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NPL and UKRI investment for innovation in time resilience, dissemination and application.
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Juyeon Park

Juyeon Park

Principal Research Scientist

Juyeon is an expert in electrochemical testing and materials science, specialising in high-energy density Li-ion batteries and next-generation energy storage. She focuses on the development of standard test protocols, including holistic approaches to characterising battery performance and cell aging/failure mechanisms.

Areas of interest

Juyeon is working on a range of battery projects to create innovative standard test methods as diagnostic tools, and to solve both scientific and engineering problems for battery performance and degradation.

Her current research interests include:

  • the development of in situ / operando measurements for energy-related systems
  • standardisation of reference cell design and improvements to electrochemical impedance spectroscopy analysis
  • cost-effective performance assessment for battery second life
  • identification and validation of key experimental parameters for electrochemical modelling to predict battery life and State of Health (SoH)
  • correlation of electrochemical measurements with dimensional metrology and post-mortem analysis
  • battery balancing and thermal management for battery longevity
  • fault tree analysis of failure modes for safety issues
  • next-generation energy storage systems (e.g. Na-ion batteries and solid-state electrolyte batteries)
  • hybrid energy-related systems (photovoltaic cells, hydrogen technologies, supercapacitor-to-energy-storage systems)
  • fundamental electrochemistry (corrosion of noble metals)


Juyeon received her PhD in Physical Chemistry from Seoul National University, South Korea, where her research focused on characterising electronic structure, morphology and charge transfer dynamics of organic/(semi)metal interfaces using pioneering optical techniques applicable for multi-layered device systems such as photovoltaic cells, OLEDs, photo-catalytic systems and batteries. Following this she undertook academic research at KRISS (Korea Research Institute of Standards and Science), the Free University of Berlin (Germany) and in collaboration with RIKEN and Osaka University (Japan) focusing on fundamental understanding of material properties and their dynamics in practical systems; she then moved to Samsung SDI (Korea), which is a Tier 1 lithium-ion battery manufacturer.

At Samsung, Juyeon led the electrochemical contribution to establishing a database for battery modelling, developing a holistic approach to cell degradation mechanism based on post mortem analysis correlated to electrochemical tests. As a principal engineer she led automotive projects for Jaguar Land Rover, BMW and advised on energy storage system (ESS) projects, considering cell validation, safety and the quality control of mass production. She also published internal papers on ToF-SIMS analysis of battery electrode material and on electrochemical characterisation of mechanisms of functional additives. Juyeon moved to NPL in August 2018.

Juyeon is a Fellow of the Institute of Materials, Minerals & Mining (FIMMM), a member of the Electrochemical Society (ECS), and a Certified Quality Engineer (CQE) of the American Society for Quality (ASQ).

Selected Publications

1. Application of electrochemical impedance spectroscopy to commercial Li-ion cells: A review, N. Meddings, M. Heinrich, F. Overney, J.-S. Lee, V. Ruiz, E. Napolitano, S. Seitz, G. Hinds, R. Raccichini, M. Gaberšček, J. Park, J. Power Sources 480, 228742 (2020)

2. Identifying Defects in Li-Ion Cells Using Ultrasound Acoustic Measurements, J.B. Robinson, R.E. Owen, M.D.R. Kok, M. Maier, J. Majasan, M. Braglia, R. Stocker, T. Amietszajew, A.J. Roberts, R. Bhagat, D. Billsson, J.Z. Olson, J. Park, G. Hinds, A.A. Tidblad, D.J.L. Brett, P.R. Shearing, J. Electrochem. Soc. 167, 120530 (2020)

3. Microstructural Evolution of Battery Electrodes During Calendering, X. Lu, S.R. Daemi, A. Bertei, M.D.R. Kok, K.B. O'Regan, L. Rasha, J. Park, G. Hinds, E. Kendrick, D.J.L. Brett, P.R. Shearing, Joule 4, 2746-2768 (2020)

4. On-Surface Evolution of meso-Isomerism in Two-dimensional Supramolecular Assemblies, J. Park, J.-H. Kim, S. Bak, K. Tahara, J. Jung, M. Kawai, Y. Tobe, Y. Kim, Angew. Chem. Int. Ed. 58, 9611-9618 (2019)

5. Cathode Solid Electrolyte Interface’s Function Originated from Salt Type Additives in Lithium Ion Batteries, Y. Kaneko, J. Park, H. Yokotsuji, M. Odawara, H. Takase, M. Ue, M.-E. Lee, Electrochim. Acta 222, 271-279 (2016)

6. Image Potential State Mediated Excitation at Rubrene/Graphite Interface, J. Park, T. Ueba, R. Terawaki, T. Yamada, H.S. Kato, and T. Munakata, J. Phys. Chem. C 116, 5821-5826 (2012)

7. A High-Density Array of Size-Controlled Silicon Nanodots in a Silicon Oxide Nanowire by Electron-Stimulated Oxygen Expulsion, G.-S. Park, E.K. Lee, J.H. Lee, J. Park, S.K. Kim, X.S. Li, J.C. Park, J.G. Chung, W.S. Jeon, S. Heo, J.H. Lee, B.L. Choi and J.M. Kim, Nano Lett. 9, 1780-1786 (2009)

8. Magnetic and Microstructural Properties on Mn- and Ru-doped Hexagonal Barium Ferrites,  N.H. Hur, J.Y. Park, J. Dho, S.J. Kim, E.K. Lee, IEEE Trans. Magn. 40, 2790-2792 (2004)

9. 1H NMR Study of Pyridine-type Ligands coordinated to the Paramagnetic Polyoxometalates, [CoIIW11MO39]n- (M=CoII, NiII, CuII, or FeIII), J. Park, J.Y. Kim, H. So, J. Liu, Inorg. Chim. Acta 319, 8-14 (2001)