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    报告题目：High-Energy Cathode Materials for Next-Generation Lithium-Ion Batteries

    时  间：2013年1月3日（星期五）上午10:00点 

    地  点：5#-402      

 

High-Energy Cathode Materials for Next-Generation Lithium-Ion Batteries

 

Curriculum Vitae:

Haijun Yu obtained his Doctor degree at Northeastern University in China in August 2007.  He joined the Beijing General Research Institute of Non-ferrous Metals as an Engineer, senior-Engineer in September 2007 and December 2009.  Then he was selected as the master adviser in January 2010.  In October 2010, he moved to Prof. Haoshen Zhou’s group at National Advanced Institute Science and Technology as a postoctoral fellow in Japan.  Until now, he has published over 50 papers and 15 patents application (including 4 granted).  Some of his papers have been published in Angew. Chem. Int. Ed., Energy Environ. Sci., J. Phy. Chem. Lett.,  Chem. Commun. J. Mater. Chem., etc.  His current research interests focus on the electrode materials investigation of lithium/sodium/magnesium-ions batteries and other energy-conversation devices, including inorganic and metallic materials synthesis, large-scale industrial techniques exploration, average/local crystallographic structure and reaction mechanism researches by the methods of Rietveld structure refinement, synchrotron X-ray diffraction (SXRD), Neutron diffraction, pair distribution function (PDF) and novel microscopy electron diffraction techniques (HAADF/ABF-STEM, EELS) etc..

Abstract:

Lithium-manganese-rich layered oxides materials (Li₂MnO₃-LiTMO₂, TM=Mn, Ni and Co) are the most attractive candidates utilized as cathode in lithium ion batteries because of their higher discharge capacity (~ 280 mAh/g) and energy density (~ 1000 Wh/kg), which are almost twice larger than those of conventional lithium-ion cathode materials such as LiCoO₂ and LiMn₂O₄, and have attracted most attention from both academic and industrial communities.  Despite much progress made in recent years, there are still many scientific challenges of lithium-manganese-rich layered oxides materials.  The structure and reaction mechanism are ambiguous, and numerous scientific challenges (low initial Coulombic efficiency, poor rate capability, and voltage degradation during cycling) of these materials that must be overcome to realize their utilization in commercial lithium-ion batteries.  The challenges and prospects associated with the current researching results of these lithium-rich layered cathode materials of lithium-ion batteries will be discussed.