December 18, Chinese Academy of Sciences, Shanghai, said the silicate, the scientists have developed a high performance supercapacitor electrode material - nitrogen-doped ordered mesoporous graphene. The material can be used as a "super battery" of electric cars, charging only 7 seconds, you can life 35 km.
The world's top academic journal "Science" published the Chinese Academy of Sciences, Shanghai Institute of Silicate developed a new graphene material important research results. According to the Chinese Academy of Sciences, Shanghai, said silicate, the scientists have developed a high-performance supercapacitor electrode material - nitrogen doped ordered mesoporous graphene has excellent electrochemical energy storage characteristics can be used as electric vehicles "super Strong battery ": charging only 7 seconds, you can life 35 km.
Supercapacitor, is an electrochemical energy storage device between the traditional capacitor and battery. Due to its high power density, long cycle life, safety and reliability, it has been widely used in many fields such as hybrid electric vehicles and high-power output devices to form a very impressive market. In recent years, it has maintained nearly 20% global growth Rate, the industry outlook is outstanding. However, the current supercapacitors are still limited to low energy density (commercial activated carbon: 57Wh / kg), far less than lithium batteries (> 80Wh / kg) due to the lower specific capacity (<250 Farads per gram ). How to make the super capacitor both high power, high energy, scientists have long found no ideal material.
To solve this problem, the Chinese Academy of Sciences, Shanghai Institute of Ceramics and Peking University, the University of Pennsylvania collaborative research, Huang Fuqiang researcher, Professor Chen Yiwei, Dr. Lin Tianquan designed and synthesized a nitrogen-doped ordered mesoporous graphene, Has excellent electrochemical energy storage characteristics, specific capacity up to 855 Farads / grams.
Huang Fuqiang introduced, compared with the traditional electrode materials, graphene has four prominent advantages: First, the high specific surface area is conducive to the generation of high energy density; second, ultra-high conductivity conducive to maintaining high power density; Third, the chemical The structure is rich in conducive to the introduction of pseudocapacitance to improve energy density; Fourth, a special electronic structure is conducive to optimizing the relationship between structure and performance.
Assembled into a symmetrical device can quickly charge and discharge quickly, as much as commercial carbon-based capacitors. Its superiority stems from: nitrogen doping induced redox reactions, but also increased the electrochemical energy storage activity, and did not reduce the high conductivity of the material. The developed symmetric device is safe and non-toxic to work in aqueous solution with an energy density of 41 Wh / kg (63 Wh / kg based on active material) and a power density of 26 kW / kg (based on 44 kW / kg of active material) . Not only can achieve high energy density, high power density, but also through the use of water-based electrolyte, so that non-toxic, environmentally friendly, low cost, safe and reliable. The new graphene supercapacitors are compact and capable of mass production.
According to reports, the new graphene supercapacitors lightweight, non-flammable nor explosive, can be prepared at low cost, to achieve large-scale production. Because of its performance than lead-acid, nickel-metal hydride batteries and other batteries have obvious competitive advantages, and in terms of fast charging and discharging is far superior to lithium batteries, so the "super battery" can be widely used in existing hybrid electric vehicles, high-power output devices The replacement.
According to authoritative experts, due to the performance of lead-acid batteries, nickel-metal hydride batteries have obvious competitive advantages in the rapid charge and discharge is far superior to lithium batteries, the new graphene supercapacitor successfully developed to promote China's supercapacitor industry It is of great significance to develop and enhance the competitive advantage of the industry.
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