Electrochemical performance of Li[Co0.1Ni0.15Li0.2Mn0.55]O2 modified by carbons as cathode materials |
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Authors: | Jeong-Hun Ju Sung-Woo Cho Seung-Gi Hwang Su-Ryeon Yun Youngil Lee Han Mo Jeong Moon-Jin Hwang Kwang Man Kim Kwang-Sun Ryu |
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Affiliation: | aDepartment of Chemistry, University of Ulsan, Ulsan 680-749, Republic of Korea;bEnergy Harvest-Storage Research Center, University of Ulsan, Ulsan 680-749, Republic of Korea;cResearch Team of Power Control Devices, Electronics and Telecommunications Research Institute (ETRI), Daejon 305-700, Republic of Korea |
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Abstract: | To enhance specific capacity, cycle performance and rate-capability of lithium-ion battery cathode materials, the Li[Co0.1Ni0.15Li0.2Mn0.55]O2 (LCMNO) is modified by coating them with amorphous carbons and by preparing nanocomposites with nanostructured carbons (carbon nanotube and graphene). The carbon-treated LCMNO powders and their cathodes are characterized by morphological observation, crystalline property analysis, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. The LCMNO nanocomposite shows a superior discharge capacity of ca. 290 mAh g−1 at low C-rates, due to a greater number of active sites embedded by nanostructured carbon species. In contrast, the carbon-coated LCMNO shows higher discharge capacity in high rate regions due to the carbon-coated layer in the carbon-coated LCMNO, suppressing the side reactions and enhancing the electrical conductivity. |
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Keywords: | Carbon coating Nanocomposite Cathode material Lithium-ion battery |
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