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
- 83Citations
- 45Captures
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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.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0013468614016132; http://dx.doi.org/10.1016/j.electacta.2014.08.023; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84907353421&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0013468614016132; https://dx.doi.org/10.1016/j.electacta.2014.08.023
Elsevier BV
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