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采用酸浸蚀Al-Si合金的方法制备了多孔纳米Si,并用其制作以石墨烯为导电材料的石墨烯/多孔纳米Si负极.SEM和TEM的分析表明两者混合均匀.作为锂离子电池的负极,该电极在1 mol·L~(-1)Li PF6/EC(碳酸乙烯酯):DMC(碳酸二甲酯)=1:1(by volume)+1.5%(by mass)VC(碳酸亚乙烯酯)溶液中、0.5 A·g~(-1)电流密度下,第120周循环的放电比容量为1842.6 m Ah·g~(-1),库仑效率为98.6%.石墨烯的加入不仅提高了电极的导电性,而且减缓了充放电过程中电极多孔纳米结构的衰变.
Porous nano-Si was prepared by acid etching of Al-Si alloy, and graphene was used as conductive material to prepare graphene / porous Si nano-anode. SEM and TEM analysis showed that the two were mixed uniformly. The negative electrode was prepared in the presence of 1 mol·L -1 LiPF 6 / EC (ethylene carbonate): DMC (dimethyl carbonate) = 1: 1 by volume + 1.5% by mass VC Vinyl acetate), the specific discharge capacity at the 120th cycle was 1842.6 m Ah · g -1 with a Coulombic efficiency of 98.6% at a current density of 0.5 A · g -1. The addition of graphene not only Improve the conductivity of the electrode, and slow down the decay of the porous structure of the electrode during charging and discharging.