• 文献标题:   A three-dimensional LiFePO4/carbon nanotubes/graphene composite as a cathode material for lithium-ion batteries with superior high-rate performance
  • 文献类型:   Article
  • 作  者:   LEI XL, ZHANG HY, CHEN YM, WANG WG, YE YP, ZHENG CC, DENG P, SHI ZC
  • 作者关键词:   lithium iron phosphate, carbon nanotube, graphene, lithiumion battery, high rate
  • 出版物名称:   JOURNAL OF ALLOYS COMPOUNDS
  • ISSN:   0925-8388 EI 1873-4669
  • 通讯作者地址:   Guangdong Univ Technol
  • 被引频次:   53
  • DOI:   10.1016/j.jallcom.2014.09.169
  • 出版年:   2015

▎ 摘  要

A three-dimensional lithium iron phosphate (LiFePO4)/carbon nanotubes (CNTs)/graphene composite was successfully synthesized via solid-state reaction. The LiFePO4/carbon nanotubes/graphene (LFP-CNT-G) composite used as Li-ions battery cathode material exhibits superior high-rate capability and favorable charge-discharge cycle performance under relative high current density compared with that of LiFePO4/carbon nanotubes (LFP-CNT) composite and LiFePO4/graphene (LFP-G) composite. Graphene nanosheets and CNTs construct 3D conducting networks are favor for faster electron transfer, higher Li-ions diffusion coefficient and lower resistance during the Li-ions reversible reaction. The synergistic effect of graphene nanosheets and CNTs improves the rate capability and cycling stability of LiFePO4-based cathodes. The LFP-CNT-G electrode shows reversible capacity of 168.9 mA h g(-1) at 0.2 degrees C and 115.8 mA h g(-1) at 20 degrees C. The electrochemical impedance spectroscopy demonstrate that the LFP-CNT-G electrode has the smallest charge-transfer resistance, indicating that the fast electron transfer from the electrolyte to the LFP-CNT-G active materials in the Li-ions intercalation/deintercalation reactions owing to the three-dimensional networks of graphene and carbon nanotubes. (C) 2014 Elsevier B.V. All rights reserved.