On the 22nd, the reporter learned from the Institute of Bioenergy and Process of the Chinese Academy of Sciences that under the guidance of Li Yuliang, an academician of the Chinese Academy of Sciences, the carbon-based materials and energy application research group led by the researcher of the Qingdao Energy Institute Huang Changshui designed and synthesized the fluorine-substituted graphene two-dimensional for the first time. Carbon materials, used in lithium ion battery anodes, show excellent electrochemical energy storage performance. Related results have been published online in Energy and Environmental Science.
With the development of wearable smart devices and implantable medical devices, flexible batteries with high energy density, power density and long cycle life have become hotspots in recent years. Due to the unique structural advantages, two-dimensional materials have become ideal flexible electrodes. Materials. However, currently known two-dimensional electrode materials tend to have a dense atomic arrangement, which causes lithium ions to encounter large steric hindrance between layers, resulting in lower power density and energy density.
The research team prepared graphite alkyne on different substrates, nitrogen-doped graphite alkyne, and graphite alkyne supported iron. The researchers succeeded in introducing fluorine atoms into the graphite alkyne structure, and prepared a new carbon-based flexible electrode material, which greatly promoted wear. Development of flexible batteries required for smart devices, etc. By fluorine substitution, the pores of the graphene alkene are enlarged to have excellent ion transport channels; at the same time, the basic framework of the graphene and the conjugate system in the two-dimensional planar structure are retained, The material has excellent conductivity and carrier transport properties; especially the fluorocarbon bond has excellent cycle lithium storage capacity, which not only increases the lithium storage site of the material, but also has a good compatibility between the carbon and fluorine bonds and the electrolyte. Sex, can greatly reduce the interface impedance, thereby improving cycle stability.
This achievement provides a research idea for the preparation of flexible electrode materials with excellent performance in large area by solution method, and opens up a new direction for the research of electrode materials for new energy storage devices.
