分散剂对喷雾干燥制备硅/鳞片石墨/热解炭复合负极材料的影响

摘要

Silicon/flake graphite/carbon (Si/FG/C) composites were synthesized with different dispersants via spray drying and subsequent pyrolysis,and effects of dispersants on the characteristics of the composites were investigated.The structure and properties of the composites were determined by X-ray diffractometry (XRD),scanning electron microscopy (SEM) and electrochemical measurements.The results show that samples have silicon/flake graphite/amorphous carbon composite structure,good spherical appearances,and better electrochemical performance than pure nano-Si and FG/C composites.Compared with the Si/FG/C composite using washing powder as dispersant,the Si/FG/C composite using sodium dodecyl benzene sulfonate (SDBS) as dispersant has better electrochemical performance with a reversible capacity of 602.68 mA·h/g,and a capacity retention ratio of 91.58 ％ after 20 cycles.%采用喷雾干燥及热解法制备硅/鳞片石墨/热解炭复合负极材料,研究分散剂对材料的影响.材料结构与性能通过XRD、SEM及电化学测试来表征.实验结果表明:材料具有硅/鳞片石墨/热解炭复合结构及规则的球形表面,其电化学性能比纯硅有明显的改善.与采用洗衣粉作为分散剂制备的复合材料相比,采用SDBS作为分散剂制备的复合材料具有更好的电化学性能,其可逆比容量达到602.68 mA·h/g,经20次循环后容量保持率高达91.58％.