期刊
ELECTROCHIMICA ACTA
卷 184, 期 -, 页码 364-370出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.10.087
关键词
Lithium ion batteries; Slightly exfoliated graphite; Si nanoparticles; Amorphous carbon; Volumetric capacity
资金
- National Key Basic Research Program of China [2014CB932400]
- NSAF [U1330123]
- National Natural Science Foundation of China [51232005, U1401243]
- Shenzhen Basic Research Project [ZDSYS20140509172959981, JCYJ20140417115840246]
- Guangdong Province Innovation R&D Team Plan for Energy and Environmental Materials [2009010025]
- Production-study-research cooperation project of guangdong province [2014B090901021]
To boost the commercialization of high energy density lithium ion batteries (LIBs) used for electric vehicles, the development of electrode materials with high volumetric capacity is of great significance. In this work, a novel Si/slightly exfoliated graphite (SEG)/carbon composite used as anode for LIBs with high volumetric capacity is fabricated. The Si nanoparticles are uniformly intercalated in the squashed interlayers of SEG which are then further filled by amorphous carbon. The SEG acts as a conductivity skeleton, while the spaces between squashed interlayers(folds) in SEG function as buffer spaces for the expansion of Si nanoparticles during lithiation reactions. The amorphous carbon connects the Si nanoparticles with SEG to form a 3D conductive network. Owing to the high packing density (0.7 g cm(-3)) and unique structure, this material possesses a high volumetric capacity of 1050 mAh cm(-3). Meanwhile, the Si/SEG/C composite also exhibits excellent rate and cyclic performance, presenting a reversible capacities of 1456 and 1056 mAh g(-1) at 100 and 500 mA g(-1) with capacity retention of 84.7% after 50 cycles at 500 mA g(-1). This work opens up an avenue to craft the Si/C composite with high volumetric energy densities and rate performance. (C) 2015 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据