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首页> 外文期刊>RSC Advances >Electrochemical properties of a silicon nanoparticle/hollow graphite fiber/carbon coating composite as an anode for lithium-ion batteries
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Electrochemical properties of a silicon nanoparticle/hollow graphite fiber/carbon coating composite as an anode for lithium-ion batteries

机译：硅纳米粒子/空心石墨纤维/碳涂层复合材料作为锂离子电池阳极的电化学性能

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Herein, a double strategy to modify the cycling performance of pure silicon nanoparticles (SiPs) was applied. Hollow graphite fibers (HGFs) with a good graphite structure could improve the electrical conductivity of the electrode. The SiP/HGF composite maintained a discharge capacity of 556.2 mA h g?1 and a charge capacity of 548.6 mA h g?1 after 50 cycles at the current density of 50 mA g?1, which obviously promoted the lifetime as compared to that of the anode of pure SiPs. Carbon coating could minimize the direct contact between the SiPs and electrolyte and buffer the volume changes during cycling. The silicon nanoparticle/hollow graphite fiber/carbon-coated (SiP/HGF/C) composite delivered the initial discharge and charge capacities of 1327.2 and 936.6 mA h g?1, respectively, at a current density of 50 mA g?1. After the first cycle, the charge capacity began to steadily increase to 1122.7 mA h g?1 until the thirty-first cycle. The double strategy effectively buffered the volume changes, enhanced the intensity of the electrode, and improved the overall electrical conductivity during discharge–charge cycles. The low-cost SiP/HGF/C composite showed an optimized electrochemical performance as compared to the pure SiP anode.
机译：在本文中，应用了双重策略来改变纯硅纳米颗粒（SiPs）的循环性能。具有良好石墨结构的空心石墨纤维（HGF）可以改善电极的导电性。 SiP / HGF复合材料的放电容量保持为556.2 mA hg ？1 ，充电容量为548.6 mA hg ？1 < / small>经过50次循环后，电流密度为50 mA g ？1 ，与纯SiPs阳极相比，寿命明显延长。碳涂层可以最大程度地减少SiP与电解质之间的直接接触，并缓冲循环过程中的体积变化。硅纳米颗粒/中空石墨纤维/碳涂层（SiP / HGF / C）复合材料的初始放电和充电容量分别为1327.2和936.6 mA hg ？1 ，电流密度为50 mA g ？1 。在第一个循环之后，充电容量开始稳定增加至1122.7 mA h g ？1 ，直到第31个循环。双重策略有效地缓冲了体积的变化，增强了电极的强度，并改善了充放电循环期间的整体电导率。与纯SiP阳极相比，低成本SiP / HGF / C复合材料具有最佳的电化学性能。

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