Why isn‘t huawei‘s graphene battery disruptive to battery technology

　　Graphene used in lithium ion battery, super capacitor, lithium sulfur batteries, fuel cells to solar cells, we see it is undeniable that there is a technical breakthrough has, why still can‘t see the practical commodity on the market so far?

　　

　　Arguably, graphene is currently the world‘s most thin is also one of the hardest nanomaterials, room temperature the electron mobility, more than 15000 cm2 / Vs, and higher than carbon nanotubes or silicon crystal, and the resistivity of only 10 8 Ω e - m, are lower than those of copper or silver, the resistivity of the smallest materials in the world, the application of their excellent properties should be as?

　　

　　Why isn‘t huawei‘s graphene battery disruptive to battery technology

　　

　　I‘m sorry, but that‘s not the case. Before we can answer the question of how we can make energy products go public before they can be released, I will try to clarify some of the misconceptions about the use of graphene in energy.

　　

　　First, does the graphene battery charge 10 minutes to run 1, 000 km? Not yet.

　　

　　Second, there are only two areas where graphene is most likely to work in lithium-ion batteries: directly used for negative materials and for conducting additives

　　

　　Third, what are the most likely features of graphene in ultracapacitors?

　　

　　Large surface area, which helps to produce high energy density.

　　

　　High conductivity, which helps to maintain high power density;

　　

　　The chemical structure is beneficial to the introduction of pseudocapacitors to increase the energy density.

　　

　　Special electronic structure can optimize structure and performance.

　　

　　Fourth, the theoretical calculation shows that if the monolayer graphene, the H2 adsorption capacity can reach 7.7 wt %, can fully meet the United States department of energy (MOE) the requirements of the hydrogen required about cars (6 wt %).

　　

　　Fifth, the graphene supercapacitors of the medium car do not exceed the current level of technology. The average 18650 battery capacity is about 3, 100mah, which is estimated to be about 700 wh/L, and the supercapacitors don‘t have the chance to replace the lithium battery in 200kw/kg.

　　

　　Sixth, there is no "graphene battery"? The so-called graphene battery is not the whole battery made of graphene materials, but in the battery electrode materials used graphene, so called "graphene battery" is not appropriate.

　　

　　In not into the topic for graphene is applied to all kinds of energy products before, we first review China in graphene lithium battery "old news" ~ 2015 listing of the mobile phone called the blazers alpha, is adopted by chongqing wisdom green technology research institute, Chinese academy of sciences and Chinese academy of sciences, ningbo institute of material technology and engineering development of graphene touch screen, batteries and new materials such as thermal conductivity of membrane, mobile phone touch screen not partial color not yellow, real, pure color, permeability is better than traditional screen, mobile phone recharge rate increased by 40%, extended battery life by 50%, the energy density of the battery increases 10%.

　　

　　Can be seen from this that electrodes using graphene materials while greatly improves the life span of the battery and battery charging speed, but because of material itself has the properties such as high specific surface area of graphene, and now the lithium ion battery industry technical system is not compatible, the energy density did not realize the theoretical doubled, only increased by 10%.

　　

　　Indeed, the current claim that graphene battery ╱ capacitance can raise more than 30% of the capacity information credibility is very low, because the reaction mechanism for nothing, no specific data, 3 without the product the measured results of the analysis. But we can only see that the energy density can‘t double, and it‘s too arbitrary to assert that it is "incompatibilities" with the existing technology system than the surface area. Really is to blame for the back in front of me, according to an article also protect the method of graphene oxide materials only 2 3 kinds, but we already have more than 200 kinds of portfolio includes: pore type powder and flake type powder, MAO will use what way to improve the lithium battery? Remember, the lithium-ion battery is a "system" solution that can‘t be disassembled from a single unit.

　　

　　I‘m still optimistic that supercapacitors will replace lithium-ion batteries, but who knows? We are to increase the energy density of super capacitor to close to lithium ion batteries, but lithium ion battery industry is not built overnight, the performance of ascension has its positive significance.

　　

　　In the last six months, experts have cited several reasons why graphene applications have become difficult to apply to lithium-ion battery applications, including:

　　

　　A, cost problem. Traditional conductive carbon black and graphite are sold in tons (tens of thousands of yuan). The material used at this time is graphite microchips (probably dozens of layers), not single or several layers of graphene.

　　

　　B, the process characteristics are not compatible. It is that graphene is bigger than surface area, and it will bring a lot of technological problems to the process of dispersing the existing lithium ion batteries.

　　

　　C, if graphene is the most negative in theory, it is twice the capacity of the graphite cathode (720mAh/g), why not use silicon?

　　

　　D, graphene is can do conductive agent to promote quick charge, in theory can improve the performance of ratio and graphene if it launched with the electrode active material composition, can jam lithium ion diffusion channel.

　　

　　Graphene does not exist alone, it must appear in the form of composite materials, even in positive, negative and diaphragm.

　　

　　I often say that "sitting is not as good as it is", and here is my view of graphene in energy:

　　

　　First, graphene as important new material, in the smart phone, the new display, lithium ion battery, solar photovoltaic and other more important application prospect in the field of electronic information industry, the current graphene materials is still in the early industrialization application, the large-scale application in these areas still need to carry out a lot of work.

　　

　　Second, graphene material in the mass application of a new generation of information technology industry, should be closely integrated with the downstream demand, pay attention to the materials research and development, product design, the preparation technology of overall planning, build industry new ecological pattern, create demand for traction, synchronous development, tight coupling mode of industrial development, promote the graphene materials in the field of a new generation of energy technology application as soon as possible.