According to a report by the American Physicist Network on November 29, the research team of the Pacific Northwest National Laboratory (PNNL) used a new approach to construct porous layered graphene for lithium-air batteries. The shape of the graphene-based graphene structure is similar to that of the broken eggshell, which can greatly improve the energy storage capacity of the lithium-air battery. It is expected to replace the traditional smooth graphene sheet used in electric vehicles in the future, and solve the problem of ordinary graphene in use. Easy to be troubled by particles blocking. Related research reports were published in the recently published Nano Express magazine.
Researchers say self-assembled multilayer graphene sheets are not only ideal for lithium-air batteries, but can also be used in many other potential energy storage applications. In addition, the new graphene materials will not depend on platinum or other precious metals, which can effectively reduce costs and environmental impact.
Lithium-air batteries can support remote electric vehicles. Although their weight is very light, their application is still limited by the actual energy storage capacity and poor cycle life. This study shows how to maximize battery capacity. According to materials scientists, this is critical for applications in electric vehicles and energy storage.
The research team first combined the binder with graphene and dispersed the graphene in the solution by means of a binder, just like using soap to decompose the oil in water. Then the graphene and the binder were mixed into water to form a solution. The bubbles cause the graphene and the binder to form and harden around the bubble. When the bubble finally blasts, a hollow sphere has formed in the graphene. This tiny black particle is only 3 microns to 4 microns in diameter, which is 10 times thinner than human hair.
Using modeling and microscopy, scientists analyzed the structure and properties of the new graphene. They found that graphene per gram of porous structure can store an additional 15,000 mAh of energy, far better than the performance of other materials.
Dr. Zhang Jiguang, the leader of the study, said: "We are studying a variety of catalysts that can be used in this technology, but will not use precious metals, which will significantly reduce production costs and increase applicability."
At present, the battery can reach the highest level of energy storage capacity only in the pure oxygen environment. When operating in the air, the energy storage capacity will be reduced due to the influence of water in the air on lithium metal. The research team is working on a film that blocks the water in the air and allows the necessary oxygen to flow.
Dr. Zhang also said that the current lithium-ion battery based on the new graphene material can not be fully recharged. It is developing a new type of electrolyte and catalyst to achieve multiple charging of the battery, providing battery applications requiring high energy density. Backup support.
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