A NIMS research team led by Yoshimi Kubo and Akihiro Nomura has developed lithium-air batteries with electric storage capacity 15 times greater than the capacity of conventional lithium-ion batteries using carbon nanotubes as an air electrode material.
The current lithium-ion batteries have advantages of compactness, high voltages, and long life, but their energy densities, which represent electric storage capacities, have nearly reached their limit.
The battery as theorized may have drastically large capacity and reduce production costs.
Conventional battery research usually focuses on basic studies of battery reactions using small amounts of materials, and therefore is not designed to demonstrate large battery capacities using cells of actual size and shape.
This value represents about 15 times greater capacity compared to the capacity of conventional lithium-ion batteries. The researchers think that the battery’s large capacity can be attributed to CNTs’ large surface area and flexible structure.
In light of these results, the scientists aim to develop practical, high-capacity lithium-air batteries by exploring techniques to increase energy density in cell layer stacks, and removing impurities from the air.