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On August 22, the Institute of Bioenergy and Process Research of the Chinese Academy of Sciences reported that the carbon based materials and energy application research group led by Huang Changshui, a researcher from Qingdao Institute of Energy, designed and synthesized a fluorine substituted graphyne two-dimensional carbon material for the first time, which was applied to the cathode of lithium ion batteries, showing excellent electrochemical energy storage performance. Relevant achievements have been published online in Energy and Environmental Science.

With the development of wearable intelligent devices and implantable medical devices, flexible batteries with high energy density, power density and long cycle life have become a research hotspot in recent years. Due to its unique structural advantages, two-dimensional materials become ideal flexible electrode materials. However, currently known two-dimensional electrode materials often have dense atomic arrangement, which makes the lithium ion transmission between layers encounter large steric hindrance, resulting in lower power density and energy density.

The research group prepared graphyne, nitrogen doped graphyne and graphyne supported iron on different substrates. Researchers have successfully introduced fluorine atoms into the graphyne structure to prepare new carbon based flexible electrode materials, which can greatly promote the development of flexible batteries required for wearing intelligent devices. The graphite alkyne molecular channels are expanded by fluorine substitution, so that it has excellent ion transport channels; At the same time, the basic framework of graphyne and the conjugated system in the two-dimensional planar structure are retained, so that its materials have excellent conductivity and carrier transport properties; In particular, the fluorocarbon bond has excellent cycling lithium storage capacity, which not only increases the lithium storage site of the material, but also has good compatibility with the electrolyte, which can greatly reduce the interface impedance, thus improving the cycling stability.

This achievement provides a research idea for the preparation of large area flexible electrode materials with excellent performance by solution method, and initiates a new direction in the research of new energy storage device electrode materials.

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