首页|Surface encapsulation of layered oxide cathode material with NiTiO3 for enhanced cycling stability of Na-ion batteries

Surface encapsulation of layered oxide cathode material with NiTiO3 for enhanced cycling stability of Na-ion batteries

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In Na-ion batteries,O3-type layered oxide cathode materials encounter challenges such as particle cracking,oxy-gen loss,electrolyte side reactions,and multi-phase transitions during the charge/discharge process.This study focuses on surface coating with NiTiO3 achieved via secondary heat treatment using a coating precursor and the surface material.Through in-situ x-ray diffraction(XRD)and differential electrochemical mass spectrometry(DEMS),along with crystal structure characterizations of post-cycling materials,it was determined that the NiTiO3 coating layer facilitates the forma-tion of a stable lattice structure,effectively inhibiting lattice oxygen loss and reducing side reaction with the electrolyte.This enhancement in cycling stability was evidenced by a capacity retention of approximately 74％over 300 cycles at 1 C,marking a significant 30％improvement over the initial sample.Furthermore,notable advancements in rate performance were observed.Experimental results indicate that a stable and robust surface structure substantially enhances the overall stability of the bulk phase,presenting a novel approach for designing layered oxide cathodes with higher energy density.

Na-ion batterylayered oxideshigh voltagesurface coating

胡紫霖、唐彬、林挺、张楚、牛耀申、刘渊、高立克、谢飞、容晓晖、陆雅翔、胡勇胜

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Key Laboratory for Renewable Energy,Beijing Key Laboratory for New Energy Materials and Devices,Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

College of Materials Science and Optoelectronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China

Yangtze River Delta Physics Research Center Co.Ltd,Liyang 213300,China

Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100049,China

Guangxi Power Grid Co.Ltd.,Nanning 530023,China

Huairou Division,Institute of Physics,Chinese Academy of Sciences,Beijing 101400,China

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National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaYouth Innovation Promotion Association of the Chinese Academy of SciencesJiangsu Province Carbon Peak and Neutrality Innovation Program(Industry tackling on prospect and key technology)Guangxi Power Grid Project

2022YFB24025005212221492372116523941742020006BE2022002-5GXKJXM20210260

2024

10.1088/1674-1056/ad50c2

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(8)