Trimming the Degrees of Freedom via a K^(+) Flux Rectifier for Safe and Long‑Life Potassium‑Ion Batteries

作     者：Xianhui Yi Apparao MRao Jiang Zhou Bingan Lu Xianhui Yi;Apparao M.Rao;Jiang Zhou;Bingan Lu

作者机构：School of Physics and ElectronicsHunan UniversityChangsha 410082People’s Republic of China Department of Physics and AstronomyClemson Nanomaterials InstituteClemson UniversityClemsonSC 29634USA School of Materials Science and EngineeringCentral South UniversityChangsha 410083People’s Republic of China State Key Laboratory of Advanced Design and Manufacturing for Vehicle BodyHunan UniversityChangsha 410082People’s Republic of China 

出 版 物：《Nano-Micro Letters》 (纳微快报（英文版）)

年 卷 期：2023年第15卷第11期

页      面：157-171页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：supported by the National Natural Science Foundation of China(Nos.U20A20247 and 51922038).A.M.R.acknowledges the seed funding provided by the R.A.Bowen Endowed Professorship funds at Clemson University 

主　　题：Electrolytes Degrees of freedom Safe Coulombic efficiency Potassium-ion batteries 

摘      要：High degrees of freedom(DOF)for K^(+)movement in the electrolytes is desirable,because the resulting high ionic conductivity helps improve potassium-ion batteries,yet requiring support from highly free and flammable organic solvent molecules,seriously affecting battery ***,we develop a K^(+)flux rectifier to trim K ion’s DOF to 1 and improve electrochemical *** the ionic conductivity is compromised in the K^(+)flux rectifier,the overall electrochemical performance of PIBs was *** oxidation stability improvement from 4.0 to 5.9 V was realized,and the formation of dendrites and the dissolution of organic cathodes were ***,the K||K cells continuously cycled over 3,700 h;K||Cu cells operated stably over 800 cycles with the Coulombic efficiency exceeding 99%;and K||graphite cells exhibited high-capacity retention over 74.7%after 1,500 ***,the 3,4,9,10-perylenetetracarboxylic diimide organic cathodes operated for more than 2,100 cycles and reached year-scale-cycling *** fabricated a 2.18 Ah pouch cell with no significant capacity fading observed after 100 cycles.