Three-layer electrode structure design to improve the energy density of lithium batteries 30%

Yang Yuan, an assistant professor of materials science and engineering at Columbia University, has developed a completely new approach to improving the energy density of lithium-ion batteries. His three-layer structure of the electrode in the exposed air environment to maintain stability, making the battery more durable, manufacturing costs further reduced. The study can increase the energy density of lithium batteries 10-30%, the related papers in early October published in the "Nano Letters" journals.

Comparison of Graphite / PMMA / Li Triple-Layer Electrode Before (Left) and After (Right) Dipping in Battery Electrolyte for 24 Hours. The triple layer electrode is stable in air prior to immersion in the electrolyte. After soaking, lithium reacts with graphite and the color turns yellow. Image Source: Columbia University

"When lithium batteries are first charged, they lose up to 5-20% of their energy on the first cycle," said Yang Yuan. "We have been able to avoid this loss through structural improvements. At the same time, our The method has great potential to increase battery life and is expected to be used in portable electronics and electric vehicles. "

During the first charge after it is produced, a portion of the electrolyte in the lithium battery changes from liquid to solid due to the reduction reaction and adheres to the negative electrode of the battery. This process is irreversible, reducing the battery's stored energy.

With current electrode fabrication technology, this process has a loss of about 10%, but for high capacity next-generation negative materials, such as silicon, the loss will be 20-30%, which will greatly reduce the battery The actual available capacity.

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