According to the Shanghai Institute of Ceramics of the Chinese Academy of Sciences, the scientists have developed a high-performance supercapacitor electrode material, nitrogen-doped ordered mesoporous graphene. This material can be used as a "super battery" for electric vehicles. It takes only 7 seconds to charge and can last for 35 kilometers.
The world's top academic journal Science has published an important research result of a new graphene material developed by the Shanghai Institute of Ceramics of the Chinese Academy of Sciences. According to the Shanghai Institute of Ceramics of the Chinese Academy of Sciences, the high-performance supercapacitor electrode material developed by the institute, the nitrogen-doped ordered mesoporous graphene, has excellent electrochemical energy storage characteristics and can be used as an ultra-electric vehicle. Strong battery": It takes only 7 seconds to charge, and it can last for 35 kilometers.
A supercapacitor is an electrochemical energy storage device between a conventional capacitor and a battery. Due to its high power density, long cycle life, safety and reliability, it has been widely used in hybrid electric vehicles, high-power output equipment and other fields, forming a very large market scale, maintaining nearly 20% of global growth in recent years. The rate and industry prospects are outstanding. However, existing supercapacitors are still limited by low energy density (commercial activated carbon: 5–7 watt-hours/kg), far less than lithium batteries (>80 watt-hours/kg) due to lower specific capacity (<250 Farah/ Gram). How to make supercapacitors combine high power and high energy. Scientists have not found ideal materials for a long time.
In order to solve this problem, the Shanghai Institute of Ceramics of the Chinese Academy of Sciences collaborated with Peking University and the University of Pennsylvania to study a nitrogen-doped ordered mesoporous graphene designed and synthesized by Professor Huang Fuqiang, Professor Chen Yizhen and Dr. Lin Tianquan. It has excellent electrochemical energy storage characteristics and a specific capacity of up to 855 Farads per gram.
Huang Fuqiang introduced that compared with traditional electrode materials, graphene has four prominent advantages: first, high specific surface area is conducive to high energy density; second, ultra high conductivity is conducive to maintaining high power density; third, chemistry The rich structure is conducive to the introduction of tantalum capacitors to improve energy density; fourth, the special electronic structure is beneficial to optimize the relationship between structure and performance.
The assembled symmetrical device is fast charging and fast discharging, no less than commercial carbon-based capacitors. Its superiority stems from the fact that nitrogen doping induces redox reactions and also increases electrochemical energy storage activity without reducing the high conductivity of the material. The symmetrical device developed is safe and non-toxic in aqueous solution, with an energy density of 41 watt-hours/kg (based on active material of 63 watt-hours/kg) and a power density of 26 kW/kg (44 kW/kg based on active material). . Not only can high energy density and high power density be realized, but also water-based electrolyte can be used to achieve non-toxic, environmentally friendly, low-cost, safe and reliable. The new graphene supercapacitor is lightweight and can be scaled up.
According to reports, the new graphene supercapacitor is light in weight, non-flammable and non-explosive, and can be produced at a low cost to achieve scale production. Because the performance has obvious competitive advantages compared with lead-acid, nickel-metal hydride and other batteries, and far superior to lithium batteries in terms of fast charge and discharge, the "super battery" can be widely used in existing hybrid electric vehicles, high-power output devices. Update.
According to authoritative experts, the performance of lead-acid, nickel-metal hydride and other batteries has obvious competitive advantages, and is far superior to lithium batteries in terms of fast charge and discharge. The development of this new graphene supercapacitor has successfully promoted the industry of supercapacitors in China. It is of great significance to develop and enhance the competitive advantage of the industry.
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