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Park C.-M.,Lawrence Berkeley National Laboratory | Kim J.-H.,National Renewable Energy Laboratory | Kim H.,Samsung | Sohn H.-J.,Research Center for Energy Conversion And Storage
Chemical Society Reviews | Year: 2010

Research to develop alternative electrode materials with high energy densities in Li-ion batteries has been actively pursued to satisfy the power demands for electronic devices and hybrid electric vehicles. This critical review focuses on anode materials composed of Group IV and V elements with their composites including Ag and Mg metals as well as transition metal oxides which have been intensively investigated. This critical review is devoted mainly to their electrochemical performances and reaction mechanisms (313 references). © 2010 The Royal Society of Chemistry. Source


Park C.-M.,Research Center for Energy Conversion And Storage | Sohn H.-J.,Research Center for Energy Conversion And Storage
Advanced Materials | Year: 2010

The new concept of quasi-intercalation and the method of facile amorphization are demonstrated for layered orthorhombic ZnSb, orthorhombic-black P and rhombohedral-grey As. These anode materials showed excellent electrochemical properties. Application of this concept and method in layered materials will be a breakthrough for realization and mass production of next generation lithium ion batteries. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA. Source


Park C.-M.,Research Center for Energy Conversion And Storage | Sohn H.-J.,Research Center for Energy Conversion And Storage
Journal of the Electrochemical Society | Year: 2010

Intermetallic TiSb2 and Sb/TiC/C nanocomposites were prepared by alloying and dealloying reactions, respectively, and their potential as anode materials for rechargeable Li-ion batteries was investigated. The Sb/TiC/C nanocomposite was composed of nanocrystalline Sb and TiC, which were distributed uniformly in an amorphous carbon matrix. The reaction mechanism of intermetallic TiSb2 with Li was examined by ex situ X-ray diffraction and high resolution transmission electron microscopy. The Sb/TiC/C nanocomposite exhibited good electrochemical performance, such as a high initial coulombic efficiency of 87% and a long cycle retention of 83% after 100 cycles. © 2009 The Electrochemical Society. Source


Piao Y.,Seoul National University | Piao Y.,Korea Advanced Institute of Science and Technology | Kim H.S.,Research Center for Energy Conversion And Storage | Sung Y.-E.,Research Center for Energy Conversion And Storage | Hyeon T.,Seoul National University
Chemical Communications | Year: 2010

A simple and scalable process was developed for the synthesis of highly crystalline magnetite nanocrystals embedded in a carbon matrix using low cost starting materials; the resulting nanocomposite showed a very high specific capacity of 863 mA hg-1 in the initial cycle and high capacity retention of 90% after 30 cycles. © 2010 The Royal Society of Chemistry. Source


Park C.-M.,Research Center for Energy Conversion And Storage | Sohn H.-J.,Research Center for Energy Conversion And Storage
Electrochimica Acta | Year: 2010

Intermetallic FeSb2 and CrSb2 and their nanocomposites (FeSb2/C and Sb/Cr3C2/C) were prepared using solid-state routes, such as heat-treatment and high-energy mechanical milling, in order to enhance the electrochemical properties of Sb. These electrodes were tested as anode materials for rechargeable Li-ion batteries. The reaction mechanism of intermetallic FeSb2 and CrSb2 was investigated using ex situ X-ray diffraction and high resolution transmission electron microscopy. The FeSb2/C and Sb/Cr3C2/C nanocomposite electrodes exhibited greatly enhanced electrochemical behaviors compared to the FeSb2 and CrSb2 electrodes. Additionally, the Sb/Cr3C2/C nanocomposite electrode showed a better electrochemical performance than the FeSb2/C nanocomposite electrode. © 2010 Elsevier Ltd. All rights reserved. Source

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