将两款商业化石墨烯材料用于超级电容器中,考察材料的结构特性及应用方式对超级电容器性能的影响。结果表明:对于高比表面积石墨烯材料,因堆叠团聚问题导致极片过于致密,影响电解液渗透和有效利用面积,因此单独作为活性材料使用不能带来性能提升。而高电导率、比表面积适中的石墨烯材料,则适合作为活性炭电极的导电添加剂,可促进电荷传输和电解液离子扩散,提高电极比电容和功率特性;在0.5A/g电流密度下,该电极在有机电解液中的比电容值可达64.7F/g,即使在4A/g的高倍率条件下,性能相比低倍率也未出现明显下降,综合表现优于纯活性炭材料制作的电极。
Two commercialized graphene materials were used in supercapacitor to investigate the effect of their structure and application methods on the supercapacitor performance.The results showed that graphene materials with high specific surface area used as active material had no obvious advantages in performance due to the problems of too dense electrode plate caused by stacking agglomeration,affecting the electrolyte penetration and effective usage of the area.However,graphene materials with high conductivity and moderate specific surface area were suitable for activated carbon electrode using as conductive additives,which can promote the charge transport and electrolyte ion diffusion,improved the specific capacitance and power characteristics of the electrode.The specific capacitance of electrode with graphene addition reached 64.7F/g in organic electrolyte at a current density of 0.5A/g.Even under the high rate of 4A/g,sharp capacitance loss was not observed compared to low rate case.The total performance of graphene-contained electrode was better than that of activated carbon electrode without it.
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基金资助
国家自然科学基金(51102139);深圳科技计划项目(JC201105201100A);深圳市学科布局项目(JCYJ20160301154114273)
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