Porous carbon creates the most efficient electrode in modern battery chemistry, but researchers at Brown University in the United States said the industry finally learned something about it after a bit of pain. They believe that starting with graphene oxide (a combination of carbon, oxygen and hydrogen) and then simply rubbing graphene to produce wrinkles and wrinkles will allow the originally flat graphene sheet to increase its 400% performance To create a higher current density and high efficiency batteries.
Graphene is placed on the shrink sheet to produce wrinkles and wrinkles, which is expected to enhance the properties of graphene (Source: Brown University)
"Multi-generation graphene oxide architectures can be programmed through a specific sequence of mechanical deformations," said Brown University professor Robert Hurt and Ian Wong, as well as postdoctoral researcher Po-Yen Chen and five other researchers in the latest issue of The research is published in Advanced Materials.
According to the researchers, "each new type of deformation results in a gradual enlargement of the characteristic combination of existing smaller patterns to show that they have a 'structural' memory." The results show that these multi-level architectures are superhydrophobic, Excellent for display like an electrochemical electrode. "
"When wrinkled graphene oxide, it can be highly scalable, flexible and will not break," says Wong, "while maintaining good electrical conductivity. Such a function can be used to sense and respond to Externally stimulating, multi-functional wearable devices such as chemical detection. "
Through "programming" and "memory," Brown University researchers believe that wrinkles and wrinkles can be controlled and repeated in a manufacturing environment. In fact, researchers have created a repeatable reference list that shows how to "remember" each desired result by programming a series of wrinkles and creases.
To precisely control wrinkles and wrinkles, Brown University researchers deposited graphene on Shrinky Dinks shrink film - Shrinky Dinks is a polymer that heat shrinks to the expected amount. Then, after dissolving the polymer, graphene is left full of wrinkles and folds. By repeating this process until researchers achieve the desired results in programmed formulations, researchers are able to achieve the same results again and again, opening up a whole new avenue for manufacturers to make better electrodes.
Researchers also tried different configurations, such as trying to clamp one side or the other side of the film before crumpling and wrinkling, and exploring how to control the process in different directions, horizontal or vertical, to produce before wrinkles Parallel crepe and so on. Using what they call "multi-generational" approaches, researchers have created recipe listings that shrink the electrodes 40x closer to their original size.
R & D personnel have published the "taxonomy of structures" directory. Next, researchers plan to try this technology on a variety of different materials.
Various patterns of contraction in different orders produce different types of structures (Source: Brown University)
Other co-authors of the study include Jaskiranjeet Sodhi, Yang Qiu, Thomas Valentin, Ruben Spitz Steinberg, and Zhongying Wang et al.
Compilation: Susan Hong (Reference text: Graphene Boosts Battery Electrodes, by R. Colin Johnson)
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