Points of Interest

Development of next-generation batteries with high energy density that can be used for electric vehicle (EV) applications is highly desired. AIST has developed metal polysulfide materials which display unique electrochemical performance.

Voltage-capacity plots of conventional electrode materials (oxides)
in comparison to the newly developed materials (sulfides)

It was difficult to enhance the capacity of conventional materials, as only the transition metal cation is responsible for the redox process during the (dis)charge reaction. However, by using the newly-developed polysulfide materials, redox process not only entails the participation of the transition metal (cation) but also sulfur (anion). The cumulative participation of both the metal and sulfur during the redox process in these polysulfide materials is an epoch-making process to achieving high capacities, beyond the conventional materials.

*Part of this work was conducted under the auspices of NEDO RISING project.

Links

• RISING Battery Project (Ended March 31^th, 2016)
• Press Release: Reducing Overvoltage of Lithium-Air Batteries (July 24^th, 2015)
• AIST TODAY: Li-air batteries using a gel and an ionic liquid (June, 2013)[PDF:241KB]
• AIST TODAY: Development of a Lithium-Ion Battery with a High-Capacity Silicon-Based Negative Electrode (December, 2012)[PDF:1.9MB]
• AIST TODAY: Using Computational Science to Investigate the Interface between the Electrolyte and Electrode in a Lithium-Ion Secondary Battery (December, 2012)[PDF:1.9MB]
• AIST TODAY: Development of Rechargeable Batteries with Organic Substances (December, 2012)[PDF:1.9MB]
• AIST TODAY: Development of a New Titanium Oxide Negative Electrode Material for Next-Generation Lithium-Ion Batteries (December, 2012)[PDF:1.9MB]