High-rate performance magnesium batteries achieved by direct growth of honeycomb-like V_(2)O_(5)electrodes with rich oxygen vacancies  

作　　者：Dongzheng Wu Yichao Zhuang Fei Wang Yang Yang Jing Zeng Jinbao Zhao 

机构地区：[1]College of Chemistry and Chemical Engineering,State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle,State Key Laboratory of Physical Chemistry of Solid Surfaces,Engineering Research Center of Electrochemical Technology,Ministry of Education,Collaborative Innovation Center of Chemistry for Energy Materials,Xiamen University,Xiamen 361005,China [2]School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China

出　　处：《Nano Research》2023年第4期4880-4887,共8页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(Nos.21875198,22005257,and 22021001);Natural Science Foundation of Fujian Province of China(No.2020J05009)for financial support.

摘　　要：Rechargeable magnesium batteries(RMBs)have emerged as a promising next-generation electrochemical energy storage technology due to their superiority of low price and high safety.However,the practical applications of RMBs are severely limited by immature electrode materials.Especially,the high-rate cathode materials are highly desired.Herein,we propose a dualfunctional design of V_(2)O_(5)electrode with rational honeycomb-like structure and rich oxygen vacancies to enhance the kinetics synergistically.The result demonstrates that oxygen vacancies can not only boost the intrinsic electronic conductivity of V_(2)O_(5),but also enhance the Mg^(2+)diffusion kinetics inside the cathode,leading to the good high-rate performance.Moreover,ex-situ X-ray diffraction(XRD),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS)characterizations reveal that Mg^(2+)is mainly intercalated from the(101)plane of V_(2)O_(5)−X based on the insertion-type electrochemical mechanism;meanwhile,the highly reversible structure evolution during Mg^(2+)insertion/extraction is also verified.This work proposes that the dual-functional design of electrode has a great influence in enhancing the electrochemical performance of cathode materials for RMBs.

关 键 词：V2O5 rechargeable magnesium batteries oxygen vacancies kinetics electronic conductivity 

分 类 号：O64[理学—物理化学]