Derek Wong
Derek N. Wong, Ph.D.
Associate
Polymer Science & Materials Chemistry
Menlo Park

Trained as a materials science engineer with a focus in electrochemistry, Dr. Wong provides expertise in the failure analysis of electrochemical energy storage devices, particularly lithium-ion batteries of various chemistries. Dr. Wong leverages his diverse background from mechanical and materials science engineering disciplines to consult on the design of safety solutions for transportation and storage of cells, batteries and battery modules. He has experience investigating challenges related to lithium-ion battery degradation, hardware performance, and safety in high power platforms. He specializes in determining the effect of unique power demands on a cell’s electrochemical performance and electrode integrity.

Dr. Wong is experienced in a variety of destructive and non-destructive analysis techniques, including half-cell analysis by electrochemical impedance spectroscopy (EIS), surface chemistry characterization by X-ray photoelectron spectroscopy (XPS), thermal abuse testing, and computed tomography X-ray (CT) analysis to evaluate cell performance and investigate failure mechanisms. The scope of his work ranges from determining battery electrode degradation through EIS data modeling and X-ray photoelectron spectroscopy (XPS) techniques, to development and execution of abuse testing of battery packs and electrical hardware. Dr. Wong also has extensive experience testing phase change components and liquid-cooled enclosures as thermal management solutions for large-format packs. He additionally has provided expertise in issues regarding the interface of batteries and power electronics hardware to source continuous and pulsed loads for military applications.

Prior to joining Exponent, Dr. Wong’s graduate research supported the development of energy storage systems for high power pulsed loads on future all-electric Naval warships. He designed a novel method for collecting in situ three-electrode measurements on commercial-grade lithium-ion cells. Along with evidence gathered from XPS on the composition of surface films of pulsed discharged electrodes, Dr. Wong worked with the Navy to identify degradation mechanisms unique to high rate pulsed discharge operation of lithium iron phosphate cells (LFP). In collaboration with manufacturers and the Naval Surface Warfare Centers, he helped develop a new electrolyte formulation that increased the lifetime of service cells by 200% under the same loading profile.

CREDENTIALS & PROFESSIONAL HONORS

  • Ph.D., Materials Science and Engineering, University of Texas, Arlington, 2016
  • B.S., Mechanical Engineering, University of Texas, Austin, 2012
  • ASM International North Texas Chapter Research Symposium Best Presenter Award, 2014

LANGUAGES

  • Cantonese

Publications

Wong DN, Wetz DA, Heinzel JM, Mansour AN. Characterizing rapid capacity fade and impedance evolution in high rate pulsed discharged lithium iron phosphate cells for complex, high power loads. Journal of Power Sources 2016; 328(1):81-90.

Wong DN, Shrestha B, Wetz DA, Heinzel JM. Impact of high rate discharge on the aging of lithium nickel cobalt aluminum oxide batteries. Journal of Power Sources 2015; 280(1):363-372.

Matasso A, Wong DN, Wetz DA, Liu F. Effects of High-Rate Cycling on the Bulk Internal Pressure Rise and Capacity Degradation of Commercial LiCoO2 Cells. Journal of the Electrochemical Society 2015; 162(6):A885-A891.

Matasso A, Wong DN, Wetz DA, Liu F. Correlation of Bulk Internal Pressure Rise and Capacity Degradation of Commercial LiCoO2 Cells. Journal of the Electrochemical Society 2014; 161(14):A2031-A2035.

Wetz DA, Shrestha B, Donahue ST, Wong DN, Martin MJ, Heinzel JM. Capacity Fade of 26650 Lithium-Ion Phosphate Batteries Considered for Use Within a Pulsed-Power System’s Prime Power Supply. IEEE Transactions on Plasma Science 2015; 43(5):1448-1455.

Ling B, Smuts J, Walsh P, Fan H, Hildenbrand Z, Wong DN, Wetz DA, Schug, KA. Permanent gas analysis using gas chromatography with vacuum ultraviolet detection. Journal of Chromatography A 2015; 1388(1):244-250.

Jiang W, Sundarram S, Wong DN, Koo JH, Li W. Polyetherimide nanocomposite foams as an ablative for thermal protection applications. Composites Part B: Engineering 2014; 58(1):559-565.

Ambuken PV, Stretz HA, Koo JH, Messman JM, Wong DN. Effect of addition of montmorillonite and carbon nanotubes on a thermoplastic polyurethane: High temperature thermomechanical properties. Polymer Degradation and Stability 2014; 102(1):160-169.

Presentations

Wong DN, Matasso A. Correlation of Bulk Internal Pressure Rise and Capacity Degradation of Commercial LiCoO2 Cells. Symposium chosen speaker, ASM International North Texas Chapter Research Symposium, Arlington, TX, 2014.

Matasso A, Wong DN, Wetz DA. Using Internal Pressure Measurements to Fundamentally Understand the Aging of Lithium-Ion Batteries. Poster presentation, 227th Meeting of the Electrochemical Society, Chicago, IL, 2015.

Wong DN, Wetz DA, Mansour AM, Heinzel JM. The influence of high C rate pulsed discharge on lithium-ion battery cell degradation. IEEE Pulsed Power Conference, Austin, TX, 2015.

Prior Experience

Graduate Research Assistant, University of Texas at Arlington, 2013-2016

Naval Research Enterprise Internship Program (NREIP) Researcher, Naval Surface Warfare Center-Carderock Division, 2015

Undergraduate Research Assistant, The University of Texas at Arlington, 2012-2013

Mechanical Engineering Intern, Halliburton Drill Bits and Services, 2011-2012

Professional Affiliations

ASM International, UT Arlington-Vice President, 2014-2015

Society for the Advancement of Material and Process Engineering (SAMPE)

American Society of Mechanical Engineers (ASME)

CREDENTIALS & PROFESSIONAL HONORS

  • Ph.D., Materials Science and Engineering, University of Texas, Arlington, 2016
  • B.S., Mechanical Engineering, University of Texas, Austin, 2012
  • ASM International North Texas Chapter Research Symposium Best Presenter Award, 2014

LANGUAGES

  • Cantonese