Silicon carbon nanoparticles (SCNPs) coated with reduced graphene oxide (rGO) were fabricated by a hydrothermal method and subsequently by a simple heat treatment process. SCNPs/rGO exhibit excellent electrochemical performance which not only attributes the rGO layer to inhibit the volumetric expansion of silicon and reduce the impedance between the active material and lithium ions during the electrochemical process, but also improves the electrical conductivity of SCNPs/rGO. The as-prepared compound was cyclically tested at a current density of 150[Formula: see text]mA/g, with the first charge and discharge capacities of 3152.2[Formula: see text]mAh/g and 3342.7[Formula: see text]mAh/g, respectively. Moreover, the electrochemical performance of SCNPs/rGO was better than SCNPs. The [Formula: see text] values for fresh battery, after 1 cycle and 100 cycles, are 120.9[Formula: see text][Formula: see text], 120.5[Formula: see text][Formula: see text] and 104[Formula: see text][Formula: see text]. Thus, compared with SCNPs, SCNPs/rGO exhibited lower overall impedance values. These results indicate that the addition of graphene layer significantly improved the electrochemical performance of SCNPs electrodes and reduced the internal resistance of the battery.

中文翻译：

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具有高比容量和高倍率性能的还原氧化石墨烯包覆的硅碳纳米粒子作为锂离子电池负极材料

涂有还原氧化石墨烯 (rGO) 的硅碳纳米粒子 (SCNP) 通过水热法和随后的简单热处理工艺制造。SCNPs/rGO表现出优异的电化学性能，这不仅归因于rGO层在电化学过程中抑制硅的体积膨胀并降低活性材料与锂离子之间的阻抗，而且提高了SCNPs/rGO的电导率。将所制备的化合物在150[公式：见文]mA/g的电流密度下循环测试，首次充放电容量为3152.2[公式：见文]mAh/g和3342.7[公式：见文]毫安/克，分别。此外，SCNPs/rGO的电化学性能优于SCNPs。新电池的 [公式：见文本] 值，1个循环和100个循环后，分别为120.9[公式：见文][公式：见文]、120.5[公式：见文][公式：见文]和104[公式：见文][公式：见文]。因此，与 SCNPs 相比，SCNPs/rGO 表现出较低的整体阻抗值。这些结果表明，石墨烯层的加入显着提高了 SCNPs 电极的电化学性能，降低了电池的内阻。