Abstract Silicon-based anode material is one of the most promising alternative anodes for graphite due to its advantages of abundant reserves, environmental protection and high-energy-density. However, silicon still cannot be directly applied commercially as anode materials owing to the existences of huge volume change during the alloying and dealloying process. Herein, porous Si@C composites are prepared by employment of nano silicon as the active substance particles, lithium chloride as the template and pitch powder as the carbon precursor. Results of electrochemical performance tests show that the cell based on the in-situ prepared porous Si@C composites deliver a reversible good cycle stability. Besides, porous Si@C composites show a lower thickness expansion rate of electrode (15.38%), compared with pure nano silicon (162.46%) and conventional Si@C anodes (40.24%), respectively. It is believed that the improved performance is benefitted from the porous structure, which provides a buffer for the expansion of silicon, reduces the volume expansion of the electrode during the charge and discharge process, and thus inhibits the damage to the solid electrolyte interphase film outside the Si@C composites. This work provides an environmentally friendly method to prepare porous Si@C composite anode materials, which is suitable for large-scale preparation and industrialized production.

中文翻译：

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用 LiCl 模板原位构建多孔 Si@C 复合材料以提供硅阳极膨胀缓冲

摘要 硅基负极材料具有储量丰富、环保、能量密度高等优点，是最有前景的石墨替代负极材料之一。然而，由于合金化和脱合金过程中存在巨大的体积变化，硅仍然不能直接作为负极材料在商业上应用。以纳米硅为活性物质颗粒，氯化锂为模板，沥青粉为碳前驱体，制备多孔Si@C复合材料。电化学性能测试结果表明，基于原位制备的多孔 Si@C 复合材料的电池具有可逆的良好循环稳定性。此外，与纯纳米硅（162.5%）相比，多孔 Si@C 复合材料的电极厚度膨胀率（15.38%）较低。46%）和传统的 Si@C 阳极（40.24%）。认为性能的提高得益于多孔结构，它为硅的膨胀提供了缓冲，减少了电极在充放电过程中的体积膨胀，从而抑制了外部固体电解质界面膜的损伤。 Si@C 复合材料。该工作为制备多孔Si@C复合负极材料提供了一种环境友好的方法，适合大规模制备和工业化生产。从而抑制对 Si@C 复合材料外的固体电解质界面膜的破坏。该工作为制备多孔Si@C复合负极材料提供了一种环境友好的方法，适合大规模制备和工业化生产。从而抑制对 Si@C 复合材料外的固体电解质界面膜的破坏。该工作为制备多孔Si@C复合负极材料提供了一种环境友好的方法，适合大规模制备和工业化生产。