期刊
CARBON
卷 139, 期 -, 页码 648-655出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2018.07.017
关键词
Ultrathin-graphite; Polyaniline foam; Flexible graphite carbon; Solid-state pyrolysis; Ultralight weight material
资金
- National Nature Science Foundation of China [51333008]
- Scientific and Technological Program of Guangdong [2017A090905001]
- Young Teacher Training Program of Sun Yat-sen University [17lgpy86]
Three-dimensional carbon-based foam (3D-CF) possesses many fascinating properties such as giant conductivity, high thermal insulation, outstanding mechanical performance, and excellent chemical and thermal stabilities. However, most 3D-CFs acquired by the previously reported fabrication methods have some limitations, such as uncontrollable morphology, plenty of inherent defects, difficult to realize self-standing after removing sacrificial template, and overlapping joint flaws among graphene layers. Although significant research efforts have been devoted to develop 3D foam, it is still a challenging task to obtain 3D-CF with both high conductivity and outstanding mechanical performance, simultaneously. To address this issue, a novel and easy fabricating approach for 3D ultrathin-graphite carbon foam (3D-UGF) was explored by a morphology-retaining pyrolysis of polyaniline foam precursors. The typical 3D-UGF graphitized at 2800 degrees C exhibited stronger compressive strength and electrical conductivity under the compressive strain of 90%, and remained constant even after 2000 cycles, which are comparable to the previously reported state-of-the-art 3D-CF foam with the same density. Cycling performance of the lithium-sulfur and lithium-air batteries with the 3D-UGF as binder-free cathode is as high as 1590 mAh g(-1) and 920 mAh g(-1) after deep discharge/charge 100 cycles, respectively. (C) 2018 Elsevier Ltd. All rights reserved.
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