Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (6): 1271.doi: 10.7503/cjcu2080706

• Physical Chemistry • Previous Articles     Next Articles

Performance of Ru/graphene/carbon Nanotube Composites with Three-dimensional Network Structure as Positive Electrode Catalysts for Lithium Oxygen Batteries

YIN Yanhong, LI Ke, DONG Hongyu, JIN Cheng, XIAO Xinglu, GAO Yicong, YANG Shuting()   

  1. College of Chemistry and Chemical Engineering,National and Local Joint Engineering Laboratory of Motive Power and Key Materials, Power Supply and Key Materials Henan Collaborative Innovation Center, Henan Normal University, Xinxiang 453007, China
  • Received:2018-10-19 Online:2019-06-10 Published:2019-03-27
  • Supported by:
    † Supported by the National Natural Science Foundation of China Youth Science Foundation(No.51502082), the Science and Technology Project of Henan Province, China(No.182102210079) and the Science and Technology Innovation Talents Program of Henan Province, China(No.174100510015).

Abstract:

Ru/graphene/carbon nanotube composites with three-dimensional network structure were prepared by physical impregnation and freeze drying. When the Ru content was 30%(mass fraction) and the heat treatment temperature was 500 ℃, the catalytic performance of the composite was optimal. When the composite was used as a cathode catalyst for lithium oxygen batteries, it exhibited excellent battery performance. When the first charge and discharge were performed at a current density of 50 mA/g, the discharge capacity density was about 5800 mA·h/g, and when the discharge capacity density was within 4000 mA·h/g, the polarization voltage was only was 0.9 V; when a constant-capacitance(500 mA·h/g) charge-discharge cycle was performed at a current density of 50 mA/g, the battery was stable for 12 cycles even when the polarization voltage was lower than 1.1 V. The three-dimensional network structure not only provided a transmission channel for O2 and Li+, but also increased the storage location of the discharge product Li2O2. The loading of the metal ruthenium nanoparticles not only increased the reactive site of the composite, but also promoted the decomposition of the discharge product Li2O2.

Key words: Lithium-oxygen battery, Catalyst, Composite material, Polarization voltage

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