Journal
APPLIED SURFACE SCIENCE
Volume 440, Issue -, Pages 748-754Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2018.01.201
Keywords
Lithium-ion battery; LiFePO4; Graphene; Conductive agent; High rate
Categories
Funding
- National Key Research and Development Program of China [2017YFB0102204]
- Science and Technology Program of State Grid Corporation of China [DG71-16-024]
- Special Funds for Enterprise Innovation and Transformation of Achievements of Jiangsu Province [BA2015171]
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In this work, the electrochemical properties of the LiFePO4 cathode using graphene as a conductive agent were revealed. Compared to the conventional LiFePO4 electrodes with carbon black as a conductive agent, the graphene sheets can establish a more effective conductive framework due to their layered structure and excellent electronic conductivity, leading to better electrochemical rate performance. Furthermore, the obverse of increasing graphene content is continued gains in high-rate performance of the LiFePO4 electrodes. The electrodes with 30 wt% graphene show high capacities up to 103.1 mA h g(-1) and 68 m A h g(-1) during discharging with extremely high rates of 30 C and 50 C, respectively. Besides, good cycling performance at high rate is also achieved. The electrodes with 30 wt% graphene display a capacity retention higher than 80% after 1000 cycles at 30 C. These results not only indicate that the graphene could be a promising candidate as a conductive agent, but also provide a new insight for designing LiFePO4 electrodes with brilliant high-rate performance via a simple method. (C) 2018 Elsevier B.V. All rights reserved.
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