CAJ | 학술논문

利用气相沉积技术,制备了Six Cy层和C层相间的硅碳复合薄膜材料.XRD测试和Raman光谱测试表明,该硅碳复合薄膜材料具有纳米微晶结构.电化学性能测试表明,该SixCy/C复合薄膜材料,具有较低的充放电平台(0.5 V以下),对应的首次放电容量达1 200 mAh/g以上,经过200次循环,容量保持率高于85%.Six Cy/C复合薄膜材料性能的改善,主要原因可能源于活性材料Si中的缓冲骨架以及碳的共同作用,它们的存在改善了复合材料的导电性能,也有效缓冲了在充放电过程中活性组分Si所导致的体积变化.
이용기상침적기술,제비료Six Cy층화C층상간적규탄복합박막재료.XRD측시화Raman광보측시표명,해규탄복합박막재료구유납미미정결구.전화학성능측시표명,해SixCy/C복합박막재료,구유교저적충방전평태(0.5 V이하),대응적수차방전용량체1 200 mAh/g이상,경과200차순배,용량보지솔고우85%.Six Cy/C복합박막재료성능적개선,주요원인가능원우활성재료Si중적완충골가이급탄적공동작용,타문적존재개선료복합재료적도전성능,야유효완충료재충방전과정중활성조분Si소도치적체적변화.
Silicon-carbon composite film was prepared with vapor deposition technology. The measurements of XRD and Raman spectroscopy indicate that the Six Cy/C composite film has nano-microcrystalline structure. The results of electrochemical test indicate that the Six Cy/C composite film deposited on Cu foil has low plateau during charge and discharge (below 0.5 V vs. Li+ / Li), the corresponding discharge capacity reaches 1 200 mAh/g, and the capacity retention is 85% after 200 cycles. The improvement of the electrochemical performance of the Six Cy/C composite film contributes to the buffer framework and doping C element, which improves the conductivity of the composite and effectively buffer the volume change induced by Li insertion/ extraction.