Report by Xiong Wen (David) LOU from Nanyang Technological University

Time : 
Sat, 12/24/2011 - 10:00
Location : 
J220

Subject: Synthesis of Nanostructured Metal Oxide Materials and Their Application in Li-ion Batteries


CV of Dr. David Lou X.W.  (楼雄文)

School of Chemical and Biomedical Engineering

Nanyang Technological University

http://www3.ntu.edu.sg/home/xwlou/


Dr. David Lou’s research is focused on design and synthesis of novel nanostructured materials, for example, hollow structures, for applications in energy conversion and storage devices, such as lithium-ion batteries, supercapacitors and electrocatalysis. 

 

He received his B.Eng. (1st class honors) (2002) and M.Eng. (2004) from the National University of Singapore. He obtained his Ph.D. in chemical engineering from Cornell University in 2008. For his excellent PhD thesis work, he was awarded the Austin Hooey Prize and the Liu Memorial Award. Right after graduation, he joined Nanyang Technological University as an Assistant Professor. As a leading author, he has published over 80 papers in good journals, including one invited review article in Advanced Materials on the subject of hollow micro-/nano-structures. His papers have been cited over 2250 times according to ISI web of science with an H-index of 21. He also holds several patents in nanostructured electrode materials for high-performance lithium-ion batteries.  


Abstract


 Lithium-ion batteries (LIBs) power millions of laptop computers and other portable electronics. Despite great commercial success, the performance of LIBs based on current electrode materials is approaching its limit. High-energy density and high-power LIBs with greater safety are also vitally important for widespread use of electric cars, which have regained interest recently in view of fast depletion of fossil fuels and associated environmental concerns and climate change. Therefore, there is an urgent need to develop new high-performance electrode materials with significantly higher capacities and/or power densities for next-generation LIBs.

 Several metal oxides are suggested as promising high-capacity negative electrode materials. However, it is generally observed that the metal oxide based high-capacity negative electrode materials suffer from rapid capacity fading during charging-discharging cycles. We have employed hydrothermal/solvothermal methods to synthesize a wide range of new metal oxide based nanomaterials, and investigated their potential application as anode materials for high-performance lithium-ion batteries.

 In this talk, I will briefly discuss three types of metal oxides based on three different lithium storage mechanisms. (i) Specifically, we have synthesized hollow SnO2 nanostructures by both templating and template-free methods, and further engineered them into SnO2-carbon composite hollow structures to achieve significantly improved lithium storage properties.  (ii) We also try to improve the lithium insertion properties of TiO2 by engineering the crystal facets in view of the fact that lithium insertion in TiO2 is anisotropic. In particular, anatase TiO2 in the form of nanosheet with exposed (001) facets is an ideal host structure for this purpose. We verified this hypothesis by both experimental measurement and theoretical calculation. (iii) We have also demonstrated the concept for conversion reaction compounds (e.g., Fe2O3) showing that the cycling performance can be improved by creating a porous/hollow structure. Lastly, I will briefly talk about some of our recent works about metal oxide-carbon (graphene and CNTs) hybrid materials.    

 

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