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Scalable synthesis of carbon stabilized SiO/graphite sheets composite as anode for high-performance Li ion batteries

机译：碳稳定的SiO /石墨片复合材料作为高性能锂离子电池阳极的可扩展合成

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Mixing Si-based materials with graphite has attracted attention as a feasible alternative anode for practical application in high-energy Li-ion batteries. In this study, amorphous carbon coated SiO/graphite composites (SGCs) are fabricated through in situ polymerization of aniline and followed by annealing treatment, which is simple and scalable. The in situ generated polyaniline serves as a “glue” to stabilize the SiO particles and graphite sheets, thus constructing well-distributed and stable structure. After annealing, the polyaniline-derived carbon layer and graphite could synergistically buffer the volume change of SiO, and form a conductive network. The effect of the weight ratio of SiO and graphite on the overall electrochemical performance is also studied. As a result, the optimized SGC-5 anode (weight ratio: SiO/graphite = 1/5) exhibits the best electrochemical performance, such as a reversible capacity over 540 mA h g?1 at 0.2C, long-term cycling stability with a capacity of 440 mA h g?1 at 0.8C after 500 cycles, and good rate capability. Additionally, the structural change and fading mechanism of these electrodes during cycling are also investigated.
机译：将硅基材料与石墨混合作为高能量锂离子电池实际应用中可行的替代阳极引起了关注。在这项研究中，通过苯胺的原位聚合并随后进行退火处理来制备无定形碳包覆的SiO /石墨复合材料（SGC），该方法简单且可扩展。 原位生成的聚苯胺用作稳定SiO颗粒和石墨片的“胶水”，从而构建分布均匀且稳定的结构。退火后，聚苯胺衍生的碳层和石墨可以协同缓冲SiO的体积变化，并形成导电网络。还研究了SiO和石墨的重量比对整体电化学性能的影响。结果，优化的SGC-5阳极（重量比：SiO /石墨= 1/5）表现出最佳的电化学性能，例如在540 mA hg ？1 < / small>在0.2C下具有500个循环，在0.8C下具有440 mA hg ？1 的长期循环稳定性，并且具有良好的倍率性能。另外，还研究了这些电极在循环过程中的结构变化和褪色机理。

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