期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 509, 期 18, 页码 5662-5666出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.02.113
关键词
Lithium-ion battery; LiFePO4; Cathode active material; Rheological phase method; Polyvinyl butyral (PVB)
资金
- Ministry of Education, Science and Technology, Korea [2010K000328]
LiFePO4/C active material was synthesized using an ultrasonic-assisted rheological phase method. In addition, polyvinyl butyral (PVB) was added in various concentrations to provide carbon coating on the surface of the LiFePO4 particles for enhanced electrical conductivity. The crystal structure, morphology, and carbon coating layer of the synthesized LiFePO4/C was analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), respectively. The electrochemical performance of LiFePO4/C, such as initial capacity, rate capability, cycling performance and EIS, were also evaluated. The synthesized particle had a size range of 100-150nm and a carbon layer of about 8 nm. The LiFePO4/C (5 wt% PVB) delivered an initial discharge capacity of 167.5 mAh/g at a 0.1 C rate. It also showed an excellent capacity retention ratio of 100% after the 50th charging/discharging. EIS results demonstrate that the charge transfer resistance of the sample decreases greatly by coating with 5 wt% PVB. (C) 2011 Elsevier B.V. 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