Application of graphite alkyne materials in lithium ion batteries (a, b), lithium ion capacitors (c) and sodium ion batteries (d)
Structure of Chlorine-based Graphyne and Its Application in Lithium Ion Batteries
Carbon materials are closely related to human life, and graphynes are a new class of carbon materials following fullerenes, carbon nanotubes, and graphene. Structurally speaking, it is the only chemically synthesized compound that contains both sp and sp2 (two different atomic orbital hybrids) and two hybrid forms of carbon. Plane full carbon material. From a performance point of view, graphynes have large conjugation systems, wide surface spacing, excellent electrical conductivity, rich molecular channel structure, and excellent chemical stability. The above-mentioned unique structural features and excellent performance advantages make it possible for graphynes to be widely used in energy storage applications.
Recently, the New Energy Carbon Materials Team of the Institute of Bioenergy and Bioprocess Research of the Chinese Academy of Sciences and the Li Yuliang Research Group of the Institute of Chemistry collaborated to apply graphite acetylene materials to energy storage devices such as lithium-ion batteries, sodium-ion batteries, and lithium ion capacitors. The detailed analysis and systematic study of its electrochemical performance and energy storage mechanism were carried out. Related experimental results have been published.
The researchers of the new energy carbon materials team have given full play to the characteristics of graphitic acetylene materials that can be prepared by chemical methods, attempting to adopt a “bottom up†heteroatom chemical doping synthesis strategy, through chemical reduction and structural modification of polymeric precursors, Chlorine doped graphite alkyne was prepared. The doped graphite acetylene materials prepared by chemical doping method have the characteristics of uniform distribution of heteroatoms, controllable content and doping position. Theoretical calculations also confirmed that the chlorine atom uniformly distributed in the two-dimensional planar structure of graphyne can more effectively stabilize the embedded lithium atom. The device test results show that the chlorine-doped graphitic acetylene is used in lithium-ion battery electrode materials, exhibiting excellent rate performance and good cycle stability, indicating that such materials have application prospects in energy storage. This part of the work was published in Angew. Chem. Int. Ed. (2017, 56, 10740-10745).
The above study has won a major project of the National Natural Science Foundation of China
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