Journal
ELECTROCHIMICA ACTA
Volume 143, Issue -, Pages 175-179Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.08.023
Keywords
Co3O4; Quantum dot; Graphene; Microwave irradiation; Anode material
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Funding
- Program for New Century Excellent Talents in University of Ministry of Education of China [NCET-11-1081]
- National Natural Science Foundation of China [21203168]
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Co3O4 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 Co3O4 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 Co3O4 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 Co3O4 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. (C) 2014 Elsevier Ltd. All rights reserved.
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