On March 18th, the Photonic Information and Energy Materials Research Center of the Institute of Materials Science and Technology, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences made new progress in the research of negative electrode materials for new high-performance potassium ion batteries: The theory predicts that styrene materials are very Potential anode materials for potassium ion batteries, based on a large number of calculated simulation data indicate that styrene materials have very high theoretical specific capacity and very small volume expansion when used as anode materials for potassium ion batteries. Related achievements were published in the journal Journal of Physical Chemistry C (DOI: 10.1021 / acs.jpcc) under the title [n] Phenacenes: Promising Organic Anodes for Potassium-Ion Batteries. 9b10930). Because of its advantages in cost and environment, potassium ion batteries are considered to be one of the best alternatives to lithium ion batteries, and thus have been widely studied; however, on the negative electrode material side, because potassium has a larger ion radius than lithium, it is commonly used The negative electrode materials such as graphite, silicon and micro-nano porous materials expand too much when inserting potassium, which leads to the problem of too low potassium storage capacity. In order to solve the above problems, Dr. Zhong Guohua and his collaborators of Shenzhen Advanced Institute proposed the idea of ​​using styrene material as the anode material of potassium ion battery based on high-throughput calculation and first-principles material design. The researchers inserted / extracted potassium ions in porous or layered crystalline materials made of styrene to study the entire static and dynamic process. A large number of data results indicate that the theoretical specific capacity of potassium ions embedded in styrene materials can be as high as 700 mAh / g or more, and the volume expansion rate of the material during the insertion / extraction of potassium ions is less than 50%. In addition, the material also has better conductivity and a smaller open circuit voltage, making it provide a larger voltage window. These data show that styrene has advantages over graphite and other materials in potassium storage and safety, and is a very promising anode material for potassium ion batteries. The research was supported by the Shenzhen Basic Research Layout Project and Peacock Project.
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Comparison of the theoretical specific capacity (lower left) and open circuit voltage (lower right) of styrene material (top) when potassium is embedded with other materials 
Shenzhen Advanced Institute made progress in the research of high-performance potassium ion battery anode materials