Dr. Hikari Sakaebe is currently working as Prime Senior Researcher at National Institute of Advanced Industrial Science and Technology (AIST) and as a professor at Kyushu University. Dr. Sakaebe’s research interests mainly cover the development of novel materials with high energy for rechargeable batteries including all-solid-state batteries. Advanced analysis techniques for characterization of these developed materials and degradation mechanism of Li-ion and next generation batteries have been actively tackled. She has led AIST group in RISING, RISING2, and now working on the development of iron-based materials in RISING3. She is also serving as the Associate Editor of “Electrochemistry” published by The Electrochemical Society of Japan and as the editorial board member of “J. Power Sources Advance”.
Plenary Talk: R&D of iron-based electrode for high energy batteries
In order to popularize electric vehicles, large-scale energy storage systems, and so on, high performance batteries are necessary. At the same time, it will accelerate these spreads if the batteries could be manufactured without Co and Ni used in state-of -the-art Li-ion batteries. Iron-based material is one effective solution and olivine LiFePO4 is a typical and rare electrode material that consists of iron and that have been commercialized. This material provides longer life, however, energy density is not enough for realization of high energy batteries. Authors have developed novel iron materials for new battery systems with higher energy density (300 – 500Wh/kg). Li8FeS5 is one example of our achievement. This shows mode than 700 mAh/g and works with less amount of conducting carbon compared to S8 electrode. FeF3 also attracts the attentions because of its larger capacity. This material can be operated as both of Li-conversion and fluoride-shuttle system. Comparison of the electrochemical process will be discussed.
Prof. Yung-Eun Sung got a Ph.D. in University of Illinois at Urbana-Champaign and investigated electrochemistry at University of Texas at Austin and Gwangju Institute of Science & Technology(GIST). He joined Seoul National University as professor since 2004. Now he is also an Associate Director in the Center for Nanoparticle Research at Institute of Basic Science. He serves as President of the Korean Electrochemical Society in 2022-23. His research has focused on electrochemistry in the area of fuel cells, battery, and other energy conversion and storage. He has published more than 500 technical papers
Plenary Talk: Fuel Cell Related Technologies
Fuel cells and water electrolyzers are promising electrochemical energy conversion devices to solve the climate change problem caused by greenhouse gas emission. Although advances have been made in recent years by various nanomaterials and structural designs, there are still many improvements to be solved. In particular, the problem of material design for high durability is emerging due to the severe instability in the operating conditions of nanostructure. In addition, lowering the use of Pt group metals (PGMs) remains an important issue for the commercial application of these devices. Therefore, it became a timely issue to find an effective strategy to reduce the need for PGM while maintaining the high activity and durability of the electrocatalyst. In this lecture, I would like to talk about design strategies and the performance and durability of various PGM and non-PGM nanomaterials. Also, based on the electrochemical understanding of the electrode-electrolyte interface, I will introduce our research achievements in device-level fuel cells and water electrolyzers.
Prof. Nae-Lih Nick Wu is currently a Distinguished Professor at the Department of Chemical Engineering, National Taiwan University. Dr. Wu’s research interests include the synthesis and characterization of electrode and component materials for electrochemical devices, including supercapacitors and rechargeable batteries; development of advanced in-situ/in-operando analytic methodologies based on synchrotron facilities in characterizing these materials and devices, particularly for energy storage applications; and nanomaterials synthesis and applications. He is currently also serving as the program director of the Chemical Engineering Division, National Science and Technology Council in Taiwan, and an associate editor of Journal of the Electrochemical Society
Plenary Talk: Interfaces Modification with Functional Polymers for Enhanced Performance and Safety of Li-ion Batteries
While the theoretical capacity of an electrode active material is determined by its bulk structure, the various practical performance indices, such as rate capability, cycle stability and safety, of the electrode heavily depend on the properties of its interface with the electrolyte. Conventionally, chemical additives are introduced into the electrolyte and they are designed to undergo redox reactions to form a surface coating layer at the surfaces of the active materials upon charge/discharge in order to create favorable interfacial properties. While this approach is capable of creating a conformal coating at the “active surfaces” in a precise manner, the composition and structure, and hence the eventual functionality of the coating are affected by very complex and often unpredictable interactions between the additives, and the electrolytes and the charge-discharge formation protocol. Alternatively, a surface-modifying coating with designed compositions can be applied to the active-material surfaces before electrode formation. The compositions and structures of the coating can be pre-designed with desired function(s) of its components. The pre-design concept selects a wide variety of chemical compositions containing different combinations of organic and inorganic materials to serve various purposes. The coatings are typically inert to the redox reactions involved in the battery operation, and they are hence sustainable and not consumed along cycling. Promising examples of using polymeric materials for modifying various LIB electrode materials, including both anodes and cathodes, will be presented in the context of enhancements in rate capability, cycle stability, and safety.
Prof. Yong Yang is a distinguished professor in Chemistry in the State Key Lab for Physical Chemistry of Solid Surface at Xiamen University. He also serves as Editor for J. Power Sources and the 1st Vice-President of International Battery Materials Association (IBA) and Advisory Board Member of International Meeting of Lithium Battery (IMLB). His main research interests are new electrode/electrolyte materials for Li/Na-ion batteries, Solid state batteries, Operando techniques such as solid state NMR techniques and reaction mechanism study in electrochemical energy storage and conversion system.
Plenary Talk: The Electrode/Electrolyte Interfacial Issues in Solid State Batteries
The stability of electrode/electrolyte interfaces play a key role in the performance-determination of solid-state batteries . Such interfacial stability including not only the chemical/electrochemical stability such as side reactions, but also physical stability such as stable physical contact between solid electrode and solid electrolytes which may not a big issue in liquid-type Li-ion batteries [2,3]. In this presentation, we will present some newest research [4,5] in the comprehensive characterization and understanding of the effects of interfacial behaviour on the electrochemical performance of the oxide-type or sulfide-type solid state batteries with high capacity cathodes such as Ni-rich and Sulfur-based cathodes.
1. Y. Yang, Solid State Electrochemistry; First Edition, Chem. Indus. Press, Beijing, 2017
2. Y.X. Xiang, et al; Materials Today; 2020 ，36，139-157
3. D.W.Wang, et al; Advanced Energy Mater.; 2020, 1–59.
4. J. P. Zhu, et al; Chem. Mater.; 2020, 32，4998-5003
5. X.S.Liu, et al; Advanced Energy Materials; 2021，11, 2003583
6. Z.R.Chen, et al; ACS Energy Lett.; 2022, 7(8), 2761-2770