MXene-mediated regulation of local electric field surrounding polyoxometalate nanoparticles for improved lithium storage

作     者：Huixia Chao Yanan Li Yukun Lu Yazhen Yao Yifan Zhu Hao Yang Kai Wang Yi Wan Qian Xu Lu Guan Han Hu Mingbo Wu 晁会霞;李雅楠;卢玉坤;姚亚珍;朱一凡;杨浩;王凯;万弋;徐倩;关露;胡涵;吴明铂

作者机构：State Key Laboratory of Heavy Oil ProcessingInstitute of New EnergyCollege of Chemical EngineeringChina University of Petroleum(East China)Qingdao 266580China College of Electrical EngineeringQingdao UniversityQingdao 266071China 

出 版 物：《Science China Materials》 (中国科学（材料科学（英文版）)

年 卷 期：2022年第65卷第11期

页      面：2958-2966页

核心收录：

学科分类：0808[工学-电气工程] 07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(21975258,22179145,and 22138013) the Natural Science Foundation of Shandong Province(ZR2020ZD08) the startup support grant from China University of Petroleum(East China) Taishan Scholar Project(ts201712020) 

主　　题：local electric field polyoxometalate nanoparticles MXenes lithium storage 

摘      要：Due to their capability of reversibly accepting multi lithium ions,polyoxometalates(POMs)have been widely regarded as promising candidates for electrochemical lithium ***,the insulating nature of POMs hinders fast migration kinetics of lithium within the bulk of these ***,we propose the introduction of a local electric field surrounding the POM nanoparticles consisting of Mn and V where the concomitant Coulomb forces can accelerate the migration of lithium *** rationally hybridizing POMs with MXene nanosheets,the imbalanced charge distribution emerging at their interface produces the local electric field,thereby leading to a 250-fold increase of lithium diffusion *** this regard,a capacitive contribution as high as 81.7%at 1.0 mV sis ***,the POM nanoparticles could densely assemble on the surface of MXene nanosheets,offering highly packed electrodes and thus high volumetric *** to the improved lithiumion transfer kinetics,the POMs/MXenes composites are paired with activated carbon to produce lithium-ion capacitors which could offer a high energy density of 195.5 W h kgand a large power capability of 3800 W *** findings in this work could build a clear relationship between materials with different conductivities for designing electrode materials.