Li-rich Mn-based cathode materials possess a high specific capacity,but their application is hindered by their inherent anion activity and surface instability.Herein,we propose the design of a spinel heterogeneous int...Li-rich Mn-based cathode materials possess a high specific capacity,but their application is hindered by their inherent anion activity and surface instability.Herein,we propose the design of a spinel heterogeneous interface with oxygen buffering effects in the Li_(1.2)Mn_(0.6)Ni_(0.2)O_(2)hollow architecture by Ce intervention.The hollow architecture shortens the Li-ion diffusion paths.Ce intervention induces the spinel phase formed on the subsurface,and then constructs a phase boundary to restrain the outward migration of bulk oxygen anions and promote charge transfer.The formed LiCeO_(2)coating layer with oxygen vacancies accelerates the diffusion of Li ions and decelerates electrolyte corrosion.Moreover,Ce doping in the bulk phase effectually stabilizes the evolution of lattice oxygen and suppresses the structural deformation.The prepared Li_(1.2)Mn_(0.6)Ni_(0.2)CexO_(2)-y-LiCeO_(2)(LLO@Ce-LCO)cathode exhibits a remarkable reversible capacity(267.3 mA h g^(-1)at 20 mA g^(-1))and great cycling stability(capacity retention of about 86%after 200 cycles at 200 mA g^(-1)).This hollow architecture and spinel heterogeneous interface strategy provide a novel approach for achieving high-performance cathode materials.展开更多
基金supported by the Department of Science and Technology of Guangxi Province(grant nos AB21220027,AD19110077)the Guangxi Innovation Research Team Project(grant no.2018GXNSFGA281001)+6 种基金the National Natural Science Foundation of China(grant no.21805055)the Guangxi Bagui Scholar Foundation,Chinesisch-Deutsche Kooperationsgruppe(GZ1528)the Guangxi Natural Science Foundation(grant nos 2018GXNSFAA138064,2020GXNSFAA159037,and 2020GXNSFAA159059)the Guangxi Key Laboratory of Manufacturing Systems Foundation(grant no.20-065-40-005Z)the Engineering Research Center Foundation of Electronic Information Materials and Devices(grant no.EIMD-AA202005)the Science and Technology Development Project of Guilin(grant nos 20210216-1 and 20210102-4)the Innovation Project of GUET Graduate Education(grant no.2020YCXS011 and 2022YCXS016).
文摘Li-rich Mn-based cathode materials possess a high specific capacity,but their application is hindered by their inherent anion activity and surface instability.Herein,we propose the design of a spinel heterogeneous interface with oxygen buffering effects in the Li_(1.2)Mn_(0.6)Ni_(0.2)O_(2)hollow architecture by Ce intervention.The hollow architecture shortens the Li-ion diffusion paths.Ce intervention induces the spinel phase formed on the subsurface,and then constructs a phase boundary to restrain the outward migration of bulk oxygen anions and promote charge transfer.The formed LiCeO_(2)coating layer with oxygen vacancies accelerates the diffusion of Li ions and decelerates electrolyte corrosion.Moreover,Ce doping in the bulk phase effectually stabilizes the evolution of lattice oxygen and suppresses the structural deformation.The prepared Li_(1.2)Mn_(0.6)Ni_(0.2)CexO_(2)-y-LiCeO_(2)(LLO@Ce-LCO)cathode exhibits a remarkable reversible capacity(267.3 mA h g^(-1)at 20 mA g^(-1))and great cycling stability(capacity retention of about 86%after 200 cycles at 200 mA g^(-1)).This hollow architecture and spinel heterogeneous interface strategy provide a novel approach for achieving high-performance cathode materials.
