Abstract Graphene is headlined again. On December 18, Xinhua News Agency issued a statement saying that "Chinese scientists have developed a graphene 'super battery" that charges for 35 seconds and lasts for 35 kilometers. The relevant research results have been published in "Science...
Graphene is on the headline again. On December 18, Xinhua News Agency issued a statement saying that "Chinese scientists have developed a graphene 'super battery" that charges for 35 seconds and has a life of 35 kilometers. The relevant research results have been published in "Science", and this news broke the circle of friends in an instant. . Here, I would like to praise the scientific research results obtained by Chinese scientists. However, after the hard work of worshipping the original text, Xiao Bian believes that the research results themselves are worthy of praise, but this report has many loopholes. The materials mentioned in the study are not graphene, and the research results should be supercapacitors, which have little to do with “super-batteryâ€, let alone “can be widely used in battery replacementâ€. Such controversial reports have forced people to suspect that this is another hype. Let’s first take a look at why Xiao Bian thinks this report is another graphene speculation, or at least a misleading report:
The report was written at the beginning:
"On the 18th, the reporter learned from the Shanghai Institute of Ceramics of the Chinese Academy of Sciences that the scientists have developed a high-performance supercapacitor electrode material - nitrogen-doped ordered mesoporous graphene. This material has excellent electrochemical energy storage. Features, can be used as a "super battery" for electric vehicles: charging takes only 7 seconds, and can last 35 kilometers. The relevant research results were published on the 18th in the world's top journal Science.
After reading it, as a non-professional reader, I remembered two things: "One material----special graphene" and "Super-battery battery that charges for 35 seconds and lasts for 35 kilometers." But after reading the original research paper published in "Science", I read this report and found that there are too many problems.
In the report of the problem, the research result is "nitrogen-doped ordered mesoporous graphene", which is actually a mesoporous carbon, not graphene.
“The scientists have developed a high-performance supercapacitor electrode material – nitrogen-doped ordered mesoporous graphene. This material has excellent electrochemical energy storage propertiesâ€
Nitrogen-added graphene material! Chinese scientists have made breakthroughs in graphene research! I believe that most readers have similar ideas to Xiaobian.
However, after reading the original text, it will be found that the material used in the abstract is nitrogen-doped ordered mesoporous few-layer carbon, nitrogen-doped ordered mesoporous carbon (OMFLC-N). Hey, this does not seem to be graphene? After all, you can't simply equate carbon and graphene. After a detailed calculation, there are a total of 10 graphenes in the paper, but there are 8 graphene-like structures/graphene-like sheets.
Knowing that the last cell in the battery field, which did not want to be named, found another point, it can be proved that the OMC mentioned in the paper is not graphene.
what? This material is not very conductive? That is not the same as the graphene that everyone has been saying is very conductive! It can be seen that this ordered mesoporous carbon (OMFLC) is not graphene.
Question 2 "Supercapacitor" does not mean "super battery". The paper does not say that this is "a super battery that runs 35 kilometers in 7 seconds."
The material has excellent electrochemical energy storage characteristics and can be used as a "super battery" for electric vehicles: it takes only 7 seconds to charge and can last for 35 kilometers.
However, the report was followed by:
“Supercapacitor is an electrochemical energy storage device between traditional capacitors and batteries. It has been widely used in hybrid electric vehicles and high-power output devices due to its high power density, long cycle life, safety and reliability. And so on.... Huang Fuqiang's research team finally found that graphene is the best choice for supercapacitor electrodes."
Is this contradictory? "Supercapacitor" and "super battery" are not the same thing. Xiaobian also made mistakes in confusing supercapacitors and batteries, so I also specifically checked what is a super capacitor.
Supercapacitor: A power supply with special performance between a traditional capacitor and a battery. The outstanding advantages are high power density, short charge and discharge time, long cycle life and wide operating temperature range.
The biggest advantage of supercapacitors is that the power density is high. The image is that the charging is fast, but the speed of no electricity is also fast. However, batteries generally value energy density, which is longer than standby time or cruising range.
From this point of view, the results of this research are obviously not related to the "super battery" that charges 35 kilometers for 7 seconds.
What is the basis for the “widely applicable to the replacement of batteries†in the third report? Anyway, there is no research paper.
In addition to the excellent performance of “charging 7 seconds for 35 secondsâ€, the report also mentioned “can be widely used in battery replacementâ€:
According to reports, the new graphene supercapacitor is light in weight, non-flammable and non-explosive, and can be produced at a low cost to achieve scale production. Because of its performance, it has obvious competitive advantages over batteries such as lead-acid and nickel-hydrogen, and it is rapidly charging and discharging. The aspect is far superior to lithium batteries, so the "super battery" can be widely used in the upgrading of existing hybrid electric vehicles and high-power output devices."
Although the description of the performance comparison between different types of batteries is consistent with the paper, the conclusions are not given in the research paper. Anonymous knows that the battery big coffee said that the report has described the material as "running 35 kilometers in 7 seconds", but the author of the paper is not like this in his own work, and in response to this passage in the original text:
At this point, it has been basically confirmed that the report on the study of graphene super-strong batteries is inaccurate. Chinese scientists have developed supercapacitors using ordered mesoporous carbon (OMC), which has nothing to do with graphene. Although there is a breakthrough in energy density, it is far from being able to become a replacement for the battery industry.
In recent years, graphene research has continued to produce headlines. But the speculation of graphene batteries and the fact that the truth is unknown but suspected of speculation are also endless. Xiaobian wants to say that paying attention to the development of graphene is a good thing, but always relying on the name of graphene to sizzle will only consume the public's attention to graphene, restrict the development of graphene, and also for those who are really in graphene research. Disrespectful scholars and companies do not respect.
The development of graphene industry has a long way to go
On the topic of graphene, the point that can't be avoided is how to transform the research results in the laboratory into technologies and products that can be both economical and industrialized.
The president of the graphene application company Taiwan Zhiyang Technology, said:
The technology published by the academic community in Science usually takes more than 10 years to be commercialized. A small sample can be added to this point to achieve the goal, but the industrial product requirements are consistent.
Zhu Hongwei, a professor at the Micro-Nano Mechanics Center of Tsinghua University's School of Materials, told Caixin reporters.
At present, domestic graphene applications, some are indeed in the concept of speculation, there are actually few companies that do graphene, many of which are originally made of carbon materials such as graphite, or even completely unrelated companies under the banner of graphene, or There are only a handful of companies that speculate on stocks, or fight for state funds, to make graphene and make money. Non-graphene is not a truly valuable application, and it is still in the laboratory at this stage.
In addition to the disconnect between research and application, whether the graphene industry has been formed is still a problem.
Dr. Yu Yu from the Industrial Research Department of Silver-Based Carbon New Materials Co., Ltd. also said at the event:
China is still unable to talk about the development of the graphene industry at this stage. The industry includes a series of links from raw material preparation, application product manufacturing and sales. However, many companies are still studying how to realize low-cost industrial production of graphene materials. Can't talk about the application.
However, it is undeniable that the “universal material†graphene has great potential for development and development. The Ministry of Industry and Information Technology, the National Development and Reform Commission and the Ministry of Science and Technology have just released "Several Opinions on Accelerating the Innovation and Development of Graphene Industry", and proposed to form a complete graphene industrial system in 2020 to achieve standardization, serialization and low cost of graphene materials. Large-scale applications in energy equipment, transportation, aerospace, and offshore equipment.
Zhou Changyi, Director of the Materials Industry Department of the Ministry of Information Technology, also stated at the 2015 China International Graphene Innovation Conference that the 13th Five-Year Plan for the development of new materials including graphene is being prepared and will be introduced soon. For the problems of weak conversion of technology and narrow application of commercial applications in the production and application of graphene, the Ministry of Industry and Information Technology will be guided by the problems encountered in market development, and will help enterprises to build a sound industrial chain by striving for the demand of end products. Graphene has become a leading industry in the development of new materials industry.
With state support and a large number of enthusiastic researchers on graphene applications, Xiaobian believes that the development of graphene will be very good and rapid.
Modern bedroom layout advocates simplicity, multi-functional furniture has become more and more the public 's choice, in order to meet the occasional visitors' living needs, a multi-function Sofa Bed is very necessary. Usually, multifunctional Sofa bed can be placed in the sitting room or study, act as a seat function; the guest comes in the evening, spread multifunctional sofa bed, spread bedding is a sleeping bed. Multi-functional sand is not only used for home life, in the current room, meeting room, lounge, multi-functional sofa bed are also useful. In the fatigue, shift interval, overtime after the working pay groups, let go of the multi-functional sofa bed to take a rest. Multi-functional sofa bed can also choose leather fabric, so that you can save space at the same time, but also bring users and visitors solemn, capable, dignified feeling, so more suitable for business talks, daily negotiations and other business activities. The sofa metal frame structure replaces the traditional fixed frame structure, which is generally commonly known as the iron frame. The iron frame can be moved according to the design angle and displacement, so as to realize the overall posture of the sofa from sitting posture to lying posture. There are a variety of holes on the iron frame to fix the sofa wooden frame.
Multifunctional Sofa Bunk Bed,Multifunctional Foldable Sofa Bed,Multi Function Sofa Bed,Multifunctional Folding Sofa
FOSHAN CITY LESHUN RONGHUI FURNITURE CO.LTD , https://www.ronghuifurniture.com