首页|Boron-doped high-entropy oxide toward high-rate and long-cycle layered cathodes for wide-temperature sodium-ion batteries
Boron-doped high-entropy oxide toward high-rate and long-cycle layered cathodes for wide-temperature sodium-ion batteries
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O3-type layered metal oxides hold great promise for sodium-ion batteries cathodes owing to their energy density advantage.However,the severe irreversible phase transition and sluggish Na+diffusion kinetics pose significant challenges to achieve high-performance layered cathodes.Herein,a boron-doped O3-type high entropy oxide Na(Fe0.2Co0.15Cu0.05Ni0.2Mn0.2Ti0.2)B0.02O2(NFCCNMT-B0.02)is designed and the covalent B-O bonds with high entropy configuration ensure a robust layered structure.The obtained cathode NFCCNMT-B0.02 exhibits impressive cycling performance(capacity retention of 95％and 82％after 100 cycles and 300 cycles at 1 and 10 C,respectively)and outstanding rate capability(capacity of 83 mAh g-1 at 10 C).Furthermore,the NFCCNMT-B0.02 demonstrates a superior wide-temperature performance,maintaining the same capacity level(113.4 mAh g-1@-20 ℃,121 mAh g-1@25 ℃,and 119 mAh g-1@60 ℃)and superior cycle stability(90％capacity retention after 100 cycles at 1 C at-20 ℃).The high-entropy configuration design with boron doping strategy contributes to the excellent sodium-ion storage performance.The high-entropy configuration design effectively suppresses irreversible phase transitions accompanied by small volume changes(ΔV=0.65 Å3).B ions doping expands the Na layer distance and enlarges the P3 phase region,thereby enhancing Na+diffusion kinetics.This work offers valuable insights into design of high-performance layered cathodes for sodium-ion batteries operating across a wide temperature.
High entropy oxideBorn substitutionPhase transitionNa+diffusion kineticsSodium-ion batteries
School of Materials Science and Engineering,Northeastern University,Shenyang 110819,Liaoning,China
School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,Hebei,China
Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province,Qinhuangdao 066004,Hebei,China
Neutron Scattering Laboratory,Department of Nuclear Physics,China Institute of Atomic Energy,Beijing 102413,China
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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaHebei Province"333 talent project"Science and Technology Project of Hebei Education DepartmentHebei Province Graduate Innovation Funding Program
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