Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7835437 | Applied Surface Science | 2018 | 7 Pages |
Abstract
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 30â¯wt% graphene show high capacities up to 103.1â¯mAâ¯hâ¯gâ1 and 68â¯mAâ¯hâ¯gâ1 during discharging with extremely high rates of 30â¯C and 50â¯C, respectively. Besides, good cycling performance at high rate is also achieved. The electrodes with 30â¯wt% graphene display a capacity retention higher than 80% after 1000 cycles at 30â¯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.
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Authors
Xufang Wei, Yibiao Guan, Xiaohui Zheng, Qizhen Zhu, Jinran Shen, Ning Qiao, Shuqin Zhou, Bin Xu,