ACEPS-9

ACEPS-9 : The 9th Asian Conference on Electrochemical Power Sources 2017 / August 20 ~ 23, 2017 / HICO, Gyeongju, Korea

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Plenary Speakers

Prof. Ryoji Kanno
(Tokyo Institute of Technology)
Title; All-solid-state battery - Developments of materials and devices
  • Biography & Abstract
Biography
Ryoji Kanno is a professor at the School of Materials and Chemical Technology, Tokyo Institute of Technology. He received his PhD in science from Osaka University in 1985. Since 1980, Ryoji Kanno has been investigating materials for electrochemical energy conversion devices, particularly on lithium battery and solid oxide fuel cells. His challenge is for the development of new materials is finding superionic conducting materials for lithium battery electrodes, electrolytes for all solid-state battery, and for solid oxide fuel cells. He has developed new materials such as LGPS, which exceed the conductivity values of liquid electrolytes. He showed that the all-solid-state battery is a promising category of electrochemical energy storage devices for the next generation. He introduced various physico-chemical methods and the model electrode systems to the electrochemical materials to clarify the reaction mechanism during the electrochemical processes. He was awarded from Chemical Society of Japan (Award for Young Chemists, 1989), The Electrochemical Society of Japan (Award for Young Electrochemists 1988), and Kato foundation for Promotion of Science (Kato memorial award 2016). He is presently Associate Dean of School of Materials and Chemical Technology, Tokyo Institute of Technology.

Abstract
All-solid-state is an ideal form of batteries. The all-solid-state batteries offer an attractive option owing to their potential in improving the safety and achieving both high power and high energy densities. Despite extensive research efforts, the development of all-solid-state batteries still falls short of expectation largely because of the lack of suitable candidate materials for the electrolyte required for practical applications. Among the electrolytes proposed, the sulphide system is a candidate because of its high ionic conductivity. The Li10GeP2S12 (LGPS) exhibits high bulk conductivity of over 10-2 S cm-1 at room temperature and is promising for applications requiring batteries with high power and energy densities. On the other hand, material variations may provide suitable combinations of the electrodes and the electrolyte. The new LGPS systems make the all-solid-state batteries high energy and power densities. The present study reviews the materials developments of the lithium solid electrolytes, and focuses on the materials varieties of the solid electrolytes with the LGPS-type structures. The effects of conductivities and electrochemical stabilities for the electrolytes on the battery characteristics will be discussed.

Prof. Hong Li
(Chinese Academy of Sciences)
Title; In-situ solidified high energy density lithium batteries
  • Biography & Abstract
Biography
Hong LI received Ph.D degree in 1999 in the Institute of Physics, CAS. He is currently a professor in the same institute. He serves as Deputy director of Beijing National Laboratory for Condensed Matter Physics. Hong Li’s research is focused on developing nano-Si/C anode materials for high energy density Li-ion batteries, failure analysis of Li-ion batteries and rechargeable solid metal lithium batteries. Hong Li holds over fifty patents and published 260 peer-reviewed papers with a citation over 16000 times. He is in charge of the “High energy density Li batteries for electrical vehicles” project, a CAS strategic priority research program, and a “Materials and batteries for EV” project, a national key program. He serves as scientific committee member in direction of energy storage for MOST and MIIT. He is regional editor of Solid State Ionics and editor for Energy Storage Science and Technology (A Chinese journal).

Abstract
Jie Huang1,2, Wenjun Li1,2, Jiaze Lu1, Jiliang Qiu1,Hanyu Xu1, Shigang Ling1, Jieyun Zheng1,2, Huigeng Yu2, Liquan Chen1,2, Hong Li1,2
1Institute of Physics, Chinese Academy of Sciences,Beijing 100190
2Beijing WeLion New Energy Ltd., Beijing, 102402

Developing rechargeable batteries with high energy density, safety, fast charging rate, long cyclic performance and low cost is highly desirable for many applications. Many new solutions seem promising, including 300Wh/kg Li-ion batteries using Si-based anode and Ni-rich cathode, solid lithium batteries, Li-S and Li-air batteries. In view of commercialization and mass production, any new battery should satisfy all requirements from each application and has one item of outstanding performance at least. In addition, it would be better that the production is compatible with current automatic machines or only a few of machines have to be modified or redesigned. It is alos expected that the production speed is comparable to current level. Safety is the top concern for developing high energy density batteries. Li-ion cell containing 15-25wt% nonaqueous electrolyte suffers from thermal runway, which may cause fire and explosion. It is believed that replacing liquid electrolyte with solid electrolyte part or all of them should improve the safety of the cell. For solid batteries, one of the most difficult challenge is to maintain physical contact during thousands of charging and discharging cycles. This is not so easy since the active particles in anode or cathode will occur large and repeatable volume expansion and contraction. Solid electrolyte phase in cathode and anode should follow the volume variation of active particles, as in the case of liquid cell. Based on above consideration, we purpose a combined solution, in situ solidifying interface in high energy density lithium batteries. The solid electrolyte interphase will be formed chemically or electrochemically in the cell. Part or all nonaqueous electrolyte will convert into solid electrolyte . Some preliminary results will be reported in this report. In addition, efforts from CAS EV battery team on developing solid Li-ion, solid metalli lithium, solid Li-S and solid Li-air will be also reported.

Dr. Yu Morimoto
(Toyota Central R&D Labs., Inc.)
Title; Present status and challenges of Automotive Fuel Cells
  • Biography & Abstract
Biography
  • 1980 and 1982, BS and MS at Nagoya University respectively in Nuclear Engineering
  • 1982 Joined Toyota Central R&D labs., Inc. Started RD in secondary batteries.
  • 1990 Initialized PEFC R&D
  • 1991-1994 Ph,D. studies In Chemical Engineering at Case Western Reserve University, OH, USA. Adviser: Prof. E. Yearger, Topic: Methanol oxidizing cacalysts
  • 1995-present: R&D for automotive PEFCs

Research Area: PEFCs (catalysts, MEA structure, PEFC system), PE electrolyzer, secondary batteries

Abstract
Toyota has been commercially producing fuel cell vehicle MIRAI for more than two years. Although MIRAI has been greatly successful, the production is still limited and for wider commercialization, further advancement in materials and structure is necessary. In this talk, I would like to start with an industrial position of FCVs, emphasizing the comparison with purely battery electric vehicles. Then, the challenges we are facing toward a wide distribution of FCVs are mentioned and finally, our recent R&D topics are introduced.

Dr. Dongmin Im
(Samsung Advanced Institute of Technology)
Title; Li-air batteries: Towards 500 Wh/kg and beyond
  • Biography & Abstract
Biography
Dongmin Im received his BS (1992) and MS (1994) degrees in Chemical Technology from Seoul National University. He worked for Hankook Tire Co. from 1994 to 1999 and received his PhD degree in Materials Science & Engineering in 2002 from the University of Texas at Austin. He joined Samsung Advanced Institute of Technology (SAIT) in 2003 and became Master (a vice president position) there in 2013. Dongmin Im’s research focuses on chemistry and materials for rechargeable batteries. His experience covers lead-acid battery, rechargeable alkaline battery, lithium-ion battery, and various next generation batteries. His current research activity is mainly on the batteries employing lithium metal anode such as lithium metal polymer battery and lithium-air battery. He has co-authored 35 publications in peer-reviewed journals and holds 43 granted US patents.

Abstract
The performance of Li-ion batteries for electric vehicles (EV) are continuously improving and now the driving range of EV over 300 km per single charge becomes a standard. However, heavy weight of battery pack limits the efficiency of EV and cost of battery is an important factor keeping EV market from flourishing. Li-air battery can provide solutions for those issues since its gravimetric energy density is expected to be unprecedentedly high, lessening the weight and the cost (in $/Wh) of battery pack simultaneously. Notwithstanding those promising features, Li-air battery is predicted to be commercialized after year 2030 due to many technical difficulties. Two major reasons are low durability and unsatisfactory actual energy density. Firstly, very reactive compounds are generated in the cathode chemically attacking almost all components of Li-air battery and lowering the cycle life. Robust electrolyte systems are being heavily pursued, but practically useful one is yet to be found. Secondly, the actual energy density is much lower than its potential value. The projection from reports typically indicates even lower value than that of commercial Li-ion battery. A large quantity of electrolyte is added (10~100 times of carbon or catalyst weight), the areal capacity is low due to slow kinetics, and other components such as current collector, packaging material, gas diffusion layer add significant weight to the cell. The focus of this presentation is on the methods to achieve such potentially high gravimetric energy density in practical Li-air cells. We have developed a new type of Li-air cell with three-dimensional folding structure. It will be shown that, in combination with careful control of the amount of electrolyte, 500 Wh/kg or even higher energy density can be achieved with Li-air cells of ~ 1 Ah or higher capacity. A new way of constituting battery module with maximized volume efficiency is also going to be proposed with some simulation results.