Novel high-voltage cathode for aqueous zinc ion batteries:Porous K_(0.5)VOPO_(4)·1.5H_(2)O with reversible solid-solution intercalation and conversion storage mechanism  

作　　者：Liyu Wang Mingliang Zhao Xiaoyu Zhang Menghua Wu Yu Zong Yu Chen Xinliang Huang Mingjie Xing Xin Ning Wen Wen Daming Zhu Xiaochuan Ren 

机构地区：[1]Industrial Research Institute of Nonwovens&Technical Textiles,College of Textiles&Clothing,Shandong Engineering Research Center for Specialty Nonwoven Materials,Qingdao University,Qingdao 266071,Shandong,China [2]Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China

出　　处：《Journal of Energy Chemistry》2024年第6期71-78,I0003,共9页能源化学（英文版）

基　　金：financially supported by National Natural Science Foundation of China(No.52102270);the Natural Science Foundation of Shandong Province of China(ZR2021QE002);the support from the Institute startup grant from Qingdao University;the Shandong Center for Engineered Nonwovens(SCEN)。

摘　　要：Cathode materials that possess high output voltage,as well as those that can be mass-produced using facile techniques,are crucial for the advancement of aqueous zinc-ion battery(ZIBs)applications,Herein,we present for the first time a new porous K_(0.5)VOPO_(4)·1.5H_(2)O polyanionic cathode(P-KIVP)with high output voltage(above 1.2 V)that can be manufactured at room temperature using straightforward coprecipitation and etching techniques.The P-KVP cathode experiences anisotropic crystal plane expansion via a sequential solid-solution intercalation and phase co nversion pathway throughout the Zn^(2+)storage process,as confirmed by in-situ synchrotron X-ray diffraction and ex-situ X-ray photoelectron spectroscopy.Similar to other layered vanadium-based polyanionic materials,the P-KVP cathode experiences a progressive decline in voltage during the cycle,which is demonstrated to be caused by the irreversible conversion into amorphous VO_(x).By introducing a new electrolyte containing Zn(OTF)_(2) to a mixed triethyl phosphate and water solution,it is possible to impede this irreversible conversion and obtain a high output voltage and longer cycle life by forming a P-rich cathode electrolyte interface layer.As a proof-of-concept,the flexible fiber-shaped ZIBs based on modified electrolyte woven into a fabric watch band can power an electronic watch,highlighting the application potential of P-KVP cathode.

关 键 词：Aqueous zinc ion battery CATHODE Porous material High voltage platform In-situ synchrotron X-ray diffraction 

分 类 号：TM912[电气工程—电力电子与电力传动]