[서울신문] Battery additives that make high-capacity, high-speed charging batteries like automobile fuel additives appear

[서울신문] Battery additives that make high-capacity, high-speed charging batteries like automobile fuel additives appear

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Developing additives to increase electric vehicle battery capacity and enable high-speed charging As the number of electric vehicles increases, interest in batteries with fast charging and large storage capacity is increasing. Researchers in Korea are drawing attention for developing a technology that increases storage capacity and enables high-speed charging with only a small amount of additives.

▲ Developing additives that increase battery capacity and enable high-speed charging
As electric vehicles increase, interest in batteries that charge quickly and have a large storage capacity is increasing. Researchers in Korea are drawing attention for developing a technology that increases storage capacity and enables high-speed charging with only a small amount of additives.

Researchers in Korea have developed a method to increase the life and charging speed of electric vehicle batteries with only a small amount of additives.

The Ulsan Institute of Science and Technology (UNIST) announced on the 14th that a joint research team of the Department of Energy and Chemical Engineering and the Department of Chemistry has developed a battery electrolyte additive that can solve the instability of electrode material in large-capacity lithium-ion batteries. This additive technology was published in’Nature Communications’, an international academic journal in the field of basic science and engineering.

As electric vehicles become more popular, research on high-capacity lithium-ion batteries that can charge faster and go further with a single charge is active. To this end, a technology that replaces battery electrode materials with high nickel with a high content of silicon and nickel is drawing attention. The problem is that the volume of silicon anodes increases and decreases more than three times during charging and discharging, so durability is weak, and high nickel anodes are chemically unstable.

Accordingly, the research team made an electrolyte solution additive with a polymer material. The additive developed by the research team creates a protective film on the electrode with only a small amount of the additive, so that the silicon anode can be charged at high speed by reducing the mechanical overload caused by repeated volume changes. In addition, the research team explained that high-nickel anodes can increase battery capacity by preventing the internal metal from melting into the electrolyte.

It was confirmed that if the additive developed this time is added to a large-capacity battery, 81.5% of the initial capacity is maintained even after repeated charging and discharging 400 times. This is more than 10 to 30% higher performance than existing battery additives.

Professor Nam-soon Choi of the Department of Energy and Chemical Engineering at UNIST said, “This research will improve the electrochemical properties of high-density secondary batteries by supplementing the shortcomings of existing additives and help commercialize lithium-ion batteries with high energy density.”

Reporter Yoo Yong-ha [email protected]

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