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Sooyeon Hwang

Staff Scientist | Electron Microscopy

Expertise

  • Ex-situ/in-situ transmission electron microscopy characterizations

CFN Research Activities

My research aims describing specific mechanisms of electrochemical reactions and degradation of electrode materials using ex-situ and in-situ transmission electron microscopy. Particular interest includes real-time observation, and structural and chemical characterizations. Fundamental understandings on energy storage materials at the nano scale will provide valuable insights on designing novel materials with excellent performance.

Education

  • B.S.: Ajou University, Republic of Korea
    • Major: Material Science and Engineering
  • M.S.: KAIST (Korea Advance Institute of Science and Technology), Republic of Korea
    • Major: Material Science and Engineering
  • PhD: KAIST (Korea Advance Institute of Science and Technology), Republic of Korea
    • Major: Material Science and Engineering
    • Dissertation Title: Investigating Local Degradation and Thermal Stability of Cathode Materials for Lithium Ion Batteries by Electron Microscopy

Professional Appointments

  • Postdoctoral Research: Korea Institute of Science and Technology (KIST)
    • Center for Energy Convergence
    • Project: A Study on the Reaction and Degradation Mechanism of Electrode Materials for Next-Generation Secondary Batteries using In Situ TEM Analysis Techniques

Selected Publications & Research Highlights

•Sooyeon Hwang, Seung Min Kim, Seong-Min Bak, Kyung Yoon Chung, Wonyoung Chang, Investigating the Reversibility of the Structural Modifications of LixNiyMnzCo1-y-zO2 Cathode Materials during Initial Charge/Discharge, at the Multiple Length Scales, Chemistry of Materials 27, 6044, 2015.

•Sooyeon Hwang, Seung Min Kim, Seong-Min Bak, Se Young Kim, Byung Won Cho, Kyung Yoon Chung, Jeong Yong Lee, Eric A. Stach, Wonyoung Chang, Using Real-time Electron Microscopy to Explore the Effects of Transition Metal Composition on the Local Thermal Stability in Charged LixNiyMnzCo1-y-zO2 Cathode Materials, Chemistry of Materials 27, 3927, 2015.

•Sooyeon Hwang, Seung Min Kim, Seong-Min Bak, Byung-Won Cho, Kyung Yoon Chung, Jeong Yong Lee, Wonyoung Chang, Eric A. Stach, Investigating Local Degradation and Thermal stability of Charged Ni-Based Cathode Materials through Real-Time Electron Microscopy, ACS Applied Materials & Interfaces 6, 15140, 2014.

•Sooyeon Hwang, Wonyoung Chang, Seung Min Kim, Dong Su, Dong Hyun Kim, Jeong Yong Lee, Kyung Yoon Chung, Eric A. Stach, Investigation of Changes in the Surface Structure of LixNi0.8Co0.15Al0.05O2 Cathode Materials Induced by the Initial Charge, Chemistry of Materials 26, 1084, 2014.

•Seong-Min Bak, Kyung-Wan Nam, Wonyoung Chang, Xiqian Yu, Enyuan Hu, Sooyeon Hwang, Eric A. Stach, Kwang-Bum Kim, Kyung Yoon Chung, and Xiao-Qing Yang, Correlating Structural Changes and Gas Evolution during the Thermal Decomposition of Charged LixNi0.8Co0.15Al0.05O2 Cathode Materials, Chemistry of Materials 25, 337, 2013.