreased the charge transfer resistance, thus significantly improving the electrochemical performance compared with the bare nano-Si electrode.
机译：通过简单的水热法，使用葡萄糖作为碳源，使用Pluronic F127作为软模板/孔形成剂，在硅纳米颗粒的存在下，通过简单的水热法制备了纳米结构的硅/多孔碳球形复合材料，随后进行了碳化过程。在该复合材料中，硅纳米颗粒分别和分别涂覆有厚度为15-20 nm，孔径为3-5 nm的多孔碳壳。该复合电极具有出色的循环稳定性和倍率性能，经过100次循环后，在0.4 A g〜（-1）的电流密度下可提供1607 mA hg〜（-1）的稳定容量，以及1050 mA hg〜的可逆容量。 （-1）即使在10 A g〜的高电流密度下（-1）循环伏安法和电化学阻抗谱的详细分析显示，由于纳米级多孔碳壳，复合材料显示出良好的电化学动力学，促进了形成与裸露的纳米硅电极相比，固体电解质界面膜的导电性和锂离子和电子的传输降低了电荷转移电阻，从而显着提高了电化学性能。

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