• 文献标题:   Reduced Graphene Oxide Films with Ultrahigh Conductivity as Li-Ion Battery Current Collectors
  • 文献类型:   Article
  • 作  者:   CHEN YN, FU K, ZHU SZ, LUO W, WANG YB, LI YJ, HITZ E, YAO YG, DAI JQ, WAN JY, DANNER VA, LI T, HU LB
  • 作者关键词:   high conductivity, hightemperature reduction, reduced graphene oxide, current collector, lightweight, liion batterie
  • 出版物名称:   NANO LETTERS
  • ISSN:   1530-6984 EI 1530-6992
  • 通讯作者地址:   Univ Maryland
  • 被引频次:   70
  • DOI:   10.1021/acs.nanolett.6b00743
  • 出版年:   2016

▎ 摘  要

Solution processed, highly conductive films are extremely attractive for a range of electronic devices, especially for printed macroelectronics. For example, replacing heavy, metal-based current collectors with thin, light, flexible, and highly conductive films will further improve the energy density of such devices. Films with two-dimensional building blocks, such as graphene or reduced graphene oxide (RGO) nanosheets, are particularly promising due to their low percolation threshold with a high aspect ratio, excellent flexibility, and low cost. However, the electrical conductivity of these films is low, typically less than 1000 S/cm. In this work, we for the first time report a RGO film with an electrical conductivity of up to 3112 S/cm. We achieve high conductivity in RGO films through an electrical current-induced annealing process at high temperature of up to 2750 K in less than 1 min of anneal time. We studied in detail the unique Joule heating process at ultrahigh temperature. Through a combination of experimental and computational studies, we investigated the fundamental mechanism behind the formation of a highly conductive three-dimensional structure composed of well-connected RGO layers. The highly conductive RGO film with high direct current conductivity, low thickness (similar to 4 mu m) and low sheet resistance (0.8 Omega/sq.) was used as a lightweight current collector in Li-ion batteries.