Battery industry rookie: graphene-based lithium-sulfur battery

Since the Chinese Academy of Sciences, Shenyang Institute of Materials Science (Joint) Laboratory into Huiming found that graphene can be used as a sulfur electrode and battery separator protection and conductive layer, the graphene lithium-sulfur battery will continue to make new research progress.

In recent years, advanced material and interface physics research team led by Professor Wang Rongming from School of Mathematical Sciences at Beijing University of Science and Technology has carried out a series of research work in the field of material interface structure regulation, characterization and characterization. Team young teachers Dr. Yu Mingpeng and Professor Qiu Hong cooperation in the new graphene-based lithium-sulfur battery cathode material found that the lithium-sulfur battery has a high theoretical energy density (2600 Wh / kg), and elemental sulfur inexpensive and environmentally friendly However, how to improve the utilization rate of active material sulfur and improve the cycle stability has become a major problem at present, which has also caused widespread concern in the scientific community.

In response to the above problems, Dr. Yu Mingpeng and his collaborators prepared carbon-sulfur composites by melting-diffusion method on the basis of preparing N-doped graphene and further studied the interface of carbon-sulfur system by atomic layer deposition (ALD) Regulation. The obtained N-doped graphene has the advantages of high pyridine, pyrrole nitrogen content, large specific surface area and rich pore structure, and greatly improves the surface chemical activity of the graphene. Carbon-sulfur composites can effectively bind polysulfide ions produced during the charge-discharge process by physical adsorption of carbon materials and N-doping chemisorption, and ALD modification can further play the role of in situ adsorption and shielding, thereby being effective Inhibit the charge-discharge process "shuttle effect", and ultimately get excellent electrochemical performance. The author also conducted in-depth study of the binding capacity of oxides and polysulfide ions through theoretical calculations.

The research work has been published by the field's top international academic journal "Energy and Environmental Science". Is another important achievement since the team published a paper in the Nature series and Professor Chen Di team made new progress in the new energy field.