文献类型：期刊文献

英文题名：Structural engineering of hydrated vanadium oxide cathode by K+ incorporation for high-capacity and long-cycling aqueous zinc ion batteries

作者：Tian, Meng[1,2];Liu, Chaofeng[1];Zheng, Jiqi[1];Jia, Xiaoxiao[1];Jahrman, Evan P.[3];Seidler, Gerald T.[3];Long, Donghui[2,4];Atif, Muhammad[5];Alsalhi, Mohamad[5];Cao, Guozhong[1]

机构：[1]Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[3]Univ Washington, Dept Phys, Seattle, WA 98195 USA;[4]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[5]King Saud Univ, Coll Sci, Phys & Astron Dept, Riyadh 11451, Saudi Arabia

年份：2020

卷号：29

起止页码：9

外文期刊名：ENERGY STORAGE MATERIALS

收录：;EI(收录号：20201608435280);WOS:【SCI-EXPANDED(收录号:WOS:000571725100002)】；

基金：This work was supported by the National Science Foundation (CBET-1803256), National Science Foundation of China (No. 21576090), and Fundamental Research Funds for the Central Universities (222201718002). Part of this work was conducted at the Molecular Analysis Facility, a National Nanotechnology Coordinated Infrastructure site at the University of Washington which is supported in part by the National Science Foundation (grant NNCI-1542101), the University of Washington, the Molecular Engineering & Sciences Institute, and the Clean Energy Institute. MT and JZ acknowledge the financial support from CSC for this work at the University of Washington. EPJ was supported by a subcontract from the National Institute of Standards and Technology (NIST). Opinions, recommendations, findings, and conclusions presented in this manuscript and associated materials do not necessarily reflect the views or policies of NIST or the United States Government. The authors also extend their appreciation to the International Scientific Partnership Program (ISPP) at King Saud University for funding this research work through ISPP-139.

语种：英文

外文关键词：Zinc ion batteries; K+ incorporation; Hydrated vanadate; High capacity; Structural engineering

摘要：Vanadium oxides are promising candidates for cathode materials in aqueous zinc-ion batteries (ZIBs) with low cost and high capacity yet requirements for long cycling necessitate the development of increasingly stable structure. This study reports a structural engineering method by incorporating K+ into hydrated vanadium pentoxide (V2O5 center dot nH(2)O, VOH) to achieve unique hydrated vanadate (KV12O30-y center dot nH(2)O, KVOH). In contrast to previously reported works, K+ introduction leads to a new phase of KVOH with faster ion diffusion kinetics and better long-term cycling stability. This work establishes an understanding of the role of K+ incorporation in KVOH which goes beyond its conventional categorization as an agent for interlayer spacing adjustment, reflecting in maintaining structure flexibility for effective Zn2+ insertion/extraction even at high rates, improving materials conductivity by the electron hoping of V4+/V5+ and acting as a stabilizer to accommodate structural contraction/ expansion with smaller voltage hysteresis and higher reversibility. KVOH displays a remarkable capacity of 436 mAh g(-1) at 0.05 A g(-1), maintains 227 mAh g(-1) at 10 A g(-1), which is better than VOH and the majority of reported monovalent and multivalent metal ions introduced in vanadates. KVOH exhibits excellent cycling stability with 92% capacity retention over 3000 cycles at 5 A g(-1), high energy density (308 Wh kg(-1)) and power density (7502 W kg(-1)), as well as improved energy efficiency. These characteristics recommend KVOH cathodes for use in high-performance aqueous ZIBs.