Finding a place, stopping, plugging in and charging this operation may become history right away. In general, it takes at least 2 hours to fully charge an iPhone, but the emergence of the new nanomaterial MXene can change the unit of charge time of the phone from hours to seconds. Scientists invented the new nano material MXene, which can reduce the charging time from several hours to several seconds. This invention will not only shorten the charging time of mobile phones but also be used for electric vehicles. This will solve a major problem affecting the development of electric vehicles.

Previous studies have demonstrated the application of ultracapacitors as energy storage devices for portable electronic devices. Supercapacitors release energy in the form of explosions and have amazing potential energy in powering our technology.

The problem is that they can only be used for fast charge/discharge cycles, rather than long-term energy storage.

Recently, a research group from Drexel University used a material called MXene that combines the fast charging performance of supercapacitors with the long-term energy storage performance of conventional batteries.

Yury Gogotsi, a researcher at Drexel University Engineering and principal researcher of the group, said that their findings refute the widely accepted dogma that chemical charge storage (such as the way previously used in batteries) is always better than physical charge storage ( That is, the super capacitor) is much slower.


MXene material

“We demonstrated the charging process of thin MXene electrodes in tens of milliseconds. The extremely high conductivity of MXene paves the way for the development of ultra-fast energy storage devices. He can charge and discharge in seconds. , but much more energy is stored than traditional supercapacitors."

MXene is a flat nano material that looks like a sandwich: two layers of oxide are like bread, filled with conductive carbon and metal. When they are manufactured, the MXene layer can be stacked like a multilayer potato chip.

Although MXene has good conductivity, this stacked potato structure creates an electrical ion barrier that prevents the diffusion of ions in the cell.

The battery wants to store the charge, where the "redox active site" must be stored to store the ions. The more these sites are, the more energy the battery can store. More importantly, the battery must also allow ions to move freely, otherwise they cannot reach these sites.

To allow free movement of ions in MXene, scientists changed the structure of MXene and combined it with a hydrogel to transform the MXene's stack hierarchy into a more cheese-like structure with holes allowing free flow of ions.

"In traditional batteries and supercapacitors, ions have a curved path to the charge storage ports, which not only slows down all reactions, but also allows very few ions to reach the redox reaction destination at fast charge rates. "One of the team members, Maria Lukatskaya said.

“The ideal electrode structure is that ions like ions can move through multiple channels to redox sites instead of single channels. Our large-pore electrode design achieves this goal, allowing fast charging in seconds or less. May happen."

It should be noted that although this work currently looks promising, it is unclear how the battery will be used in vehicles. There is no doubt that this research will eventually be applied to cars and mobile phones. It will completely change the way the battery is used.

Gogotsi said: “If we use low-dimensional and electronically conductive materials as battery electrodes from the beginning, we can make more efficient batteries.” Ultimately, the knowledge of this conductive structure will make our cars, laptops and cell phones Can charge at higher speeds - from several hours to minutes or even seconds. This study has been published in "Natural Energy".

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