Challenges to process science for realizing oxide-type solid-state batteries

15:00-15:40 Pre-Registration required

National Institute for Materials Science

Center for Green Research on Energy and Environmental Materials (GREEN)

Director

Dr. Kazunori Takada

【Profile】

He earned his B.S. and M.S. from Osaka University in 1984 and 1986, respectively, and his Ph.D. from Osaka City University in 1991. He belonged to Matsushita Electric Industrial (now Panasonic) from 1986 to 1999. After that, he joined National Institute for Research in Inorganic Materials, which was merged with National Institute for Metals into National Institute for Materials Science (NIMS). He is Deputy Director of Center for Green Research on Energy and Environmental Materials (GREEN) in NIMS from 2018.

【Abstract】

Solid electrolytes provide high reliability to batteries, which is strongly required for batteries for vehicles and stationary application in the coming low-carbon society. Solid-state batteries using sulfide solid electrolytes have gained high performance and are under development aiming at vehicle application. On the other hand, sulfide electrolytes are unstable substance, which are decomposed even in ambient atmosphere. Although oxide solid electrolytes show higher chemical stability to overcome the problem, the performance of oxide-type batteries is much lower than that anticipated from the properties of the electrolytes. "Materealize Project" in National Institute for Materials Science is aimed at establishing process science that leads the electrolyte properties to the battery performance. I will present expectations to solid-state batteries in achieving carbon neutrality and our challenges for realizing oxide-type solid-state batteries in the "Materealize Project".

Challenge to low-temperature sintering for oxide-based solid batteries

15:40-16:00 Pre-Registration required

National Institute for Materials Science

Center for Green Research on Energy and Environmental Materials

Senior Researcher

Dr. Shogo Miyoshi

【Profile】

Shogo Miyoshi received his Ph. D. from Graduate School of Engineering, Tohoku University in 2004. After serving as a postdoctoral researcher at Kyushu University and RWTH Aachen University, he was appointed as an assistant professor at Graduate School of Engineering, The University of Tokyo in 2007. From 2016, he has been appointed as a senior researcher at Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science. He specializes in solid-state chemistry.

【Abstract】

A desirable fabrication process of all-solid-state lithium-ion batteries with oxide-based electrolytes is co-firing, which simultaneously attains densification of electrolytes as well as junction between electrolytes and electrode active materials. However, high-temperature firing often leads to chemical reaction between electrolytes and electrodes to form undesirable compounds. In this presentation, the author will introduce an investigation to improve sinterability of oxide-based electrolytes, which contribute to lowering firing temperature so as to prevent the undesirable reactions during co-firing processes.

Approach for predicting reaction phase at co-sintering interface in oxide-based all-solid batteries.

16:00-16:20 Pre-Registration required

National Institute for Materials Science

Research Center for Structural Materials

Senior Researcher

Dr. Machiko Ode

【Profile】

Senior Researcher, Computational Structural Materials Group, Research Center for Structural Materials, National Institute for Materials Science(NIMS)
Research Interests: Microstructure evolution and phase transitions in materials, Thermodynamics and phase-field theory

【Abstract】

All-solid-state lithium-ion batteries are classified into sulfide-based and oxide-based electrolytes based on the type of electrolyte. Sulfide-based electrolytes have sevral advantages such as high conductivity and formability, but the moisture stability of sulfide must be addressed becouse hydrogen sulfide is generated.
On the other hand, oxide-based electrolytes are chemically stable, however, they require sintering process to form batteries, and the precipitation of unexpected phases during the high temperature process at the interface between the electrolyte and active material is a problem. We report results of thermodynamic calculations to predict the reaction phases in oxide-based all-solid-state batteries such as LiCoO2 (LCO)/Li1.3Al0.3Ti1.7(PO4)3 (LATP) and compare them with experimental observations.

Material and process development for realization of multi layer all-solid-state battery with oxide solid state electrolyte

16:20-16:40 Pre-Registration required

TAIYO YUDEN CO., LTD.

Materials Research & Development Department 1 Reserch and Developmnet Laboratry

Manager

Dr. Chie Kawamura

【Abstract】

We will show an application of our solid-state oxide powder synthesis technology to the fabrication of oxide based all solid-state battery materials. We will also show our research activity of small all solid-state battery with laminated process of MLCC.

Development of LLZ oxide solid electrolyte and solid-state battery

16:40-17:00 Pre-Registration required

NGK SPARK PLUG CO., LTD.

R&D Engineering Group

Senior Specialist

Dr. Hideaki Hikosaka

【Abstract】

Solid-state batteries are being actively developed as the most promising candidate for next-generation batteries. Sulfide-based solid-state batteries are leading the development. There are high hopes for safer oxide-based one. Oxide-based solid-state batteries require sintering, which makes it difficult to form interface and size up. We are trying to solve this problem by using non-sintered oxide type. In this presentation, we first talk about the development of Mg, Sr-substituted Li7La3Zr2O12 solid electrolyte at NGK SPARK PLUG CO., LTD, followed by the development of oxide-based non-sintered batteries using this LLZO electrolytes.