Why do your smartphones need graphene batteries?

In a recent tweet, Huawei’s French official announced that Huawei would be the first mobile phone brand to be equipped with graphene batteries and intended to use it in Huawei’s high-end phones, Lei reported. The Twitter feed also notes that in addition to charging faster than previous models , which users can charge up in 45 minutes, the battery will be more durable,  and smaller than before.

Why do your smartphones need graphene batteries?

Although the image above is written in French, it can still be seen from the words “graphene” “batterie” and so on, it is related to graphene batteries

Subsequently, the news was further guessed and reported bymedia. Under Huawei’s previous plan, Huawei’s flagship product in the first half of 2020 is the P-Series, somedia speculated that the P40 could be Huawei’s first phone with graphene batteries.

However, according to the latest news, Huawei executives responded to the Twitter feed as fake news.

Huawei and Graphene Battery

In fact, this isn’t the first time Huawei has been “involved” with graphene.

On the eve of Huawei Mate8’s launch in 2015, news of the new machine’s use of graphene batteries on the web went viral, which also brought the launch of Huawei Mate8 to the fore. At the time, however, Huawei’s collaboration with the University of Manchester on graphene technology was focused on communications, not graphene batteries. Yu Chengdong also made no mention of graphene batteries at a press conference of more than two hours. In the end, the news that Mate8 was powered by graphene batteries was found to be fake news.

At the 2018 Glory Note10 launch, Glory President Zhao Ming introduced several “scary” technologies and two eggs, including graphene batteries. So far, however, graphene batteries have not been used to glorify phones.

Why do your smartphones need graphene batteries?

 The image above is a graphene electrode battery characteristic curve, pictured from the application of graphene in mobile phones written by Nokia Research Center PDF file

In response to Huawei’s official Twitter account of Huawei’s developments in graphene batteries next year, industry insiders say the current graphene battery is working on three key issues: multiplier performance, energy density and safety, which is called fast charge. For now, the technology that is already commercial is mainly in fast charging, and if Huawei makes a breakthrough in safety, the P40 series debutgraphene battery is entirely possible.

However, the tweet has now been officially deleted. Media outlet Phone Arena said Huawei’s removal of Twitter suggested the news “could be fake news.” At noon today, Bruce Lee, vice president of Huawei’s mobile product line, confirmed the Twitter news as fake news.

What is graphene?

As we’ve been talking about graphene and graphene batteries, here’s what graphene is:

Graphene: A two-dimensional film consisting of carbon atoms forming hexagonal hive lattices in a sp2 hybrid orbit, with only one carbon atom thickness. In 2004, physicists Andrei Haim and Konstantin Novoselov of the University of Manchester in the United Kingdom successfully isolated graphene from graphite in experiments, which proved to exist alone, and the two won the 2010 Nobel Prize in Physics for “groundbreaking experiments in two-dimensional graphene materials”.

Graphene is currently the thinnest but the hardest nanomaterial in the world, and it is almost completely transparent, absorbing only 2.3% of the light; K, higher than carbon nanotubes and diamonds, at room temperature, its electron migration rate of more than 15000 cm2/V.s, and higher than nanotubes or silicon crystals, and resistivity of only about 10-6 s cm, lower than copper or silver, is currently the world’s least resistivity material. Because of its extremely low resistivity and the speed at which electrons run, it is expected to be used to develop a thiner, faster-conducting new generation of electronic components or transistors. (Via Wikipedia)

Why do your smartphones need graphene batteries?

 The image above is an IBM graphene chip

Simply put, graphene is a single layer of graphite made up of carbon atoms, is a hexagonal type of honeycomb lattice of a flat film with only one carbon atom thickness (Ray Feng net press: the earliest graphene is to use tape layer by layer to thin the graphite to obtain), with very good thermal conductivity, conductivity, light transmission, and has a high strength, ultra-thin, The super-large ratio of surface area and other characteristics, and thus known as the “super material.”

With its excellent properties in many aspects, graphene is also widely used and can be used in lithium-ion battery electrode materials, thin-film transistors, sensors, semiconductor devices, composite material preparation, transparent display touch screen and so on. The graphene battery mentioned above is one of its main uses.

The true face of the Lushan of graphene batteries

In recent years, the network about graphene batteries, the news is many and mixed, some media even called graphene batteries as “the lithium battery’s subversive revolution.” This is not the case.

First of all, we need to understand a concept, so-called graphene batteries are not the entire battery is made of graphene material, but the electrode of the battery using graphene material.

In addition, graphite is the most commonly used negative material in lithium-ion batteries, when charging, Li is embedded into the graphite layer to form an interlayer compound, Li is fully embedded, each graphite layer is embedded in a layer of Li, the corresponding compound LiC6, the theoretical ratio of capacity of 372mAh/g. When each single layer of graphite is arranged in a messy manner, Li can be combined on both sides of the single-layer graphite, which is theoretically doubled in capacity, i.e. 744mAh/g.

Li can be stored due to the defect slate of graphene, the edge of the sheet layer, and the microporous structure formed by graphene accumulation. In other words, in theory graphene electrodes may have more than twice the ratio capacity of graphite.

Why do your smartphones need graphene batteries?

 The image above is a composite electrode material structure

In addition, if graphene and SnO2, Mn3O4, CuO and other positive and negative nanomaterials with low conductivity are composited, such as Li4Ti5O12, TiO2, LiFePO4, etc., may improve the circulation performance of lithium-ion batteries. The Institute of Metals of the Chinese Academy of Sciences has published a paper in PNAS, combining the positive material LiFePO4 and the anegative material Li4Ti5O12 with graphene, and preparing LiFePO4-graphene/ Li4Ti5O12-graphene as an electrode with a high charge and discharge of flexible lithium-ion batteries, graphene as a path to lithium ions and electrons, while acting as a conductive additive and collecting fluid.

If graphene and carbon black are mixed as conductive additives to add to the lithium battery, it may be possible to effectively reduce the internal resistance of the battery, improve the battery multiplecharge charge and discharge performance and cycle life, and the battery bend ingenuity has no effect on charge and discharge performance. Huawei and Qualcomm’s previous practice of charging quickly with charge and discharge at high current density has been a significant loss of battery life, although this shortcoming has improved considerably in recent years. By contrast, the fast charging of graphene batteries is less technical than cutting battery life.

 Summary

All in all, from the practical application of graphene technology and the technical level, many descriptions of graphene are still only theoretical, far from mature enough to be used in large-scale commercial applications.

From the point of view of graphene batteries alone, their energy density can theoretically be significantly increased or even doubled, but so far, graphene batteries have very limited energy density in practical applications. On the other hand, because the energy storage material in graphene batteries is still lithium-ion, graphene batteries are not the same as the internet spread is the reversal of lithium batteries.

Although graphene batteries have a breakthrough in improving the charge and discharge rate of lithium batteries and the life of lithium batteries, both major mobile phone manufacturers and consumers should maintain a rational attitude towards this.

Add a Comment

Your email address will not be published. Required fields are marked *