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Graphyne, a new all-carbon nanostructure material, follows fullerenes, carbon nanotubes, and graphene. It is a new type of carbon allotrope formed by sp and sp2 hybridization. It is a full carbon material with a two-dimensional planar network structure formed by conjugated 1,3-diyne linkages of benzene rings. The carbon chemical bond, large conjugation system, wide surface spacing, and excellent chemical stability are regarded as the most stable allotrope of a synthetic diacetylenic carbon. Due to its special electronic structure and its excellent semiconductor performance similar to silicon, graphyne is expected to be widely used in electronics, semiconductors and new energy fields.
Theoretical studies show that graphyne is an ideal lithium storage material with a theoretical capacity of 744 mAh g-1 and a theoretical capacity of 1117 mAh g-1 (1589 mAh cm-3) for multilayer graphyne, and its unique structure. It is more conducive to the in-plane and out-of-plane diffusion and transport of lithium ions, thus giving it very good rate performance.
Recently, the research team led by Huang Changshui, a researcher at the Institute of Applied Energy Technology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, collaborated with Li Yuliang, a researcher of the Institute of Chemistry of the Chinese Academy of Sciences. For the first time, graphite acetylene was applied to lithium ion battery electrode materials and electrochemically stored lithium. The performance and mechanism of lithium storage were analyzed in detail. The structure-activity relationship between the structure and morphology of graphyne and its electrochemical performance was elucidated, and the application of graphite alkyne materials in lithium batteries was explored. These studies were of the graphyne family. Lithium storage performance research and exploration of new carbon energy storage materials provide theoretical basis and experimental guidance. The experimental results show that the uniform pore size structure, excellent electronic conductivity, and chemical stability of the graphyne give excellent electrochemical performance in terms of higher capacity, excellent rate performance, and cycle life of the graphyne. The above cooperative research results prove that graphyne is a very promising lithium storage energy material. The relevant research results were published in Nano Energy, 2015, 11, 481-489; Chem. Commun., 2015, 51, 1834-1837.
The above research was supported by projects such as the "Hundred Talents Program" and "973" programs of the Chinese Academy of Sciences and the National Natural Science Foundation.
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