Graphene bubbles blow too much.

I'm a battery guy. Try to answer the landlord's question.

First of all, I can't make a conclusion that graphene is used in other directions. In the field of battery, especially in the direction of lithium battery, being a "graphene battery" basically belongs to bullshit (in this case, it doesn't include new batteries such as super capacitors and lithium sulfur, which may be more optimistic).

First of all, I want to ask, what is graphene battery? In fact, up to now, there is no strict definition, right? Unlike lithium-ion, at least you have wikibaidu. This thing, to put it bluntly, is to add some graphene into the traditional battery. OK, better. Change all the materials of one electrode into graphene (but the price of one gram is thousands of yuan, and finally make it into a ratio of battery cost, would you buy it). In a word, 99.99% of the graphene batteries almost add graphene to the traditional lithium-ion batteries, and then they do it. Therefore, there is basically no graphene battery, only "lithium-ion battery / lead-acid battery with graphene".

Of course, there are also a few true / all graphene batteries / capacitors in a few scientific researches, but the requirements for the surface oxidation state of graphene are too high, not to mention the high scary cost of all graphene. You think batteries are expensive every day. This thing is really good. Can you use it? However, in consideration of this, a link to the all graphene battery can also be offered. If you are interested, you can do your own research:

All-graphene-battery: bridging the gap between supercapacitors and lithium ion batteries : Scientific Reports : Nature Publishing Group

So in a word, we are still talking about the future of graphene in lithium-ion batteries.

1. First of all, let's talk about the cost, although the landlord also said that the cost should not be considered first. In the application of lithium battery, graphene mainly plays a role, one is conductive agent, the other is possible to be used as electrode materials. In fact, both of them are competing with the traditional conductive carbon / graphite.

A. so the question is, do you know how cheap these two things are? All of them are sold in tons. When will graphene sold in grams come down to this price? Now all kinds of materials used for lithium batteries are tens of thousands of things per ton, and they are under the pressure of price reduction every day. It is totally unrealistic to use graphene.

B. the specific surface area of graphene and graphene is so large. There are a lot of problems about dispersion. The battery factory adjustment process is not dead. Who would like to use this technology? Graphene surface properties are greatly affected by chemical state. There are many problems in batch stability, cycle life and so on. How to meet the detailed requirements of lithium battery production?

C. even if the above problems are solved, the capacity of graphene as the negative electrode is at most twice that of graphite in theory. For the first time, the efficiency is terrible, and the performance is greatly affected by the surface state. You give me a reason to use it without silicon. The theoretical capacity of silicon is nearly 10 times that of graphite, and graphene is just as cheap as other people... (in the past two years, major battery factories have been opened, and Panasonic's 4ah18650 has been put into use). If you find out which big battery factory (Note: big) uses graphene as lithium battery, let me know.

D. for conducting agent, if the dispersion is not good, it's useless. And the carbon family has a lot of good and cheap materials. Why do you have to use expensive graphene. I also heard that the state of a large piece of graphene paper would block the lithium ion diffusion channel. This is not what I said, but what the person in charge of this area in Ningbo said.

2. Therefore, there is basically no problem of compatibility between graphene battery and traditional equipment, because the lithium-ion / lead-acid battery originally mixed with graphene has no substitution problem, because this technology is not reliable at all.

Seriously, you can search the U.S. patents of Samsung, Panasonic, LG and other enterprises. Among them, there are many graphene patents, but most of them are in the flexible device semiconductor display screen, and the battery only accounts for a few. Take a closer look. Graphene only appears three or four times in most patents. Do you know what it means? That is to say, something can be added to it, just mentioned, mentioned. Panasonic's patents in this area are even less pitiful.

Battery, Panasonic is a benchmark. In other people's patents, we can't say that there are no such contents, but there are not many. If you are interested, you can search the website of the U.S. patent office. I believe that the capacity of Panasonic 18650 battery is a little higher than 3.2-3.5-3.7-4.0ah, and I can't believe that this kind of "breakthrough" with more than 100% movement. Who is doing the work steadily, people are doing it, and the sky is watching.

You may see the news that XX battery is full in half a minute every day. I want to say that it's easy to make a fast charging small battery in the laboratory, but there are many problems that need to be solved in order to get it out of the laboratory and industrialize. Maybe a dozen people and dozens of people are busy for a year, just adjusting one. Note that it's only one parameter or performance. If it succeeds, Amitabha, there are still many failures. As for fast charging, for things like cars, the half-hour fast charging of Tesla is very limited. Don't pursue high current, it's not safe. Besides, the fast charging of thousands of batteries for cars and one battery for mobile phones is not a matter of magnitude and cannot be discussed together.

In addition, what about the graphene battery that Spain's graphenano and Cordoba cooperated with?

"1) the storage capacity is three times the best product in the market at present. The specific energy of a lithium battery (whichever is the most advanced) is 180wh / kg, while that of a graphene battery is more than 600wh / kg. 2) the electric vehicle powered by this battery can run for up to 1000 kilometers, and its charging time is less than 8 minutes. 3) long service life. Its service life is four times that of traditional hydrogenated battery and twice that of lithium battery. 4) light weight. The properties of graphene make the weight of the battery can be reduced to half of the traditional battery, which can improve the efficiency of the machine loading the battery 5) low cost. The company that makes the battery says it will cost 77% less than lithium batteries. "

So, if this battery is really so good, why don't we use Mao model s? Why not Mao Nissan LEAF? Why didn't Qin and Tang use BYD? Why not Prius? Why not volt?

It's no use claiming. I can also claim that I married Gao Yuanyuan, the richest man in the world. Do you believe that.... This information is useless. Most of the news about the improvement of battery performance is not credible. I don't know where to start, because the slot is full. As for their cooperation with German automobile enterprises...

You can't find any meaningful information anyway. Considering the strict requirements and relatively conservative attitude of general automobile enterprises to the reliability of new technology, I think this information is basically untrustworthy, at most, it is just a sample for others.

Conclusion: for many things, most people prefer false hope to cruel truth. I never refuse imagination, which is also an important driving force to promote the progress of human society. But you can't expect this thing to be omnipotent, which can promote the development of an industry. Otherwise, you can make a battery for me with mutual x-net thinking? The development of battery technology is really slow, which requires us all to do things well together, rather than pointing to the gimmicks flying all over the world every day to solve the problems in life. Take a look at the craftsmanship of Japanese batteries, which is always worth learning.

PS: I only expressed my view on graphene battery, and did not evaluate the application prospect of graphene in other fields. In fact, I think graphene may have a bright future in new flexible batteries, devices, displays and catalysts. But in terms of battery, it's not good. Uh huh.