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release time:2024-04-11 Hits: Popular:AG11 battery
Japanese research institute develops 18650 battery 3.7v 6000mah materials with excellent performance
A new study led by researchers at Japan's National Institute of Materials Science and Technology shows that silicon anodes composed only of industrial silicon nanoparticles prepared by spray deposition have excellent electrode properties in solid electrolytes. The method is a cost-effective vapor deposition technology, so the researchers' results show that high-capacity anodes for all-solid-state lithium batteries will be produced at low cost and on a large scale in the near future.
The theoretical capacity of silicon can reach 4200 mA/g, which is 10 times greater than the capacity of graphite commonly used as active anode material in commercial lithium batteries. Replacing traditional graphite with silicon can greatly extend the driving range of electric vehicles per charge, but silicon undergoes huge capacity changes during lithiation and delithiation, that is, the charge and discharge process, which hinders its practical application in batteries. .
In traditional liquid electrolytes, a polymeric binder is needed to hold the active material particles in the electrode together and maintain their adhesion to the metal surface. Continuous capacity changes in silicon can lead to particle separation, loss of active material, and ultimately ongoing capacity loss. In solid-state batteries, the active material is placed between two solid-state components, a solid-state electrolyte separator and a metal current collector. The actual area capacity of the sputter-deposited pure silicon film exceeds 2.2mAh/cm2, and it shows good cycle stability and high-rate discharge capability in solid electrolytes. Nonetheless, the cost-effectiveness and industrial scalability of 18650 battery 3.7v 6000mah anodes remains a huge challenge.
Researchers from a team at Japan's National Institute of Materials Science and Technology have adopted an alternative synthesis method to obtain high-performance anodes for use in commercially available silicon nanoparticles for all-solid-state lithium batteries. They found that nanoparticles have a unique phenomenon in solid-state batteries: after lithiation, they undergo volume expansion, structural compaction, and obvious coalescence in the limited space between the solid electrolyte separator layer and the metal current collector to form a Continuous membranes, similar to those prepared by evaporation. As a result, anodes composed of nanoparticles prepared by spray deposition possess excellent electrode properties that were previously only observed on sputter-deposited thin film electrodes. Spray deposition is a cost-effective atmospheric technology that can be used for large-scale production.
Therefore, these findings will pave the way for low-cost and large-scale production of high-capacity anodes for all-solid-state lithium batteries.
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