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Guo Shouwu (right) and the researchers are doing experiments all night.
“Charging for 5 minutes, talking for 2 hoursâ€, “Getting on the go with ease, and easy travelâ€... With the accelerating pace of life, people are starting to demand more time for secondary charging and expect to maximize the benefits within a limited time. As a result, the scientific research community and the industrial community have been working hard to quickly and quickly discharge lithium ion batteries.
In recent years, China has begun to vigorously develop related industries such as power batteries and shared transportation. China's power-related lithium-ion battery-related industries have also developed rapidly, and quick-charge and rapid-discharge secondary batteries have become familiar to everyone.
Through nearly a decade of research, the team of Shanghai Jiaotong University’s Guo Shouwu has overcome a number of scientific and technological difficulties, and at the 2017 Industrial Fair, it launched the newly developed “new type graphene and graphene-based lithium-ion battery†as a “quick The new energy revolution of "Enrichment" has laid a solid foundation.
Black Gold Technology: Use graphene to power up the battery
Technological innovation has never stopped, and the advent of graphene technology has opened up a new era of “fast-charge and fast-discharge lithium ion batteriesâ€. As one of the newest nanomaterials found to be the thinnest, most strength, and the best conductive and thermal conductivity, graphene is called “black gold†and “king of new materialsâ€. As a new low-dimensional carbon material, graphene can improve the conductivity of the corresponding electrode material by virtue of its excellent electrical conductivity, thereby improving its charge and discharge and cycle performance; at the same time, the graphene "flexible" three-dimensional network structure can be It effectively suppresses expansion, pulverization, and coalescence of the material caused by volume changes during charge and discharge of the electrode material, and enhances conductive contact with the current collector and the electrolyte. Therefore, graphene can improve the electrochemical performance of the positive and negative electrode materials of the lithium battery, thereby greatly improving the large current charge and discharge performance, cycle stability, and safety of the lithium battery.
"In the charge-discharge cycle of lithium-ion batteries, in order to maintain the charge balance, the electron migration must be accompanied by the insertion or extraction of Li+. If the electrons cannot be introduced or exported in time, the enriched electrons will in turn restrict the insertion of Li+ by the polarization effect. The release of the material deteriorates the electrochemical performance of the material.†Guo Shouwu said when discussing the development of “fast-charge and fast-discharge†batteries, “constrained by the low conductivity of traditional battery materials, and the greater power input of lithium-ion batteries/ Actually it is not easy to achieve."
It is reported that Guo Shouwu’s team has made breakthroughs in the preparation, separation, and purification of single-layer graphene oxide and graphene, and explored the development and application of graphene macro-preparation technology and industrialization of product landing. road. The graphene envelops the positive and negative electrode materials of the lithium ion battery, effectively improves the conductivity of the battery material, and successfully realizes its industrial application in the lithium battery industry. The myth of super flash fast charge becomes possible overnight. At the same time, in conjunction with advanced battery grouping technology and battery management system, Shanghai Carbon Resources Huigu New Material Technology Co., Ltd. and Dongxu Optoelectronics Technology Co., Ltd. have jointly developed graphene-based fast-discharge and fast-discharge lithium-ion batteries. "King Wang" mobile power products and power battery modules. Products have the advantages of fast charging and discharging speed, long cycle life, and environmental protection. They are widely used in many fields such as electric bicycles, energy storage systems, and electric vehicles to realize the rapid production and commercialization of lithium ion batteries.
Five Features: New Battery Turns on Energy Revolution
Shorter charging time has become just needed for people to use smart phones, mobile power supplies, and electric vehicles during charging. Whether they can improve the conductivity of battery materials is an important way to improve their rapid charge and discharge performance. The new graphene and graphene-based lithium-ion battery developed by Guo Shouwu's team solves the problems of fast charging and fast-discharging, and combines five characteristics: safety, reliability, environmental protection, and stylish design.
The graphene-based lithium ion fast-discharging and fast-discharging lithium ion battery adopts graphene-coated lithium iron phosphate technology, which can realize the charge-discharge function more quickly. In the past, it took 3.5 hours to fill 5000mAh, now it only takes 15 minutes. Even if you forgot to charge the mobile power the night before, it wouldn't matter. By brushing your teeth in the morning for breakfast, your mobile power supply will be full of blood.
Experiments show that the use of a new material, graphene, can achieve efficient heat dissipation between lithium-ion batteries and the environment. Under the same operating parameters, the temperature increase of graphene-based high-temperature lithium-ion batteries is 5°C lower than that of common lithium-ion batteries; the high-temperature circulation at 60°C is 2000 times, and the capacity retention rate still exceeds 80%. Developed by Guo Shouwu's team, the "Alden King" generation second-generation mobile power source using graphene-based fast-discharge lithium ion batteries has an increased battery operating temperature of 10 degrees Celsius and is free to operate in a temperature range of -30 to 80 degrees Celsius. The temperature range of the "Kingwang" power battery is -20~45°C. Therefore, even if they are used in plateau areas with an altitude of 2000 meters or more, their charge and discharge performance is still stable.
Graphene alkenyl lithium-ion battery products have set overcharge protection, over-discharge protection, over-temperature protection and over-current, while the extremely stable graphene-based cathode material ensures high capacity, long-time discharge, long-term use, and durability. Flow protection, short circuit protection and other safety protection functions ensure the stability and safety of batteries and batteries, eliminating people's worries in the use of batteries.
The king of the second-generation mobile power source is equipped with intelligent sleep technology, does not waste every sub-power, close the bracket automatically power off, but also set up an energy-saving eye-protection LED lamp, using the Hall device to open and close, so that the real one For dual use. At the same time, all of Kingn's battery products do not contain lead, mercury, halides and other harmful substances, and are very friendly to the environment, and can be described as truly green energy.
For the new energy revolution "charge life"
In recent years, the development of new energy vehicles is in full swing. Compared to traditional fuel vehicles that are full of oil for a few minutes, it takes several hours for new energy vehicles to be fully charged. Fast charging technology has become one of the most important factors affecting the rapid spread of electric vehicles under the premise that the charging piles have not yet “emergedâ€. , And fast-charging batteries have become another direction for the development of power lithium-ion batteries.
At the same time, Guo Shouwu's team cooperated with Shanghai carbon sources Huigu and Dongxu Optoelectronics to conduct cooperation in production, learning and research, completed graphene technology and related applied research, and created a new era of domestic lithium ion fast/quick release. 15 minutes super flash fast charge and high security, stood in the commanding heights of the fast-charging battery industry. At present, since the listing of the second-generation mobile power sources, the king of the market has received strong response from the market. The graphite-based fast-charging Li-ion battery for Alden Wang bicycles has also successfully cooperated with shared bicycle companies such as bicycles to achieve large-scale production. In the future, entering the field of new energy vehicles and deepening the extension of the industrial chain on the basis of existing industries will become the next firm goal of the Guo Shouwu team.
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