• 文献标题:   Hybrid lithium-ion capacitors with asymmetric graphene electrodes
  • 文献类型:   Article
  • 作  者:   SUN YG, TANG J, QIN FX, YUAN JS, ZHANG K, LI J, ZHU DM, QIN LC
  • 作者关键词:  
  • 出版物名称:   JOURNAL OF MATERIALS CHEMISTRY A
  • ISSN:   2050-7488 EI 2050-7496
  • 通讯作者地址:   Natl Inst Mat Sci
  • 被引频次:   22
  • DOI:   10.1039/c7ta01113j
  • 出版年:   2017

▎ 摘  要

The dramatically increased demand for electric devices such as electric vehicles and consumer electronics prompted us to explore new ideas in fabricating novel energy storage devices. In this work, we designed, constructed, and studied an asymmetric hybrid lithium-ion capacitor (LIC) by combining an electric double-layer capacitor cathode and a lithium-ion battery anode. Both electrodes were made of a singlewall carbon nanotube and graphene (SG) composite to reduce restacking of the graphene nanosheets, to improve the energy storage capacity, and to improve the electrical conductivity of the electrodes. One of the electrodes was pre-lithiated electrochemically. After pre-lithiation, the lithiated-SG (Li-SG) electrode showed excellent capacity in lithium intercalation and de-intercalation and was used as the anode of the LIC device. The advantage of the hybrid LIC with asymmetric graphene electrodes is that it maximizes the operable voltage between the two electrodes, thus increasing the energy density of the device. The hybrid LIC fabricated in this work exhibited an energy density of 222 W h kg(-1) at a power density of 410 W kg(-1).