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Microwave irradiation synthesis of Co 3 O 4 quantum dots/graphene composite as anode materials for Li-ion battery

Electrochimica Acta, ISSN: 0013-4686, Vol: 143, Page: 175-179
2014
  • 83
    Citations
  • 0
    Usage
  • 45
    Captures
  • 0
    Mentions
  • 6
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    83
    • Citation Indexes
      83
  • Captures
    45
  • Social Media
    6
    • Shares, Likes & Comments
      6
      • Facebook
        6

Article Description

Co 3 O 4 quantum dots/graphene composites were synthesized by a facile and efficient microwave irradiation method, and they were analyzed using XRD, TEM, HRTEM, and TG. Uniform Co 3 O 4 nanocrystals of about 3-8 nm with a high density are homogeneously dispersed on graphene nanosheets. When used as anode materials for Li-ion batteries, the Co 3 O 4 quantum dots/graphene composites show a significantly enhanced cycling performance (1785 mAh g −1 at 0.1 C after 90 cycles) as well as high rate capability (485 mAh g −1 at 5 C). The reversible capacity is found to be much higher than the theoretical value. The superior performance could be attributed to the interfacial lithium-storage and the quantum and size effects of quantum dots that lead to high activity during the lithiation/delithiation process. In addition, the flexible and conductive graphene nanosheets and well dispersed Co 3 O 4 nanodots as well as the synergetic effect between them also benefit the electrochemical performance by endowing a superior high surface area and shortening the diffusion pathway of lithium ions.

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