18650 lithium ion battery

　　The reason for the decline in capacity of 18650 lithium ion battery has been found and will be an area of future research

　　In our daily lives, our mobile phones, laptops, hybrid and electric cars all rely on batteries to power us. Currently, lithium-ion batteries are most commonly used on the market. However, increased usage may lead to a shortage of lithium and increase production costs. 18650 lithium ion battery are receiving increasing attention as potential alternatives. This kind of battery has good performance, and sodium metal is cheap and abundant. However, 18650 lithium ion battery have a shorter service life than lithium-ion batteries. According to foreign media reports, Chris VandeWalle, a computational materials scientist at the University of California, Santa Barbara, and others discovered that the reason for the decline in sodium battery capacity is that the unexpected presence of hydrogen in the battery causes the battery's electrodes to degrade.

　　"During the manufacturing process of cathode materials, hydrogen is usually generated and can also be absorbed from the surrounding environment or the electrolyte," the researchers said. "It is known that hydrogen can strongly affect the performance of electronic materials, and sodium manganese dioxide (NaMnO2) It is a common cathode material in 18650 lithium ion battery. We are curious about what impact hydrogen can have on NaMnO2. "To study this issue, the researchers used computational techniques to predict the impact of the presence of impurities on the structure of the material. chemical effects. "

　　Professor Peelaers from the University of Kansas said the key discovery was: "We quickly realized that hydrogen easily penetrates the material, releasing manganese atoms from the manganese oxide skeleton that connects the material. Moreover, the removal of manganese is irreversible, which It will reduce the battery capacity and eventually lead to battery degradation.”

　　The studies were conducted in VanDeWalle's Computational Materials Group at UC Santa Barbara. VandeWalle said: "Early studies showed that the loss of manganese may occur at the interface of the electrolyte or may be related to a phase change, but the actual trigger has not been determined. The new research results show that as long as there is hydrogen, it can occur anywhere in the material. Loss of manganese can occur. Because hydrogen atoms are small and highly reactive, hydrogen is a common contaminant in materials. Now that its harmful effects have been flagged, measures can be taken during battery manufacturing and packaging. Prevents the penetration of hydrogen, thereby improving battery performance.”

　　In fact, researchers suspect that even common lithium-ion batteries may be adversely affected by the unexpected presence of hydrogen. The reason why lithium-ion batteries have fewer problems is because the preparation method is more mature, or because lithium batteries have stronger hydrogen resistance. The specific reason is not yet clear. This will be an area of research in the future.

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