CAS's super capacitor new materials, really can bring the electric car industry?
Recently, the Xinhua news agency released a let the electric car makers feel excited by the news. The news said: "scientists at the Institute of the Chinese Academy of Sciences Shanghai 200050 successfully developed a high performance super capacitor used for electrode materials of nitrogen doped ordered mesoporous graphene." And said, the material has excellent electrochemical energy storage characteristics, can be used as an electric car 'super battery': charging only 7 seconds, you can run 35 km." It is reported that the relevant research results have been published in the world's top academic journals "science" on 18 days. Sounds like a bad look, but don't get excited about it. There are a few things you might need to know about the new material and application.
Super capacitor can take us to fly?
The so-called super capacitor, according to Xinhua said: "it is between the traditional capacitors and batteries, an electrochemical energy storage device. Due to its high power density, long cycle life, safety and reliability, it has been widely used in many fields, such as hybrid electric vehicles, high power output devices and so on." Wait, since it's so bad? Why electric cars most readily found, mainly uses the battery? For example, Tesla's lithium batteries (most of them), TOYOTA Prius nickel hydrogen batteries, etc.. The reason is that the energy density of the super capacitor is too low. Energy density is low, it means to meet the actual needs of the capacitance will be very large. And as the report said, to find the ideal material, making the super capacitor with high function, high energy, has been the direction of scientists.
According to science on the article shows that this time the research of new materials, in the energy density can reach the lead-acid battery 41wh / kg at the same time functional and good, really is not a small progress. But for practical purposes, Tesla, for example, the Tesla Model s uses is from Panasonic 18650 battery, its energy density is 233wh / kg, and a car Tesla Model s battery and 900kg. Pinch refers to calculate, carrying more than 5000 kilograms of battery runs up, the feeling seems to be still not so good. In fact, now the super capacitor in electric vehicles, are used as the battery's slave, play a supporting role. The second charge of this matter, in fact, fast charge fast, has been a major advantage of the super capacitor, but the problem of energy density can not be resolved, but it sounds very good.
It is worth mentioning that, in the article in science, and can not find a charge only 7 seconds, you can battery life of 35 km, the relevant data, I do not know where this information comes from.
Graphene? Or graphene carbon material?
Xinhua article will Shanghai Institute of ceramics research and development of this new material is known as the "nitrogen doped mesoporous graphitic pore ene". However, in fact, "science" articles and did not say they use is graphene, graphene like dielectric hole nitrogen material may be more appropriate expression.
In fact, in recent years, a lot of similar coverage, what "a new generation of super capacitor for a few minutes full run 500 kilometers, know almost also has many" how to evaluate 'certain R & D out a minute full charge new batteries!' This news?" Every time the relevant research has been out, always news led to the industry related to a burst of excitement, but from the R & D to the actual production and use of the distance how far? Know almost on a student on the new material for the answer or worth thinking. The following excerpt from known almost answer: Liu Guanwei, almost know Id Fu Leiliu, Tsinghua University Institute of Internet innovation energy deputy researcher.
Breakthrough in the performance of the laboratory, but said industrialization is still too early
Editor: Chen Xin
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