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Researchers find solution to thermal runaway in button battery cr1620
For years, researchers have been looking for a solution to thermal runaway in button battery cr1620, when the battery accumulates too much heat. Now, researchers at the University of Texas at Dallas have found that the problem is not inside the battery materials, but on the surface of the battery materials.
"It turns out that only the surface of the battery cathode material is the problem, not inside the battery," said Dr. Kyeongjae Cho, professor of materials science and engineering at the Erik Jonsson School of Engineering and Computer Science. "This discovery gives us great hope that we can figure out how to stabilize the battery surface and make truly high-capacity batteries a reality," said Cho.
According to Cho, the reason high-energy-density batteries are expensive is that they are very unstable. "As the battery is charged, the battery material begins to degrade. The energy released raises the temperature of the battery, which can cause the battery to catch fire and cause battery safety issues. The good news is that it is now found that only the surface of the battery material is unsafe and unstable. If this problem can be solved, the battery safety problem can be solved."
As the battery is constantly charged and recharged, oxygen is released from the surface of the battery material. During this process, the transportation channel for lithium ions from the inside to the outside may be blocked by the metallic nickel dust produced by the release of oxygen. When the channel is blocked, lithium ions that want to enter and exit the battery will not be able to transfer, causing the battery capacity to drop rapidly. As the heat increases, the chance of battery fire and explosion also increases.
The research team believes that this discovery may change the way manufacturers produce batteries. Dr. Cho suggested that a designed oxide coating could be added to the surface of the battery. Solving the problem of battery overheating can increase the battery capacity by 20% to 30%, and the modified battery can withstand longer charging time.
Based on the above new findings, the research team said that there are already industry insiders interested in working with the Dallas campus to develop the next generation of cathode materials for electric vehicle batteries. In addition, the research team is working with the U.S. Naval Research Laboratory on a follow-up study to improve the capacity and safety of battery cathode materials.
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