Reed Wittman

Materials Scientist

Author profile picture

Materials Scientist

rwittm@sandia.gov

(505) 681-4639

Biography

Reed earned his BSE in Material Science Engineering at Arizona State University in 2013. He then went on to complete a PhD in Energy Science and Engineering through the Bredesen Center, an interdisciplinary degree program centered on all aspects of energy, at the University Tennessee and Oak Ridge National Lab. His PhD dissertation focused on using materials and electrochemical methods to understand the fundamental processes at the Zinc (Zn) electrode of alkaline Zn batteries. After joining Sandia National Lab in 2019, he shifted focus to understanding fundamental aspects of safety and reliability of Lithium (Li)-ion and aqueous batteries. His current work includes materials and electrochemical characterization of Li-ion battery degradation mechanisms during long-term cycling, and fundamental origins of gas evolution in aqueous flow batteries.

Research Interests

  • Degradation mechanisms of Li-ion batteries
  • Gas evolution in aqueous batteries
  • Battery Safety and Reliability

Education

  • Ph.D. in Energy Science and Engineering, University of Tennessee (Knoxville, TN), 2019
  • B.SE. in Materials Science and Engineering, Arizona State University (Tempe, AZ), 2013

Google Scholar

Reed Wittman

Publications

  • Preger, Y., Feinauer, M., Torres-Castro, L., Hogrefe, C., Gray, L., Gerosa, G., Langendorf, J., Hafele, S., Wittman, R.M., Worz, M., Rich, C., Bose, O., Holzle, M., Johnson, N.B., Wohlfahrt-Mehrens, M., & Waldmann, T. (2025). Impact of Testing Method on Safety Assessment of Aged Li-Ion Cells: Part II – Aged Cells Without Li Plating. Journal of the Electrochemical Society, 172(8). https://doi.org/10.1149/1945-7111/adeed0 Publication ID: 157464
  • Lambert, T.N., Wittman, R.M., & Koripella, C.R. (2024). Zn and Zn/Fe Air and V-, Fe- and Zn-Flow Batteries [Conference Presentation]. https://doi.org/10.2172/2997348 Publication ID: 161004
  • Upadhya, S., Wittman, R.M., Rich, C., Fresquez, A.J., Chalamala, B., Wagner, M., Mahvi, A., & Preger, Y. (2024). Long-Term Cycling and Analysis of 18650 Li-ion Cells Beyond 80% Capacity [Conference Presentation]. https://doi.org/10.2172/2585957 Publication ID: 158528
  • Wittman, R.M., Bays, N.R., Bays, N.R., Anderson, T.M., & Preger, Y. (2023). Quantifying Chlorine Gas Evolution from Mixed-Acid Vanadium Redox Flow Batteries: A Case Study on Aqueous Battery Safety [Conference Presentation]. https://doi.org/10.2172/2430372 Publication ID: 125296
  • Wittman, R.M., Fresquez, A.J., Rich, C., Chalamala, B., & Preger, Y. (2023). Degradation of Li-ion Cells Beyond 80% Initial Capacity [Conference Presentation]. https://doi.org/10.2172/2430790 Publication ID: 126696
  • Wittman, R.M., Bays, N.R., Bays, N.R., Anderson, T.M., & Preger, Y. (2023). Quantification of Chlorine Gas Generation in Mixed-Acid Vanadium Redox Flow Batteries. ACS Applied Energy Materials, 6(6), pp. 3167-3172. https://doi.org/10.1021/acsaem.2c03152 Publication ID: 106768
  • Wittman, R.M., Bays, N.R., Bays, N.R., Anderson, T.M., & Preger, Y. (2022). Quantifying Chlorine Gas Evolution from Mixed-Acid Vanadium Redox Flow Batteries [Conference Presentation]. https://doi.org/10.2172/2006136 Publication ID: 121264
  • Wittman, R.M., Fresquez, A.J., Chalamala, B., & Preger, Y. (2022). Update on systematic cycle aging of NMC and NCA 18650 Li-ion batteries [Conference Presentation]. https://doi.org/10.2172/2005366 Publication ID: 118912
  • Wittman, R.M. (2022). Quantifying Chlorine Gas Evolution from Mixed-Acid Vanadium Redox Flow Batteries [Conference Presentation]. https://doi.org/10.2172/2004847 Publication ID: 118212
  • Wittman, R.M., Fresquez, A.J., Chalamala, B., & Preger, Y. (2022). Long Term Cycling of 18650 Li-ion Cells Beyond 80% Capacity [Conference Poster]. https://doi.org/10.2172/2004841 Publication ID: 118188
  • Wittman, R.M. (2022). A Brief Overview of Flow Battery Construction and Operational Considerations [Conference Presentation]. https://doi.org/10.2172/2003572 Publication ID: 113604
  • Wittman, R.M., Preger, Y., Fresquez, A.J., & Chalamala, B. (2022). Systematic Cycle and Calendar Aging of Commercial 18650 LFP Lithium-Ion Cells [Conference Presentation]. https://doi.org/10.2172/2003268 Publication ID: 112452
  • Wittman, R.M. (2022). Path Dependence of Li-Ion Battery Degradation During Cycling to 80% Capacity [Conference Presentation]. https://doi.org/10.2172/2003160 Publication ID: 112044
  • Chalamala, B., Preger, Y., Wittman, R.M., & Bates, A.M. (2022). Advances in Energy Storage Technologies [Conference Presentation]. https://doi.org/10.2172/2001732 Publication ID: 108016
  • Wittman, R.M., Bays, N.R., Anderson, T.M., & Preger, Y. (2021). Gas Evolution from Mixed-AcidFlow Batteries [Conference Poster]. https://doi.org/10.2172/1893282 Publication ID: 76304
  • Wittman, R.M., Fresquez, A.J., Chalamala, B., & Preger, Y. (2021). Cycling of Li-ion Batteries Beyond 80% Capacity [Conference Poster]. https://doi.org/10.2172/1893288 Publication ID: 76303
  • Wittman, R.M., Fresquez, A.J., Chalamala, B., & Preger, Y. (2021). Systematic Long-Term Cycling of 18650 Batteries Beyond 80% Capacity [Conference Presentation]. https://doi.org/10.2172/1890855 Publication ID: 76042
  • Wittman, R.M. (2021). Side by Side Comparison of Redox Flow and Li-ion Batteries [Conference Presentation]. https://doi.org/10.2172/1876722 Publication ID: 78968
  • Wittman, R.M. (2021). Comprehensive Electrochemical and Materials Characterization of Commercial Li-ion Battery Degradation [Conference Presentation]. https://doi.org/10.2172/1870274 Publication ID: 78600
  • Wittman, R.M. (2021). Gas Evolution from Mixed-Acid Vanadium Redox Flow Battery [Conference Presentation]. https://doi.org/10.2172/1870092 Publication ID: 78581
  • Wittman, R.M. (2021). Overview of Aqueous Battery Safety and Reliability Concerns [Conference Presentation]. https://doi.org/10.2172/1882055 Publication ID: 78179
  • Wittman, R.M., Preger, Y., Fresquez, A.J., Taggart, G.S., & Chalamala, B. (2020). Materials Degradation Trends from Systematic Long-Term Cycling of Commercial Li-Ion Batteries [Conference Presentation]. https://doi.org/10.2172/1831590 Publication ID: 71576
  • Preger, Y., Wittman, R.M., Fresquez, A.J., Torres-Castro, L., & Lamb, J. (2020). Long-term Performance and Safety of Commercial Li-ion Cells [Conference Poster]. https://www.osti.gov/biblio/1821102 Publication ID: 74885
  • Wittman, R.M., Fresquez, A.J., Taggart, G.S., Chalamala, B., & Preger, Y. (2020). Electrochemical and Materials Characterization of Li-ion Cells during Long Term Cycling [Conference Poster]. https://www.osti.gov/biblio/1821100 Publication ID: 74883
  • Wittman, R.M., Perry, M.L., Lambert, T.N., Chalamala, B., & Preger, Y. (2020). Perspective—On the Need for Reliability and Safety Studies of Grid-Scale Aqueous Batteries. Journal of the Electrochemical Society (Online), 167(9). https://doi.org/10.1149/1945-7111/ab9406 Publication ID: 73554
Showing 10 of 25 publications.