Research finds that the cause of battery thermal runaway lies in the surface of the material

　　Lithium batteries have been widely used in mobile phones, computers and cars and have become an indispensable component. However, lithium batteries can also spontaneously ignite and explode due to thermal runaway. Researchers have been looking for causes and solutions to battery overheating. Recently, researchers at the University of Texas at Dallas have made a new discovery. The root cause of lithium-ion battery overheating is not within the material, but on the surface of the material. Improving the stability of the material can create High capacity and safe battery. When the battery is charged and discharged, the battery material is also constantly declining, and the energy released will also increase the battery heat. Dr. Kyeongjae Cho, professor of materials science and engineering, said, "Only the surface of the battery cathode material is the problem, there is no problem inside the battery." Lithium batteries are mainly composed of positive electrodes, negative electrodes, separators and electrolytes, and lithium ions move between both ends of the electrodes through the electrolytes. , when the battery is charged and discharged, the battery surface material will release oxygen, thereby producing metal nickel dust. However, when the transmission channel of lithium ions is blocked by nickel dust, the battery capacity will decrease rapidly. As the heat increases, the probability of battery fire and explosion will also increase. Dr. KyeongjaeCho said that oxide coating can be added to the surface of battery materials to reconstruct the structure of the battery. This is also one of the methods to ensure the safety of lithium batteries. This can increase battery capacity by 20% to 30%, and the modified battery can withstand longer charging times. But the problem is that research and experiments can take quite a long time.

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