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[½»Á÷] LiFePO4/graphene¡ª¡ªÅçÎí¸ÉÔïÓë΢²¨·øÉä

·ÖÏíEAһƪÎÄÕ£ºHigh Electrochemical Performance of LiFePO4 Cathode Material via In-Situ Microwave Exfoliated Graphene Oxide
¿ÉÒÔÔÚÏßÏÂÔØ£ºhttp://www.sciencedirect.com/sci ... i/S0013468614021914

Compared with thermally exfoliated graphene oxide (TEGO) prepared at high temperature of 800 C and
a long time of 12 h, microwave exfoliated graphene oxide (MEGO) is successfully synthesized at 800 W for
2 min benefiting from ¡°inert and instant heating¡± of microwave irradiation and employed to optimize
electrochemical performance of LiFePO4. The as-obtained LiFePO4/MEGO exhibits overwhelming
superiorities to LiFePO4/TEGO, particularly in high-rate performance. Although LiFePO4/MEGO delivers
the similar specific capacity of 158.1 mAh g1 as well as the LiFePO4/TEGO at the rate of 0.1 C, the
LiFePO4/MEGO performs smaller polarization of 53.3 mV resulting in better specific energy of 518.1 Wh
 kg1 and energy efficiency of 89.8%. Even at the high rate of 10 C and 20 C, the LiFePO4/
MEGO delivers excellent specific energy of 300.3 Wh kg1 and 229.7 Whkg1 (with corresponding
specific capacity of 104.3 mAhg1 and 87.3 mAhg1 respectively), much better than those of the
LiFePO4/TEGO. After 2000 cycles, the LiFePO4/MEGO still performs excellent rate capabilities with 91.2%
and 83.8% retention respectively.
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  • ¸½¼þ 1 : 1-s2.0-S0013468614021914-main.pdf
  • 2014-11-22 21:18:40, 3.5 M

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