Construction of the Fast Potassiation Path in SbxBi1-x@NC Anode with Ultrahigh Cycling Stability for Potassium-Ion Batteries
作者:Liu, JH (Liu, Junhao) [1] ; Zhang, DT (Zhang, Dantong) [2] ; Cui, J (Cui, Jie) [3] ; Li, PH (Li, Peihang) [1] ; Xu, XJ (Xu, Xijun) [1] ; Liu, ZB (Liu, Zhengbo) [1] ; Liu, JW (Liu, Jiangwen) [1] ; Peng, C (Peng, Chao) [2] ; Xue, DF (Xue, Dongfeng) [2] ; Zhu, M (Zhu, Min) [1] ;
DOI10.1002/smll.202301444
在线发表APR 2023
已索引2023-05-07
文献类型Article; Early Access
摘要
Due to the scarce of lithium resources, potassium-ion batteries (PIBs) have attracted extensive attention due to their similar electrochemical properties to lithium-ion batteries (LIBs) and more abundant potassium resources. Even though there is considerable progress in SbBi alloy anode for LIBs and PIBs, most studies are focused on the morphology/structure tuning, while the inherent physical features of alloy composition's effect on the electrochemical performance are rarely investigated. Herein, combined the nanonization, carbon compounding, and alloying with composition regulation, the anode of nitrogen-doped carbon-coated SbxBi1-x (SbxBi1-x@NC) with a series of tuned chemical compositions is designed as an ideal model. The density functional theory (DFT) calculation and experimental investigation results show that the K+ diffusion barrier is lower and the path is easier to carry out when element Bi dominates the potassiation reaction, which is also the reason for better circulation. The optimized Sb0.25Bi0.75@NC shows an excellent cycling performance with a reversible specific capacity of 301.9 mA h g(-1) after 500 cycles at 0.1 A g(-1). Meanwhile, the charge-discharge mechanism is intuitively invetigated and analyzed by in situ X-ray diffraction (XRD) and transmission electron microscopy (TEM) in detail. Such an alloy-type anode synthesis approach and in situ observation method provide an adjustable strategy for the designing and investigating of PIB anodes.
关键词
作者关键词potassium-ion batteries (PIBs)Sb-Bi alloy (SbBi)potassiationdepotassiation mechanismpotassiation pathcomposition regulation
Keywords PlusHIGH-PERFORMANCE ANODECARBON COMPOSITELITHIUM-IONNA-IONLI-IONMICROSPHERESNANOSPHERESNANOTUBES
作者信息
通讯作者地址
Liu, Jun
(通讯作者)
South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Peoples R China
所属机构
South China University of Technology
地址
1 South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Peoples R China
2 Chinese Acad Sci, Inst Adv Mat Sci & Engn, Shenzhen Inst Adv Technol, Multiscale Crystal Mat Res Ctr, Shenzhen 518055, Peoples R China
3 South China Univ Technol, Analyt & Testing Ctr, Guangzhou 510640, Peoples R China
电子邮件地址msjliu@scut.edu.cn
类别/分类
研究方向ChemistryScience & Technology - Other TopicsMaterials SciencePhysics
Web of Science 类别Chemistry, MultidisciplinaryChemistry, PhysicalNanoscience & NanotechnologyMaterials Science, MultidisciplinaryPhysics, AppliedPhysics, Condensed Matter