Journal
ELECTROCHIMICA ACTA
Volume 224, Issue -, Pages 80-89Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.12.031
Keywords
Coordination polymers; nanocomposites; nickel-cobalt oxides; graphitized carbon; electrochemical energy storage
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Funding
- National Nature Science Foundation of China [21271076, 21471060, 21571066]
- Key Program of Guangdong Universities Science and Technology innovation [cxzd1020]
- Planning Program of Guangzhou City Science and Technology [2013J4100049]
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A simple and effective method is developed to synthesize bimetal oxide@graphitized carbon nanocomposites composed of graphitized carbons, Ni-Co oxides, and a small amount of Ni and Co metals (denoted as NCxO@G, where x represents Ni/Co mole ratio), by in-situ thermal decomposition of their corresponding coordination polymers. The resultant NCxO@G nanocomposites exhibit excellent electrochemical performance such as high specific capacity and good cycling stability. Experimental results demonstrate that the Ni/Co mole ratio plays an important role in determining the electrochemical behaviors, and a small amount of Ni and Co metals can boost the performance. A maximum specific capacity of ca. 673.5C g(-1) at current density of 1.2 A g(-1), a superior capacity retention (similar to 105% after 10,000 cycles at 10 mV s(-1)), and a remarkable energy density of 46 Wh kg(-1) with a high power density of 300 W kg(-1) can be achieved when the Ni/Co ratio equals to ca. 1.0, signifying that this kind of nanocomposites are potential candidates for electrochemical energy storage. (C) 2016 Elsevier Ltd. All rights reserved.
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