Why did graphene become a scam in China?
May,25,20
But while graphene's prospects are increasingly promising, there is a very different argument: graphene is a hoax in China. In March 2015, Chongqing Green Intelligent Technology Research Institute of Chinese Academy of Sciences announced the launch of a graphene mobile phone called "Yingchi setter α". According to the publicity at that time, its light transmittance was as high as 97%, the charging rate of the mobile phone was increased by 40%, the battery life was extended by 50%, and the energy density of the battery was also increased by 10%. Because with graphene, although the phone is only equivalent to a thousand yuan configuration, the price can also be as high as 2499 yuan. Eight months on, the graphene phone has not been on the market, despite the announcement of the first 30000. But people can buy other kinds of graphene products. For example, the new third board listed company Shengquan group has launched graphene socks and underwear in the market. According to the company's publicity, they added the biomass graphene "internal heating" fiber to their products, which is a new intelligent multi-functional composite fiber, "with the characteristics of activating immune cells, protecting ultraviolet rays, improving microcirculation, antibacterial, warming and increasing Yang, and deodorizing". According to the company's publicity, they carbonized plant straw to extract graphene, using the superconductivity of graphene as the raw material for clothing production. They also plan to launch smart bras, measure the subtle changes in women's chest temperature through built-in sensors, effectively prevent tumors and breast cancer, and plan to apply them to military uniforms - at present, these so-called graphene products are not cheap, the price of a pair of socks is more than 50 yuan, the price of a pair of underpants is close to 300 yuan, the price of a graphene belt is nearly 600 yuan, while the price of a hot suit It's over 1700 yuan. "A few years ago, when nano materials were hot, there was a lot of" nano + "concept hype in China. This time," graphene "is the same. Many graphene products are a deception." Qi Lu, director of the 863 program, a material scientist and professor of the school of chemistry and molecular engineering, Peking University, said. Due to its contribution to new materials and energy, Qilu is also known as the main founder of positive materials for lithium cobalt and lithium manganese batteries in China. According to the reporter, graphene is mainly divided into two kinds: single atom film graphene and graphene powder. The former is mainly prepared from methane, acetylene and other carbon containing gases by chemical vapor deposition, which has nothing to do with graphite or straw. Graphene powder is made of natural graphite, oxidized by concentrated acid and strong oxidant, and then reduced by expansion heat treatment. As for the graphene extracted from straw, it is said that 15 Jin corncob can extract one jin of graphene, which is unheard of by many insiders. In addition to the obvious deception of graphene underpants, the "graphene battery" and "graphene lithium battery" which are developed by many research institutes and enterprises are also accused of lying. At present, the practice of graphene used in battery field is to add graphene material in the positive and negative electrodes of lithium battery. "This is obviously misleading." Recently, Liu Guanwei, a researcher at Tsinghua energy Internet, questioned the online heat transfer of the article "graphene battery". Is this "legendary" graphene battery "technology a big lie? 》In the article, Liu Guanwei gave a clear view at the beginning: The technology of "graphene battery" is close to nonexistence. Graphene can only improve the charge and discharge rate in theory, but it has no help to improve the capacity (energy) (people who expect that "graphene battery" can solve the problem of cell phone / electric vehicle endurance will be disappointed). Its gimmick significance is far greater than practical value. According to the classic electrochemistry nomenclature, the lithium-ion battery used in general smart phones should be named "lithium cobalt graphite battery", Liu said. It is called "lithium-ion battery" because lithium ion plays a major role in it. "In a strict sense, graphene is only used as an auxiliary role in the battery. Therefore, the battery with graphene cannot be directly called a" graphene battery. " According to Liu Guanwei, graphene is the only "conductive additive" that has basically entered the market. But even the application of the "additive" type, there are many doubts. Graphene can be used as a conductive agent to promote the fast charging and discharging of lithium battery, which can improve the rate performance in theory, but if the dispersion process is not in place and the mixture is uneven, everything is a castle in the air; in addition, there are many materials with good quality and low price, so it is not necessary to use expensive graphene. " The reporter noted that Liu Guanwei's view was recognized by many senior experts in the industry, such as Zhang Yuanbo, Qilu, Lu Hongbin, Professor of Polymer Science Department of Fudan University, Yuan Guohui, Professor of Applied Chemistry Department of Harbin University of technology, etc. "Who can come up with the data up to now? Has anyone made such a battery? " Qilu also believes that "the positive and negative electrodes of lithium batteries are layered structures, so under certain external conditions, the migration from the positive electrode to the negative electrode can be formed.". Graphene is a single-layer carbon atom ring structure, which is determined by its own chemical and physical properties. It will not form a separate negative material for lithium battery. " A lot of people are wasting their lives? Li Yichun, as the Secretary General of "China graphene industry technology innovation strategic alliance", said: "although there are disputes in the industry, science and technology innovation, anything can happen
