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Komaba Lab
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The lab studies lithium, sodium, and potassium secondary batteries.
AboutAbout the lab
Aiming for next-generation energy conversion!
The Komaba Lab studies materials for new batteries that can convert energy efficiently, in order to help solve environmental and energy problems.
The lab aims to realize storage batteries with high energy, long life, and low environmental impact for portable devices and next-generation vehicles.
In addition to improving the performance of lithium-ion secondary batteries and capacitors, the lab synthesizes battery materials and investigates charge-discharge reactions, with the goal of putting sodium-ion and potassium-ion secondary batteries into practical use.
It also studies electrochemical sensors that selectively detect substances from electrical signals, and biofuel cells that use enzyme reactions to generate electricity.
Key terms
- Biofuel cell
- A fuel cell that uses enzymatic redox reactions to generate electricity from fuels such as sugars, alcohols, and oxygen
- Electric double-layer capacitor
- A capacitor that stores energy by accumulating charge in the electric double layer formed at the interface between an electrode and an electrolyte. Also called an EDLC
- Redox capacitor
- A capacitor that stores energy using redox reactions in addition to the electric double layer. It can achieve a higher capacity
ResearchResearch themes
To help solve the environmental and energy problems of the 21st century, the lab aims to create new materials that can convert between chemical energy and electrical energy more efficiently. It synthesizes battery materials and investigates charge-discharge reactions to improve the performance of lithium-ion secondary batteries and capacitors and to put sodium-ion and potassium-ion secondary batteries into practical use, and it also works on electrochemical sensors and biofuel cells.
*Illustrative imageHigh-performance lithium-ion secondary batteries
Lithium-ion secondary batteries are now widely used, from portable devices to electric vehicles, and have become indispensable in daily life. The lab aims to develop high-performance batteries with even higher energy.
*Illustrative imageSodium-ion secondary batteries
Since 2005, the lab has worked on batteries that use sodium, whose resources are virtually inexhaustible, in place of lithium, whose resources are unevenly distributed and whose stable supply is a concern. These batteries are expected to offer low cost, low environmental impact, and a high capacity comparable to current lithium-ion secondary batteries.
*Illustrative imagePotassium-ion secondary batteries
The lab studies batteries that use potassium, an abundant alkali metal like lithium and sodium, as the ion that carries electricity. They are expected to offer high energy density by operating at high voltage, as well as fast charging and discharging.
*Illustrative imageSupercapacitors
Electrochemical capacitors have the advantages of charging and discharging faster than secondary batteries and having a long life. They are broadly divided into electric double-layer capacitors and redox capacitors, which also use redox reactions.
MembersFaculty
The members of the Komaba Lab are faculty members, postdocs, visiting researchers, technicians, and doctoral, master's, and undergraduate students.As of 2020
- ProfessorShinichi Komaba
- Associate ProfessorKei Kubota
- Assistant ProfessorRyoichi Tatara
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “HEDBOX Battery Cell Framing System” Zoran Komlenski / CC BY 4.0 (cropped)
- High-performance lithium-ion secondary batteries: “Dry Cell Battery” Milton Wend / Public domain (cropped)
- Sodium-ion secondary batteries: “LR44 button cell cross section” TubeTimeUS / CC BY-SA 4.0 (cropped)
- Potassium-ion secondary batteries: “Coin-cells” Gerhard H Wrodnigg / CC BY-SA 2.5 (cropped)
- Supercapacitors: “К58-6А конденсатор-ионистор, Гириконд (03)” 155LA3 / CC BY 4.0 (cropped)
- Related lab (片山研究室): “Gold sputter machine” Tobias Brenner / CC BY-SA 4.0 (cropped)
- Related lab (工藤研究室): “U.S. Department of Energy - Science - )” U.S. Department of Energy from United States / Public domain (cropped)
- Related lab (湯浅研究室): “Mn(II) kompleksi monokoristall” Verner Sääsk / CC BY 4.0 (cropped)
- Related lab (大塚研究室): “Gold Nanoparticles in Cell Cytosol ( )” NIH Image Gallery from Bethesda, Maryland, USA / Public domain (cropped)
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