材料工程2018，Vol.46Issue(4)：43-50,8.DOI:10.11868/j.issn.1001-4381.2017.000826
磷酸铁锂/石墨烯复合材料的合成及电化学性能
Synthesis and Performance of LiFeP04-C/Graphene Composite
南文争 1燕绍九 1彭思侃 1张晓艳 1刘大博 1戴圣龙1
作者信息
- 1. 中国航发北京航空材料研究院 石墨烯及应用研究中心, 北京 100095
- 折叠
摘要
Abstract
LiFePO4-C/graphene composite was successfully prepared by a facile approach of grinding, ultrasonic dispersion, stirring and drying and used as the cathode material for lithium-ion batteries. The structure and morpholgy of as-prepared LiFePO4-C/graphene composite material was characterized with transmission electron microscopy, scanning electron microscopy, X-ray diffraction and Raman spectroscopy, and the electrochemical performance was tested using coin cells assembled in an argon-filled glovebox. SEM images show that in the as-prepared material, graphene nanoflakes are adhered on the surface of LiFeP04-C particles, and uniformly dispersed in the composite material forming an effective 3D conducting network. Electrochemical tests show that after adding 2％ of graphene, rate and cycling performances of the LiFeP04 -C/graphene composite material are obviously improved. For the rate performance, a high reversible capacity of 94. 2mAh · g-1 is achieved at 5C rate, which is more than 2. 53 times higher than that of pristine LiFeP04-C; For cycling performance, the composite material shows a low capacity decay rate of 9. 6％ when cycles under 1C rate for 100 times, which is lower than pure LiFeP04-C (43. 5％). The electrochemical performance enhancement can be mainly ascribed to the effective 3D conducting network formed by graphene nanoflakes with superior conductivity.关键词
磷酸铁锂/石墨烯复合材料/电化学性能/倍率性能/循环性能Key words
LiFePO4-C/graphene composite/electrochemical performance/rate performance/cycling performance分类
通用工业技术引用本文复制引用
南文争,燕绍九,彭思侃,张晓艳,刘大博,戴圣龙..磷酸铁锂/石墨烯复合材料的合成及电化学性能[J].材料工程,2018,46(4):43-50,8.
