Why do you need graphene smartphone battery?

　　Lei Feng network news, recently, Huawei released a French official of Twitter, notice Huawei will be the first mobile phone equipped with graphene battery brand, and intends to this battery for Huawei's high-end handsets. This Twitter also pointed out that in addition to the battery faster than (the user can be filled within 45 minutes of battery) charging speed than previous models, the battery will be more durable than ever before, more durable and less.
　　Subsequently, the news has been further speculation and foreign media reported. According to Huawei's previous plans, in the first half of 2020, Huawei's flagship product for the P series, therefore, foreign media speculation that P40 will probably be equipped with Huawei's first graphene cell phone.
　　<strong> However, according to the latest news, Huawei executives responded that the Twitter content for false information. </ strong>
　　<strong> Huawei and past graphene battery </ strong>
　　In fact, this is not the first time Huawei and graphene "something to do"
　　in 2015, Huawei Mate8 released on the eve of the new machine on the network using graphite ene battery news spread like wildfire, which makes Huawei released Mate8 concern. However, when the University of Manchester cooperation with Huawei on graphene technology is to focus on the field of communication, rather than graphene battery. Yu ChengDong also mention graphene cells on the conference more than two hours. The final message, "Mate8 equipped graphene battery" were identified as false news.
　　2018 Note10 conference in glory, glory, president of Zhao Ming to introduce several "very scary" technology as well as two eggs, including graphene battery. However, to date, not been for the glory of graphene battery the phone.
　　Huawei said the French official Twitter for dynamic Huawei next year in terms of graphene battery, insiders said that the current graphene battery is committed to addressing three key issues: rate performance, density and energy security, the rate performance that is said fast charge. Right now, the technology has been commercially available mainly in terms of fast charge, if Huawei breakthrough in terms of safety, then, P40 series starting graphene battery is entirely possible.
　　However, this official Twitter now been deleted. Foreign media Phone Arena believes that Huawei delete Twitter news show "may be false news (might be fake news)". <strong> midday today, Vice President of Huawei mobile product line Bruce Lee confirmed this to Twitter false news. </ strong>
　　<strong> What is graphene? </ strong>
　　above been said graphene and graphene battery, where we first look at what is graphene:
Graphene (Graphene): carbon atoms is an sp2 hybrid orbitals honeycomb hexagonal crystal form grid flat film, the thickness of only a two-dimensional material is a carbon atom. In 2004, the University of Manchester physicists Andre Geim and Konstantin Novoselov, successful experiments in isolated graphene from graphite, and confirmed that it can stand alone, it also results "groundbreaking experiments in two-dimensional material graphene" as an excuse, shared the 2010 Nobel Prize in Physics.
Graphene is currently the world's thinnest but most hard nanomaterials, it is almost completely transparent, absorbing only 2.3% of the light; thermal conductivity of up to 5300 W / m · K, higher than the carbon nanotube and diamond, which at room temperature electron mobility rate of more than 15000 cm2 / V · s, than higher carbon nanotube or silicon crystals, only the resistivity of about 10-6 Ω · cm, lower than that of copper or silver, for the smallest earth resistivity material. Because of its low resistivity, electron running fast, they are expected to be used to develop a thinner conductive faster new generation of electronic elements or transistors. (Via Wikipedia)
　　<strong> Briefly, graphene graphene consists of carbon atoms and only one carbon atom-thick hexagonal honeycomb lattice as a flat film (Lei Feng network by: first graphene is with one layer of graphite tape obtained by thinning), having a very good thermal conductivity, electrical conductivity, transparency, and has high strength, ultra-thin, large specific surface area characteristics, and therefore known as "super material". </ strong>
　　With many excellent properties, the use of graphene is also very wide, may be applied to an electrode material of a lithium ion battery, a sensor, a semiconductor device, a thin film transistor prepared composite material, the transparent display aspect of touch screens. The above-mentioned "graphene cell" is one of its main purpose.
　　<strong> Lu Shan true graphene battery </ strong>
　　In recent years, the network news about graphene battery of many and as varied, some media even graphene battery promoted as "lithium batteries subversive revolution." It is not.
　　First of all, we need to understand a concept, <strong> so-called graphene battery cells are not the entire graphene material, but the use of graphene electrode material in the battery. </ strong>
　　Furthermore, graphite is the most commonly used lithium ion battery negative electrode material, when charging, Li embedded graphite intercalation compound layer is formed, when Li is completely embedded, each graphite layer is embedded a layer of Li, corresponding compounds LiC6 , the theoretical specific capacity of 372mAh / g. When the graphene sheets are each arranged in a disorganized manner, at both side surfaces of the graphene can be combined Li, theory doubled, i.e. 744mAh / g specific capacity.
　　<strong> bits due to defects in the graphene, and a microporous structure of the graphene sheet edge can be stored in bulk form Li. That is, in theory, graphene electrode may have more than twice the specific capacity of graphite. </ strong>
　　In addition, if the graphene and SnO2, Mn3O4, CuO and other relatively low conductivity of the positive electrode, a negative electrode composite nanomaterial, such as Li4Ti5O12, TiO2, LiFePO4, etc., may improve the cycle performance of the lithium ion battery . Institute of Metal Research Institute has published in PNAS, the anode material and cathode material LiFePO4 graphene composite Li4Ti5O12, respectively, the LiFePO4- graphene / Li4Ti5O12- graphene as a flexible lithium-ion battery having a high charge-discharge rate of the electrode prepared, graphite lithium ions and electrons alkenyl passage, and acts as a conductive additive and collector.
　　If the additive is added after the lithium batteries as a conductive carbon black and mixing graphene, it might reduce the internal resistance of the battery, improve battery performance and rate charge-discharge cycle life, but has no effect on the bending performance of the battery charge and discharge. And <strong> Huawei, after the high pass through a high current density discharge practice achieving a substantial loss of rapidly charging the battery life, although this shortcoming in recent years has been improved a lot. In contrast, </ strong> <strong> fast battery charging graphene and reduce the battery life will not be like the beauty, but also more technical level. </ strong>
　　<strong> Lei Feng network Summary </ strong>
　　All in all, from the current level of technology and the practical application of graphene technical point of view, a lot of descriptions of graphene currently exists only in theory level, far from immature to you can stage large-scale commercial applications.
　　Solely in terms of the graphene battery, its energy density can theoretically be increased dramatically and even doubled, but so far, graphene battery energy density in practical use is very limited lifting. On the other hand, since the storage material still graphene battery is a lithium ion, the cell is not as graphene network spread as subversion of lithium batteries.
　　Graphene battery, although a breakthrough in improving lithium battery charge and discharge rate and lifetime of lithium batteries, but whether it is the major mobile phone manufacturers, and consumers, should this be sensible attitude.