Top Down Proposal Technology Area
Outline of the area
Consolidating the accumulated outcome of battery research and elemental technologies, and incorporating interdisciplinary knowledge, we promote a project research to accelerate the fundamental and basic research for practical use. Specifically, we do the R&D on leading candidates for the next-generation batteries such as an “all-solid state battery”, “Lithium-Sulfur battery with electrolyte cathode” and “advanced generation battery” including the multivalent ion battery.
In addition, we newly organize accelerating and promoting team for the practical use basically comprising a “special research unit for Li metal anode” and “analysis technology and base material technology”. Thus, we take up four team formation, and promote under this system.
The optimization group for the comprehensive battery system in each team has the responsibility and exercise leadership for the entire team working together, not only by materials research on such as the active material, the electrolyte and the separator, their mechanisms elucidation or the elemental technology, but also by making the maximum performance as a battery.
Improvement of capacity in the All-Solid-State battery
In the sulfide-based all-solid state battery, the target energy density has already been achieved ahead of the original R&D plan, and the research for practical use has been accelerated further upon cooperating with the Consortium for Lithium Ion Battery Technology and Evaluation Center (LIBTEC).
Cycle property of Lithium-Sulfur battery
A better cycle property (500 mAh/g after 800 cycles) has been obtained at the longterm cycling test, using the world’s first solvated ion liquid.
Operation of Magnesium battery(advanced generation battery)
A practically superior electrolytic liquid for Magnesium battery has been developed upon contriving the electrolytic solution.
Accelerating and Promoting Team for Practical Application
Professor, Tokyo Metropolitan University
Experts are cooperating to address the problems found in each battery system through ALCA-SPRING research.
The special research unit for Li metal anode tackles a safety concern and self-discharge problems of Li metal to realize practical Li-metal secondary batteries. Common issues for battery researches, such as the advanced analysis, battery fabrication, and supply of the base materials, are also all addressed on the basis of the cutting edge facilities and well-organized systems with a support from the battery platform.
All-Solid-State Battery Team
Professor, Osaka Prefecture University
We conduct research on All-Solid-State batteries using inorganic solid electrolytes for practical use.
The All-Solid-State battery does not use any flammable electrolytic solution, and accordingly, has been considered to be a highly safe battery that is also free from the risk of electrolyte leakage and is promising for application as an electric vehicle battery. This team is split into two sub-teams, “sulfide-based all-solid-state battery” and “oxide-based all-solid-state battery”, and involves fundamental technologies such as interface fabrication, materials processing, battery design and so on. Especially, the sulfide sub-team has led the research towards practical use upon cooperating with LIBTEC.
Lithium-Sulfur Battery Team
Professor, Yokohama National University
Lithium-Sulfur (Li-S) battery is one of the most promising candidates for beyond lithium-ion batteries because of its high theoretical energy density. The S-based cathode also has the advantages of high natural abundance, low price, and environmental friendliness. By combining with metallic Li or Si anodes, both of which have high theoretical capacity, and ionic liquid electrolytes, high performance Li-S battery will be realized.
We aim at avoiding the dissolution of intermediates from the S-based cathode, which is a fatal disadvantage in this battery, by utilizing an ionic liquid, offering very low solubilization in addition to its non-volatility and non-fl ammability. The issue of volume change of the cathode and anode materials by discharge and charge will be mitigated by the control of the nano structures. Towards practical use, we extend the research by cooperating with the LIBTEC.
Next Generation Battery Team
Professor, Tokyo Metropolitan University
The team explores the various advanced generation battery technologies, such as Mg batteries where two electron transfer is possible by divalent ions, metal-air batteries with high theoretical energy density, and batteries running by migration of negative ions (anions).
We focus on the development of innovative batteries which fulfi ll the requirement from electrical vehicle applications and enable to utilize sustainable natural energy, through the systematic R&D from fundamental material science to prospect battery materialization, and consequently will bring the novel promising battery technology to the light.