How far is the application of graphene material technology on energy storage batteries? The answer given by Beijing Carbon Century Technology Co., Ltd. (hereinafter referred to as Carbon Century), which was the earliest in China for graphene technology research and development, is: It is now. On February 21st, Carbon Century held a product launch conference for the graphene lithium ion No. 5 rechargeable battery “Alken Storage King†at the Beijing Automobile Museum, announcing the launch of China's first mass-produced graphene-modified lithium-ion battery.
"Compared with the ordinary No. 5 dry battery and rechargeable battery, this battery has obvious advantages and can be recycled more than 30,000 times. It can be used in the environment of -40 ° C ~ 65 ° C. These properties are beyond the reach of ordinary batteries. What's important is that the battery can be mass-produced, and the product release also represents the official launch of the market." At the press conference, Yan Liqun, chairman of Carbon Century, said.
“Graphene battery†is a concept often used by merchants and the market to stir fry. In fact, according to the “positive-negative active material†naming rules that traditional batteries have been following, the application of graphene materials in batteries cannot be called It is a "graphene battery". However, although the "graphene battery" expression is misleading, industry experts are optimistic about the use of graphene materials in batteries, especially on the electrodes.
"The full name of graphene battery should be graphene-modified lithium-ion battery. There are four methods for battery production. One is used directly in the negative electrode; the other is used as a conductive additive for the positive electrode. All lithium batteries must be coated with conductive additives. It turned out to be conductive carbon black, and now replaces carbon black with graphene, (the two) are relatively low-end." Yan Liqun went on to say: "The third is to directly coat the surface of the lithium battery cathode, because the lithium cathode material is metal. Oxide, long time will lead to oxidation, conductivity is weakened, graphene coverage will solve this problem, improve microscopic conductivity. Fourth, directly as the framework of the electrode material, thereby increasing the strength of the cathode material, while making graphene become The skeleton of the positive electrode improves the life of the lithium battery as a whole, improving microscopic conductivity and battery safety."
The fourth method is used by the "Alken Storage King". “'Alken Storage King' is a graphene-modified lithium titanate negative lithium battery, lithium iron phosphate is used as a positive electrode, and graphene-coated lithium titanate material is used as a battery negative electrode, which greatly improves the electronic conductivity and can be quickly In addition, the graphene-coated lithium titanate and the electrolyte in the battery will greatly reduce the gas production rate, which can effectively improve the high-temperature cycle life of the battery." Yan Liqun said.
The first graphene lithium-ion rechargeable battery is the standard No. 5 battery. When talking about why graphene technology is used to develop and produce such civilian batteries, Yan Liqun said that the 5th battery is widely used in many small appliances, children's toys and digital products. It is a must-have for the family. "You can use it immediately." ".
"Our graphene application products are directly available to the market and mass production." Yan Liqun said: "The starting point of the carbon century is to let graphene materials and their technologies be used for mass production and life as soon as possible."
Yan Liqun also said that compared with ordinary rechargeable batteries (such as nickel-metal hydride batteries), "Alken Storage King" has more excellent performance in terms of operating temperature and charging times. The charging frequency of the normally-charged Ni-MH battery is about 1000 times, and the working temperature is between 0 °C and 40 °C. Under the correct charging and discharging conditions, the charging frequency can be as high as 30,000 times, and the working environment temperature range is also Can be relaxed to -40 ° C ~ 65 ° C. This is also critical: in general, when the battery is outside the range of the working environment, the battery voltage will be too low, which will not meet the electrical requirements of the appliance, which may cause the appliance to be directly shut down or unusable.
Graphene is called "the king of new materials" as a two-dimensional material in which a hexagonal hexagonal shape composed of a carbon atom and a sp2 hybrid orbital is a honeycomb lattice shape and has only one carbon atom thickness. The combination of graphene and other materials can impart nanostructures to other materials, thereby improving the macroscopic properties of materials without changing the original industrial and production equipment, and has extremely broad application prospects.
Carbon Century is a high-tech enterprise specializing in industrial production of graphene and downstream application technology and product development and industrial practice of graphene. At present, it has built the world's first graphene (single-layer carbon atom) tonnage demonstration production line and successfully developed graphite. Ethylene photo-pushing technology, graphene engine oil energy-saving improver, graphene-modified activated carbon for supercapacitors , graphene-modified plastics, graphene air purification products and technologies, graphene surface wave detection technology, etc.
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