Porous copper(Cu)current collectors are regarded as a promising host for stabilizing lithium(Li)metal anodes but suffer from uncontrollable Li metal deposition due to the intrinsic lithiophobic nature of Cu.This study...Porous copper(Cu)current collectors are regarded as a promising host for stabilizing lithium(Li)metal anodes but suffer from uncontrollable Li metal deposition due to the intrinsic lithiophobic nature of Cu.This study proposes a vertically aligned Cu host with hyperbranched CuxO nanostructure to provide lithiophilic nucleation sites for homogeneous Li metal deposition.Specifically,the vertically aligned Cu nanostructure dramatically reduces the local current density and brings homogeneous Li‐ion flux.The lithiophilic hyperbranched CuxO nanostructure with a low nucleation barrier could induce homogeneous Li nucleation and growth.As a result,the Cu@CuxO nanostructured host exhibits a low nucleation overpotential of 44.3 mV and achieves highly electrochemical reversibility with high Coulombic efficiency of 98.33%in a half‐cell.The Cu@CuxO nanostructured electrode is capable of working under different current densities varying from 0.5 to 5 mA/cm2 in a symmetric cell.The assembled full cell coupling of the Li/Cu@CuxO composite anode with the LiFePO4 cathode manifests stable long‐term cycling life at 1 C.This study elaborates on the synergistic effect of electrode structure design and interfacial chemistry modification to regulate the Li deposition/dissolution behavior,thus exhibiting remarkable electrochemical performances for next‐generation Li‐metal batteries.展开更多
Vanadium oxides have attracted extensive interest as electrode materials for many electrochemical energy storage devices owing to the features of abundant reserves,low cost,and variable valence.Based on the in-depth u...Vanadium oxides have attracted extensive interest as electrode materials for many electrochemical energy storage devices owing to the features of abundant reserves,low cost,and variable valence.Based on the in-depth understanding of the energy storage mechanisms and reasonable design strategies,the performances of vanadium oxides as electrodes for batteries have been significantly optimized.Compared to crystalline vanadium oxides,amorphous vanadium oxides(AVOs)show many unique properties,including large specific surface area,excellent electrochemical stability,lots of defects and active sites,fast ion kinetics,and high elasticity.This review gives a comprehensive overview of the recent progress on AVOs for different energy storage systems,such as alkali metal ion batteries,multivalent ion batteries,and supercapacitors with a special focus on the preparation strategies.The basic mechanisms for energy storage performance improvements of AVOs as compared to their crystalline counterparts are also introduced.Finally,challenges faced by AVOs are discussed and future development prospects are also proposed.This review aims to provide a comprehensive knowledge of AVOs and is expected to promote the development of high-performance electrodes for batteries.展开更多
基金Research Startup Fund from NJUPT,Grant/Award Numbers:NY220085,NY220069,NY221128National Natural Science Foundation of China,Grant/Award Numbers:22201135,22203046,52102265,91963119+3 种基金China Postdoctoral Science Foundation,Grant/Award Number:2020M681681Project of State Key Laboratory of Organic Electronics and Information Displays,Nanjing University of Posts and Telecommunications,Grant/Award Numbers:GDX2022010010,GZR2022010017Priority Academic Program Development of Jiangsu Higher Education Institutions,Grant/Award Number:PAPD,YX030003Natural Science Foundation of Jiangsu Province,Grant/Award Numbers:BK20210604,BK20220385。
文摘Porous copper(Cu)current collectors are regarded as a promising host for stabilizing lithium(Li)metal anodes but suffer from uncontrollable Li metal deposition due to the intrinsic lithiophobic nature of Cu.This study proposes a vertically aligned Cu host with hyperbranched CuxO nanostructure to provide lithiophilic nucleation sites for homogeneous Li metal deposition.Specifically,the vertically aligned Cu nanostructure dramatically reduces the local current density and brings homogeneous Li‐ion flux.The lithiophilic hyperbranched CuxO nanostructure with a low nucleation barrier could induce homogeneous Li nucleation and growth.As a result,the Cu@CuxO nanostructured host exhibits a low nucleation overpotential of 44.3 mV and achieves highly electrochemical reversibility with high Coulombic efficiency of 98.33%in a half‐cell.The Cu@CuxO nanostructured electrode is capable of working under different current densities varying from 0.5 to 5 mA/cm2 in a symmetric cell.The assembled full cell coupling of the Li/Cu@CuxO composite anode with the LiFePO4 cathode manifests stable long‐term cycling life at 1 C.This study elaborates on the synergistic effect of electrode structure design and interfacial chemistry modification to regulate the Li deposition/dissolution behavior,thus exhibiting remarkable electrochemical performances for next‐generation Li‐metal batteries.
基金This work was jointly supported by the Project of State Key Laboratory of Organic Electronics and Information Displays,Nanjing University of Posts and Telecommunications(Nos.GZR2022010017 and GDX2022010010)the National Natural Science Foundation of China(Nos.52102265 and 91963119)+2 种基金China Postdoctoral Science Foundation(No.2020M681681)Natural Science Foundation of Jiangsu Province of China(No.BK20210604)Nanjing University of Posts and Telecommunications Start-up Fund(Nos.NY220069 and NY220085).
文摘Vanadium oxides have attracted extensive interest as electrode materials for many electrochemical energy storage devices owing to the features of abundant reserves,low cost,and variable valence.Based on the in-depth understanding of the energy storage mechanisms and reasonable design strategies,the performances of vanadium oxides as electrodes for batteries have been significantly optimized.Compared to crystalline vanadium oxides,amorphous vanadium oxides(AVOs)show many unique properties,including large specific surface area,excellent electrochemical stability,lots of defects and active sites,fast ion kinetics,and high elasticity.This review gives a comprehensive overview of the recent progress on AVOs for different energy storage systems,such as alkali metal ion batteries,multivalent ion batteries,and supercapacitors with a special focus on the preparation strategies.The basic mechanisms for energy storage performance improvements of AVOs as compared to their crystalline counterparts are also introduced.Finally,challenges faced by AVOs are discussed and future development prospects are also proposed.This review aims to provide a comprehensive knowledge of AVOs and is expected to promote the development of high-performance electrodes for batteries.
