Education
Ph.D. in Metallurgical Engineering, University of Utah, Salt Lake City, USA, 2005 - 2010
Dissertation: Synthesis & Characterization of Light Metal Based Hydrides for H2 Storage Materials
Advisor: Prof. Hong Yong Sohn and Prof. Zak Fang
M.S. in Materials Science & Engineering, Seoul National University, Seoul, Korea, 2004 - 2006
Dissertation: Study on the solderability of Sn-Al Lead-free solder by electrodeposition
Advisor: Prof. Hun-Joon Sohn
B.S. in Materials Science & Engineering, Hanyang University, Seoul, Korea, 1997 - 2004
Research Experience
Pacific Northwest National Laboratory, Postdoctoral Researcher, 2010 - Present
* Development of electrode materials/components for Li-ion battery & high capacity reversible metal hydride-air battery
-Synthesis, electrochemical evaluation and thermal stability of poly-anion type cathodes (LiMPO4 and Li2MSiO4, M = Fe, Mn)
-Designed functionalized polymer coated anode materials and constructed prototype of metal hydride-air battery system
* Demonstration of novel chemical hydrides for H2 storage system
-Produced and characterized novel H2 storage materials of NH3BH3-MH (M = MgH2, TiH2, CaH2, ZrH2), NH3BH3-BH (B = Ca(BH4)2, Mg(BH4)2), NH3BH3-MC (MC = Methyl cellulose) and fluid phases NH3BH3
University of Utah, Graduate Research Assistant, 2005 - 2010
* Discovery of nano-crystalline complex metal hydrides for reversible H2 storage
-Initiated novel H2 storage materials of Mg-Ti-H ternary system, Ti-catalyzed Li-Al-B-H complex system, a new binary nitride (LiMgN), Mg-/Li-based non-equilibrium systems
-Synthesized and characterized Ti-doped Al/Mg nano-powders, Mg2Si/TiFe/MgB2/AlB2 intermetallic compounds and Mg contained nano-porous carbon aerogels for H2 storage materials
* Design of nano-structured inorganic materials for energy storage via novel Chemical Vapor Synthesis (CVS) process
-Constructed various types of CVS, and synthesized alloys, Si-/Sn-based oxides and Mg-/Si-based carbonaceous electrode materials for Li-ion batteries
-Fabricated metal, ceramic nano-powders (W, W/Co, W/Cu) for refractory application, and investigated their sintering behavior
Seoul National University, Graduate Research Assistant, 2004 - 2006
* Exploration of electrode materials for Li-ion secondary batteries, lead-free solder and resource recycling
-Synthesized and investigated Mg-C nano-composite for Li-ion anode materials
-Invented Sn-Al soldering materials and characterized their electrochemical, physical and wetting properties
-Designed and constructed electro-winning process for precious metals (Pd, Pt) from waste water and characterized their electrochemical properties
Hanyang University, Undergraduate Research Assistant, 2003
* Investigation of nano-composite powder for electrode materials
-Prepared W/Cu nano-composite powder by mechano-chemical process/H2 reduction and characterized microstructure and sintering behavior
Skills
* Synthesis of nano-scaled metal/ceramic/intermetallic powders using mechano-/electro- chemical and vapor-phase reduction methods
* Materials characterization using XRD, SEM/TEM, XPS, TG/DSC/MS, FT-IR/Raman, ICP-AES, NMR, BET, thermal diffusivity, viscometer, electrochemical techniques, etc.
Research Records
Peer Reviewed Publications
1. A. Aijaz, A. Karkamkar, Y.J. Choi, N. Tsumori, E. Rönnebro, T. Autrey, H. Shioyama, Q. Xu, “Immobilizing Highly Catalytically Active Pt Nanoparticles inside the Pores of Metal-Organic Framework: A Double Solvents Approach.” (Manuscript ID: ja-2012-043905, submitted to Journal of the American Ceramic Society, May 7 2012)
2. Y.J. Choi, Y. Xu, W. Shaw, E. Rönnebro, “Hydrogen Storage Properties of New Hydrogen-Rich NH3BH3-Metal Hydride (TiH2, ZrH2, MgH2, and/or CaH2) Composite Systems,” Journal of Physical Chemistry C 116 (2012) 8349-8358.
3. D. Neiner, A. Karkamkar, M. Bowden, Y.J. Choi, A. Luedtke, J. Holladay, A. Fischer, N. Szymczak, T. Autrey, “Kinetic and Thermodynamic Investigation of Hydrogen Release from Ethane 1,2-di-amineborane,” Energy & Environmental Science 4 (2011) 4187-4193.
4. D. Choi, J. Xiao, Y.J. Choi, J.S. Hardy, M.S. Bhuvaneswari, V. Murugesan, J. Liu, W. Xu, W. Wang, J.-G. Zhang, Z. Yang, G.L. Graff, “Thermal Stability and Phase Transformation of Electrochemically Charged/Discharged LiMnPO4 Cathode for Li-Ion Battery,” Energy & Environmental Science 4 (2011) 4560-4566.
5. Y.J. Choi, J. Lu, H.Y. Sohn, Z.Z. Fang, “Reaction Mechanisms in the Li3AlH6-LiBH4 and Al-LiBH4 Systems for Reversible Hydrogen Storage - Part 1: H-Capacity and Role of Al,” Journal of Physical Chemistry C 115 (2011) 6040-6047.
6. Y.J. Choi, J. Lu, H.Y. Sohn, Z.Z. Fang, C. Kim, R.C. Bowman Jr., S.-J. Hwang, “Reaction Mechanisms in the Li3AlH6-LiBH4 and Al-LiBH4 Systems for Reversible Hydrogen Storage - Part 2: Solid State NMR Studies,” Journal of Physical Chemistry C 115 (2011) 6048-6056.
7. T. Ryu, Y.J. Choi, S. Hwang, H.Y. Sohn, I. Kim, “Synthesis of yttri...
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