Na-based layered transition metal oxides with O3-type structure have been considered to be promising cathodes for Na-ion batteries.However,the intrinsically limited Na-ion conductivity induced by the O-type Na-coordinate environment compromises their rate and cycle capability,hindering their practical application.Here,we report an interphase-structure tailoring strategy that improves the electrochemical properties of O3-type layered cathodes achieved through surface coating and doping processes.Specifically,a Zr-doped interphase structure is designed in the model compound NaNi1/3Mn1/3Fe1/3O2 using the ionic conductor Na3Zr2Si2PO12 as the surface coating material and Zr-dopant provider.We dis-cover that the modified NaNi1/3Mn1/3Fe1/3O2 cathode shows a stable Na-storage structure as well as an enhanced rate/cycle capability.Combined with theoretical calculations,it is suggested that the superior electrochemical performances originate from the Zr-doped interphase structure,which has an enlarged Na layer spacing that forms favorable Na-ion diffusion channels.This work highlights a general material interface optimization method which opens a new perspective for fabricating high-performance elec-trodes for Na-ion batteries and beyond.

Na Li;Shaofei Wang;Enyue Zhao;Wen Yin;Zhigang Zhang;Kang Wu;Juping Xu;Yoshihiro Kuroiwa;Zhongbo Hu;Fangwei Wang;Jinkui Zhao;Xiaoling Xiao

College of Materials Science and Opto-electronic Technology,Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;Spallation Neutron Source Science Center,Dongguan 523803,Guangdong,China;Songshan Lake Materials Laboratory,Dongguan 523808,Guangdong,China;Department of Physical Science,Hiroshima University,Higashihiroshima,Hiroshima 739-8526,Japan;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

能源化学

[1]Na Li;Shaofei Wang;Enyue Zhao;Wen Yin;Zhigang Zhang;Kang Wu;Juping Xu;Yoshihiro Kuroiwa;Zhongbo Hu;Fangwei Wang;Jinkui Zhao;Xiaoling Xiao-.Tailoring interphase structure to enable high-rate,durable sodium-ion battery cathode)[J].能源化学,2022(05):564-571

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