Lithium-ion batteries become "smaller" and the performance of secondary batteries will be greatly improved
In recent years, electronic products such as mobile phones and notebook computers have been developing to be lighter and thinner. Among them, the battery life of the secondary (rechargeable) battery remains the same or smaller, but the battery life is continuously improved. In addition, in the era of new energy vehicles, how to have a longer range of electricity in a limited body space is also a problem that needs to be solved. In order to make the next generation of lithium batteries lighter, the Tianjin University scientific team developed the "sulfur template method".
In response to the increasing demand, researchers have been working on the performance improvement of secondary batteries. They found that nanotechnology can make batteries "lighter" and "faster", but due to the lower density of nanomaterials, "smaller" has become a difficult problem for researchers in the field of energy storage.
Recently, Professor Yang Quanhong from the School of Chemical Engineering of Tianjin University and his research team proposed a "sulfur template method". They finally completed the "tailor-made" of graphene encapsulation of active particles by designing anode materials for high volume energy density lithium-ion batteries. Make it possible to make lithium-ion batteries "smaller".
Tirdami medžiagų savybes, mokslininkai nustatė, kad nors ličio{0}}jonų baterijos jau turi didelį energijos tankį, tikimasi, kad ne-anglies medžiagos, tokios kaip alavas ir silicis, pakeis dabartinį komercinį grafitą ir labai pagerins ličio -jonų baterijų masės energijos tankis. Tačiau šių dviejų medžiagų apimties didinimo problema riboja jų taikymą ir plėtrą.
Todėl mokslininkai išsprendė šią problemą naudodami anglies narvelio struktūras, pagamintas iš patobulintų anglies nanomedžiagų. Remdamiesi grafeno sąsajos agregatu, jie išrado sieros{0}} šabloninę technologiją, skirtą tiksliai pritaikyti tankius porėtus anglies narvus.
In the process of constructing dense graphene networks using capillary evaporation techniques, the researchers introduced sulfur as a flowable volume template to complete the customization of graphene-carbon coats for non-carbon active particles. In the experiment, by modulating the amount of sulfur template used, they could precisely control the three-dimensional graphene-carbon cage structure and achieve a "fit" coating of the non-carbon active particles, thereby effectively buffering the huge amount of non-carbon active particles caused by lithium intercalation. The volume expansion makes it exhibit excellent volume performance as a negative electrode for lithium ion batteries.
Through this research, Professor Yang Quanhong's research team successfully solved the bottleneck problem of high density and porosity of carbon materials, and obtained high-density porous carbon materials.
It is worth pointing out that this "tailor-made" design idea of carbon cage structure based on graphene assembly can be extended to a generalized construction strategy for next-generation high-energy lithium-ion batteries and electrode materials such as lithium-sulfur batteries and lithium-air batteries. The energy storage battery is expected to achieve "small volume" and "high capacity", which greatly meets the needs of users' portability.
