Preparation of Three-dimensional Porous Reduced Graphene Oxide Aerogel and Its Application in Lithium-ion Batteries
DENG Xiao-mei1, WEN Hao2, ZHANG Chu-hong2, DENG Jian-guo3, GAO Li-zhen1
1. Environmental Science and Engineering College, Taiyuan University of Technology Science, Taiyuan 030000, China; 2. The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610065, China; 3. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China
摘要以天然鳞片石墨为原料，采用改良的Hummers方法，制备了高纯度的薄层或单层氧化石墨(GO)；并以抗坏血酸为还原剂，通过自组装还原的方式成功制备了具有三维多孔独巨石结构的还原氧化石墨烯(rGO)气凝胶，其形貌和结构经FT-IR, SEM, TEM, XRD和XPS表征。并对其作为锂离子电池负极材料的电化学性能进行了测试。结果表明：rGO气凝胶独特的形貌和结构提高了其比容量和循环性能，在100 mA·g-1电流密度下首周放电比容量可达1 700 mAh·g-1，首周充电比容量达710 mAh·g-1，经过100周循环后放电比容量仍可保持在450 mAh·g-1，库伦效率保持在98%。
Abstract：Reduced graphene oxide(rGO) aerogel with a three-dimensional porous monolithic structure was synthesized via self-assembly using L-ascorbic acid as reductant from graphene oxide, which was prepared by a modified Hummers method using natural graphite as starting material. The morphological and structure were characterized by FT-IR, SEM, TEM, XRD and XPS. The electrochemical performances as lithium ion battery anode were tested. The results showed that the rGO aerogel exhibited high specific capacities and a good cyclability, the initial discharge and charge specific capacities reached 1 700 mAh·g-1 and 710 mAh·g-1, respectively, at a current density of 100 mA·g-1. After 100 cycles the reversible discharge specific capacity could still retain at 450 mAh·g-1 along with the coulombic efficiency at 98%.
2016, Vol. 24 
