CAJ | 학술논문

采用球磨-热解工艺制备了 Si/C 复合负极材料。研究了球磨时间对 Si/C 复合负极材料结构和电化学性能的影响,并分析了电极的失效机理。研究结果表明,通过球磨可以将纳米硅颗粒均匀分散于石墨基体材料表面,同时,葡萄糖热解后形成的无定形碳使两者紧密结合。球磨3 h 合成的材料具有最优的电化学性能。以100 mA/g的电流密度放电,首次放电容量达到1340 mAh/g,首次充放电效率为75.6%,循环50次后,容量保持率为34.2%。
채용구마-열해공예제비료 Si/C 복합부겁재료。연구료구마시간대 Si/C 복합부겁재료결구화전화학성능적영향,병분석료전겁적실효궤리。연구결과표명,통과구마가이장납미규과립균균분산우석묵기체재료표면,동시,포도당열해후형성적무정형탄사량자긴밀결합。구마3 h 합성적재료구유최우적전화학성능。이100 mA/g적전류밀도방전,수차방전용량체도1340 mAh/g,수차충방전효솔위75.6%,순배50차후,용량보지솔위34.2%。
The composites as anode materials were fabricated by ball milling and thermal decomposition.The influence of ball milling time on the structure and electrochemical performance of Si/C composites was investigated,and the failure mechanism of this Si/C electrode was also analyzed.The research results show that nano silicon particles can be homogeneously dispersed on the surface of the graphite base material though ball milling,at the same time, amorphous carbon obtained from glucose can makes them closely combined after thermal decomposition.The compo-site prepared by ball milling for 3 h shows the best electrochemical properties.The first discharge capacity of Si/C composites can reach 1340 mAh/g at 100 mA/g,and its first charge/discharge efficiency is 75.6%.After 50 cycles, the capacity retention rate is 34.2%.