New Mechanism Developed for High-Powered Lithium-ion Battery

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Researchers at Shinshu University in Japan are creating a thin, high-capacity lithium-ion battery, which will help in developing better energy storage systems for electric vehicles.

Lithium-ion batteries are used for electric vehicles with high energy densities. The researchers, led by Katsuya Teshima, director of the Center for Energy and Environmental Science, developed a design for high-capacity lithium-ion battery. Their findings were published in the inline journal Scientific Reports on August 2018.

Lithium-ion batteries has a high potential for energy storage, however, it requires a lot of force to make the battery disperse the energy that resulting in the battery losing its storage capacity. The researchers examined the electric and electrochemical properties of the high-voltage (>4.8 V, vs Li+/Li) cathode, the point of entrance of electrons in the battery cell.

Nobuyuki Zettsu, professor in the Center for Energy and Environmental Science and in the Department of Materials Chemistry at Shinshu University, said: “Various fundamental studies have been performed to investigate the effects of the surface coating modification; however, none of them led to a considerable performance enhancement of high-voltage cathode-based battery cells.”

The researchers developed an ultra-thin layer of fluoroalkylisilane and applied to the surface of the cathodes. They observed that after coating the surface of the active material with a self-assembled monolayer, the electrodes initiated transportation of electrons while stopping the other reactions occurring at the electrode and electrolyte interface. The coatings enhanced both the power density and the cyclability in high-voltage lithium-ion batteries.

The researchers are hoping to manufacture real battery cells for plug-in hybrid vehicles and battery electric vehicles using the same coating process.

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