Qingdao Energy Research Institute developed a new type of two-dimensional flexible electrode material


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 a research hotspot in recent years. Due to its unique structural advantages, two-dimensional materials have become ideal flexible electrode materials. However, the currently known two-dimensional electrode materials often have dense atomic arrangements, which makes the transport of lithium ions between layers encounter greater steric hindrance, resulting in lower power density and energy density.

Recently, 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 Huang Changshui, a researcher at the Qingdao Institute of Bioenergy and Processes, Chinese Academy of Sciences, designed and synthesized for the first time the fluorine-substituted graphyne 2D carbon material for lithium ion batteries The negative electrode shows excellent electrochemical energy storage performance. Related results have been published online in Energy & Environmental Science.

The research group recently reported the preparation of graphyne on different substrates (Chemical Communications, 2018, 54, 6004), nitrogen-doped graphyne (Carbon, 2018, 137, 442), and graphene supported iron (2D Materials, 2018, DOI : 10.1088 / 2053-1583 / aacba5). The researchers have successfully introduced fluorine atoms into the graphene structure and prepared new carbon-based flexible electrode materials, which will greatly promote the development of flexible batteries for smart devices. As shown in the figure, the substitution of fluorine makes the graphene molecular pores expand, and also has excellent ion transmission channels under AB accumulation; at the same time, the basic frame of graphyne and the conjugate system in the two-dimensional planar structure are retained, making it The material has excellent conductivity and carrier transport characteristics; especially the fluorocarbon bond has excellent cyclic lithium storage capacity, not only increases the lithium storage site of the material, but also has good compatibility with the electrolyte , Can greatly reduce the interface impedance, thereby improving the cycle stability. The results of this study provide research ideas for the preparation of flexible electrode materials with large area and excellent performance by the solution method, and create a new direction for the research of electrode materials for new energy storage devices (Energy & Environmental Science, 2018, DOI: 10.1039 / C8EE01642A).

The research was supported by the National Natural Science Foundation of China, the Frontier Key Research Project of the Chinese Academy of Sciences, and the Shandong Provincial Natural Science Foundation Outstanding Youth Fund.

Figure: Application of fluorine-substituted graphyne in flexible batteries

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