Several technical problems of graphene battery -Lithium - Ion Battery Equipment

Several technical problems of graphene battery -Lithium - Ion Battery Equipment

On November 26, before the launch of a Huawei mobile phone, it was reported that the phone used graphene batteries. Affected by this, graphene concept stocks led the market higher on the same day.

Although Huawei later confirmed that mobile phones did not use graphene batteries, there is still huge room for imagination about graphene batteries in the capital market. However, many scholars believe that it is difficult to break through various technologies at present. The real graphene is still a product in the laboratory, and the actual production is still far away.

Liu Guanwei, senior engineer of Beijing General Institute of Nonferrous Metals Research and doctor of Tsinghua University, said in an interview that there were differences on how to mean graphene batteries at first: adding graphene materials to electrode materials meant that graphene batteries were misleading. The news about graphene battery is limited to some superficial reports. There is not even a schematic diagram of the structure and reaction mechanism of the battery, nor specific technical parameters such as energy density, voltage, cycle life, etc. As for the battery industry, without such information, the reported news lacks the most basic credibility, and there is a great possibility of false exaggeration.(Lithium - Ion Battery Equipment)

Graphene battery is not worthy of its name

In view of the possible outstanding properties of graphene, the news about the application of graphene has always attracted attention in recent years. Among them, graphene battery is the most popular one. However, it is difficult to get the recognition of industry insiders. Liu Guanwei believes that graphene can be used as a conductive agent to promote the rapid charging and discharging of lithium batteries, which can theoretically improve the magnification performance. However, if the dispersion process is not in place and the mixture is uneven, everything is a castle in the air. The high cost of graphene and the incompatibility of the process characteristics in lithium batteries make the technology of graphene batteries close to non-existent, and its gimmick significance is far greater than practical value.

Li Yongfeng, a professor at China University of Petroleum, is also skeptical. He believes that the current application of graphene in batteries is to replace the original graphite by combining it with silicon in the negative electrode of the battery, which can improve the overall capacity and charging speed of the battery, but the performance improvement effect is limited, and the online rumors of subversive improvement are not very realistic. In addition, some insiders mentioned that the surface characteristics of graphene are greatly affected by the chemical state, and the batch stability, cycle life and other issues are also difficult to meet the detailed requirements of lithium battery production.

Previously, it was reported on the Internet that BYD was also studying the application of graphene in lithium batteries, but the reporter learned from the relevant person in charge of BYD that the battery of BYD still uses lithium iron manganese phosphate and does not use graphene.

Although many insiders believe that the so-called graphene battery is just speculation at present, according to Zhu Hongwei, a professor at the School of Materials of Tsinghua University, it is too absolute to say that technology does not exist at all. With the maturity of technology and technology, it is possible to improve the performance of the battery through graphene in the future.

High-end technology is still in the laboratory

In fact, not only graphene batteries, but also many high-quality properties and products of graphene are difficult to display outside the laboratory at present, and the mass production of related products is far away.

Conceptually, graphene is a two-dimensional material with only one carbon atom thickness, which means that the real graphene is a single layer with only one atom thickness, which is the thinnest material known at present. It is in the single-layer condition that graphene has multiple surprising properties. For example, at the nanometer level, its strength is 20 times that of steel, but it also has the flexibility of 20% tensile non-fracture; It is almost completely transparent, absorbing only 2.3% of the light; The thermal conductivity is up to 5300W/mK, higher than that of carbon nanotubes and diamond, and its electron mobility is more than 15000cm2/Vs at room temperature. These excellent properties are believed to be the reason why graphene can overturn many industries.



Contact Us

24 hours online service