基于二维材料的高能量密度电化学储能器件
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- 英文论文题名：High-Density Energy Storage based on 2D Materials
- 论文作者：杨晓伟
- 英文论文作者：Xiaowei Yang ; School of Materials Science and Engineering ; Tongji University
- 年：2016
- 作者机构：同济大学材料科学与工程学院;
- 论文关键词：石墨烯 ; 二硫化钼 ; 二氧化钛 ; 体积比容量 ; 致密化
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十九分会：纳米碳材料
- 语种：中文
- 分类号：TQ127.11;TM53
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十九分会 ; 纳米碳材料
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：145k
- 原文格式：D
- 会议级别：全国
摘要
研发致密堆积、但能保持较低离子传输阻力的电化学储能材料,对于增加电化学储能系统的能量密度至关重要;但是由于平均孔隙在亚纳米范围内,被证明具有很大挑战。利用化学转化石墨烯内在的自组装行为,我们制备了定向排列的石墨烯水凝胶薄膜,并以此为模板制备了石墨烯复合凝胶薄膜;并在含有非挥发性的液体电解质前提下,我们通过毛细管力压缩自适应的石墨烯水凝胶薄膜,获得了高密度石墨烯复合电极。这种简单的软化学使得石墨烯与电解液能实现亚纳米尺度的整合,以形成高度紧凑、但是具有连续离子传输通道的碳电极。基于此柔性石墨烯薄膜的电化学电容器具有近60 Wh/l的能量密度[1]。石墨烯/二硫化钨凝胶薄膜表现出近1000 F/cm~3的体积比电容[2]。利用化学还原的石墨烯具有的独特表面化学结构,获得石墨烯/氧化钛,展现出高的体积比容量和倍率特性。此外,也采用软化学方法来致密化集成硫和石墨烯,微孔尺度的硫-石墨烯结构可以增加硫和石墨烯间的作用力、更好地固定硫、将多硫化物更有效的限制在紧凑的孔结构中,最终取得高的体积比容量和循环性能[3]。
To develop the energy-storage materials with high density yet low ion-transport impedance is significant for increase the energy density of energy storage system; however, it is very challenging because of the sub-nanometer pores. We prepared the oriented graphene hydrogel films using the self-assembly of reduced graphene oxide colloids, together with the furthermore graphene composite gel films, and finally obtain the high-density graphene composite gel with the capillary force of liquids in the presence of non-volatile electrolyte. This simple soft approach could facilitate the dense and sub-nanotemeter-scale integration of graphene and electrolyte. A high energy density of 60 Wh/l was obtained with this dense yet porous graphene gel films. The dense graphene/MoW_2 delivered the volumetric capacitance as high as 1000 F/cm~3. With the unique interfacial chemical structure of chemically derived graphene, the graphene/TiO_2 could be synthesized, to show a high volumetric capacity and rate performance. Sulfur and graphene were densely integrated using the soft approach. The microporous sulfur-graphene composite could increase the binding force between sulfur and graphene, to better immobilize sulfur and polysulfides.
To develop the energy-storage materials with high density yet low ion-transport impedance is significant for increase the energy density of energy storage system; however, it is very challenging because of the sub-nanometer pores. We prepared the oriented graphene hydrogel films using the self-assembly of reduced graphene oxide colloids, together with the furthermore graphene composite gel films, and finally obtain the high-density graphene composite gel with the capillary force of liquids in the presence of non-volatile electrolyte. This simple soft approach could facilitate the dense and sub-nanotemeter-scale integration of graphene and electrolyte. A high energy density of 60 Wh/l was obtained with this dense yet porous graphene gel films. The dense graphene/MoW_2 delivered the volumetric capacitance as high as 1000 F/cm~3. With the unique interfacial chemical structure of chemically derived graphene, the graphene/TiO_2 could be synthesized, to show a high volumetric capacity and rate performance. Sulfur and graphene were densely integrated using the soft approach. The microporous sulfur-graphene composite could increase the binding force between sulfur and graphene, to better immobilize sulfur and polysulfides.
引文
[1]Yang,X.;Cheng,C.;Wang,Y.;Qiu,L.;Li,D.Science 2013,341:534.
[2]Liu,C.;Yan,X.;Yang,X.*,Submitted
[3]Li,H.;Yang,X.*;Wang,X.;Liu,M.;Ye,F.;Zhang,Y.Nano Energy 2015,12:468
[2]Liu,C.;Yan,X.;Yang,X.*,Submitted
[3]Li,H.;Yang,X.*;Wang,X.;Liu,M.;Ye,F.;Zhang,Y.Nano Energy 2015,12:468