Regulating Built-in Polar States via Atomic Self-Hybridization for Fast Ion Diffusion Kinetics in Potassium Ion Batteries

扫码查看

原文链接

万方数据
维普

外文摘要：Potassium ion batteries(PIBs)are of great interest owing to the low cost and abundance of potassium resources,while the sluggish diffusion kinetics of K+in the electrode materials severely impede their practical applications.Here,self-hybridized BiOCl0,sBr0.5 with a floral structure is assembled and used as anode for PIBs.Based on the systematic theoretical calculation and experimental analysis,the unbalance of charge distribution between Cl and Br atoms leads to an enhanced built-in electric field and a larger interlayer spac-ing,which can enhance the K+diffusion.Furthermore,the K+insertion causes the energetic evolution of polar states in the BiOClo.5Bro.5 crystal framework,where the dynamic correlation between the K+and the halogen atoms leads to the formation of hole-like polarons,which significantly improves the K+diffusion and reaction kinetics during the charging/discharging process,giving important implica-tions to design the electrode materials with high electrochemical performance by engineering the interaction between electronic structure and interface.Therefore,the BiOCl0.sBr0.5 anode obtains an excellent performance of 171 mAh·g-1 at 1 A·g-1 over 2000 cycles in PIBs.

外文关键词：

Bismuth oxyhalideSelf-hybridized structurePotassium-ion batteryPolar statesDensity functional theory

作者：

Hongwei Du、Xiaoyun Zhou、Tao Li、Wen Zhao、Dan Zhou、Dawei Yang、Tianli Wu、Ying Xu

展开 >

作者单位：

Henan Key Laboratory of Quantum Materials and Quantum Energy,School of Future Technology,Henan University,Kaifeng,Henan 475004,China

School of Materials and Energy,Lanzhou University,Lanzhou,Gansu 730000,China

Department of Materials Science and Engineering,University of Connecticut,Storrs,Connecticut 06269,United States

出版年：

2024

DOI：

10.1002/cjoc.202400335

中国化学(英文版)

中国化学会上海有机化学研究所

中国化学(英文版)

CSTPCD

影响因子：0.848

ISSN：1001-604X

年,卷(期)：2024.42(21)