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http://dx.doi.org/10.5229/JECST.2016.7.2.139

Electrochemical Performance of Carbon Coated LiMn2O4 Nanoparticles using a New Carbon Source  

Park, Jin Seo (Department of Advanced Materials Engineering, Kyonggi University)
Park, Yong Joon (Department of Advanced Materials Engineering, Kyonggi University)
Publication Information
Journal of Electrochemical Science and Technology / v.7, no.2, 2016 , pp. 139-145 More about this Journal
Abstract
The electrochemical performance of carbon-coated LiMn2O4 nanoparticles was reported. The polydopamine layer was introduced as a new organic carbon source. The carbon layer was homogeneously coated onto the surface of the LiMn2O4 nanoparticles because the polymerization process from the dopamine solution (in a buffer solution, pH 8.5) easily and uniformly formed a polydopamine layer. The phase integrity of LiMn2O4 deteriorated during the carbon-coating process due to oxygen loss, although the main structure was maintained. The carbon-coated sample led to improved rate capability because of the effect of the conductive carbon layer. Moreover, the carbon coating also enhanced the cyclic performance. This indicates that the carbon layer may suppress unwanted side reactions with the electrolytes and compensate for the low electronic conductivity of the pristine LiMn2O4.
Keywords
Carbon coating; LiMn2O4; Cathode; Lithium battery; Polydopamine;
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