Advanced energy materials:electrochemical energy storage performance improvement of electrode materials based on precise regulation of cation vacancy:synthesis,advanced characterization and Mechanism Discussion

wallpapers Nicaragua News 2021-04-01
In order to meet the increasing energy dem of

the electrochemical energy storage devices represented by transition metal oxides / carbides have been widely concerned. At present the commonly used ways to improve the energy storage performance of electrode materials mainly include the preparation of nano materials or composite with conductive materials. However these two ways are "external" ways which have ceiling effect in practical application. In recent years more more attention has been paid to an "intrinsic" way to improve the electrochemical energy storage performance of electrode materials by introducing point defects (mainly including cationic anionic vacancies) into their lattice. At present the formation of anionic vacancy its effect on energy storage performance have been studied in depth but little is known about the formation mechanism of cationic vacancy its relationship with energy storage performance. Therefore by adjusting the electronic / microscopic / phase structure of transition metal oxides / carbides the accurate control of their cation vacancies can be achieved which undoubtedly provides a new idea method for further improving the electrochemical energy storage characteristics of electrode materials.

recently Professor Liu Jilei's team of Hunan University in cooperation with Professor Stefano Passerini of Helmholtz Institute in Germany published a paper entitled "the role of category Vacances in electronic materials for enhanced electrochemical energy storage: synthesis advanced characterization This review systematically introduces reviews in detail the latest research progress in improving the energy storage performance of transition metal oxide / carbide electrode materials based on the regulation of cation vacancies.

start from the main ways of introducing cation vacancies (such as heterovalent cation (anion) doping acid treatment selective acid (alkali) etching heat treatment plasma etching) combined with a wealth of advanced characterization methods (XAFS X-ray scanning PDF based on synchrotron radiation light source) The formation mechanism of cation vacancy its effect on the electrochemical properties of transition metal oxides / carbides were discussed summarized systematically. The mechanism of reversible charge transfer is: (1) to increase the charge / discharge capacity of the electrode by changing the structure of the electrode; (4) to increase the charge / discharge capacity of the electrode.

this work expounds the mechanism of cation vacancy regulating electrochemical characteristics clarifies the necessity of advanced in-situ characterization technology to explore the process mechanism of energy storage looks forward to the future research direction development trend of energy storage based on cation vacancy. It mainly includes the following four aspects: (1) based on advanced (in-situ) characterization methods accurately capture the overall distribution characteristics of cation vacancy in electrode materials realize the accurate determination of its content; (2) based on in-situ spectral testing technology theoretical calculation further clarify the influence mechanism of cation vacancy on energy storage characteristics from the perspective of micro / phase / electronic structure change build a more accurate model In order to clarify the relationship between cation vacancy energy storage performance; (3) explore the stability of electrode materials containing cation vacancy under extreme working conditions; (4) based on the above in-depth understing of the mechanism further improve the electrochemical characteristics of electrode materials based on the controllable design of cation vacancy.

Assistant Professor Gao Peng of Hunan University is the first author of the paper Dr. Chen Zhen of Helmholtz Institute of Germany is the co first author of the paper Professor Liu Jilei of Hunan University is the corresponding author. The above research has been supported by the National Natural Science Foundation of China the National Youth thous talents program the Huxiang high level talents program the basic scientific research fund of the Central University.

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