Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7737547 | Journal of Power Sources | 2014 | 6 Pages |
Abstract
Graphene nanosheets are synthesized by a novel facile method involving freeze-drying technology and thermal reduction. The microstructure and morphologies are characterized by X-ray diffraction, Brunauer-Emmett-Teller measurements, Fourier transform infrared spectroscopy, and high resolution transmission electron microscope. The results indicate that graphene nanosheets with high specific surface area (358.3 m2 gâ1) and increased interlayer distance (0.385 nm) are successfully obtained through the freeze-drying process. The electrochemical performances are evaluated by using coin-type cells versus lithium. A high initial reversible capacity of 1132.9 mAh gâ1 is obtained at a current density of 100 mA gâ1. More importantly, even after 300 cycles at a high current density of 1000 mA gâ1, a stable specific capacity of 556.9 mAh gâ1 can be achieved, suggesting the graphene nanosheets exhibit superior cycle stability. The fascinating electrochemical performance could be ascribed to the high specific surface area and the increased layer distance between the graphene nanosheets.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Dandan Cai, Suqing Wang, Liangxin Ding, Peichao Lian, Shanqing Zhang, Feng Peng, Haihui Wang,