“Shall I increase the mileage of electric vehicles?” Development of battery material with 25% capacity

The Korea Advanced Institute of Science and Technology (KAIST) announced on the 3rd that Professor Eunae Cho’s research team has developed a next-generation lithium battery material that is more than 25% larger in capacity than existing battery cathode materials and is stable.

In order to increase the mileage of an electric vehicle, it is necessary to mount a large number of batteries, which causes the price to rise.

Existing electric vehicle batteries mainly use’high nickel’ anode material with a high nickel content, and the capacity per gram is 200mAh (milliampere hour).

The research team proposed an alternative lithium-excessive anode material that has an usable capacity of 250mAh and can store 25% more energy than conventional high-nickel materials.

However, the lithium-excessive positive electrode material has a problem in that oxygen, which constitutes the oxide, causes an irreversible (irreversible) reduction reaction and escapes between the first charge and discharge.

The lithium-excessive cathode material needs to increase its capacity by using the oxidation/reduction reaction of oxygen ions, which causes the structure of the oxide cathode material to be destroyed and battery performance to deteriorate.

The research team solved the problem by adding vanadium ions to the surface of the anode material.

The reversibility of the lithium-excessive positive electrode material added with vanadium at the first charging and discharging was 81%, which was higher than that of the pure lithium-excessive positive electrode material (69%).

Professor Eunae Cho said, “This is the principle that the added vanadium ions change the electronic structure of the oxygen ions in the anode material to enable reversible oxidation and reduction reactions during charging and discharging.” said.

The results of this study were published in the online edition of the international journal’Advanced Science’ on January 29th.

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