Wearable smart devices are one of the important symbols of future science and social progress, and also a major strategic requirement of the country. Its long-term endurance capacity depends on high-performance flexible energy storage batteries. In response to the scientific issue of how to improve the flexibility and capacity of electrode materials, under the guidance of Li Yuliang, an academician of the Chinese Academy of Sciences, the new energy carbon materials team of the Institute of Bioenergy and Process Research of the Chinese Academy of Sciences cooperated with the Institute of Chemistry of the Chinese Academy of Sciences to develop a graphite alkyne. The base molecular materials have changed the concept of traditional battery materials and realized the preparation of high-performance flexible batteries. The research was highly original and was published online at Nature Communications.
Due to its peculiar sp-hybrid electronic structure and the naturally occurring super-large pore structure, graphitic acetylene materials play a key role in the transport of electrons, ions, and substances. The properties shown are irreplaceable by other materials. The preparation of high-performance devices, especially wearables, has important scientific significance and is considered to be a key material for next-generation energy, optoelectronics, catalysis, and microelectronics devices, and has attracted international attention. Based on the previous study of graphyne, the researchers changed traditional concepts, creatively developed cross-disciplinary studies based on graphyne materials, focused on the energy and structure problems of graphyne, considered the large π system of graphyne, and natural Ion transport channels, using hydrogen instead of acetylene bonds, improve the molecular channel diameter of the graphyne ion transport, increase the active sites for metal ion storage, and achieve material flexibility and high capacity for lithium storage and sodium storage, from the molecular level The correlation between the self-conversion of the graphite alkyne conductive skeleton and the insertion and extraction process of lithium and sodium ions was explained. A new concept was established and some important scientific issues in this field were solved. The electrochemical lithium storage and sodium performance with excellent performance was obtained. The theoretical calculations confirmed the consistency between the above experimental results and the theoretical analysis process. In particular, the electrochemical sodium storage capacity demonstrated by this material in the test and research of sodium-ion batteries has a leading position in the same type of materials, and may well be a new generation of high-performance, flexible energy storage batteries, which will be the future of China's electrochemical energy storage devices. The research has brought new perspectives and new ideas and will actively promote the research and development of new energy and new materials in China during the 13th Five-Year Plan period.
The research work was supported by the National Natural Science Foundation of China's major projects and projects, the Frontier Science Research Program of the Chinese Academy of Sciences, the "Hundred Talents Program" of the Chinese Academy of Sciences, and the Natural Science Foundation of Shandong Province's Outstanding Youth Fund.
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