首页|Achieving structurally stable O3-type layered oxide cathodes through site-specific cation-anion co-substitution for sodium-ion batteries

Achieving structurally stable O3-type layered oxide cathodes through site-specific cation-anion co-substitution for sodium-ion batteries

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O3-type layered oxides have garnered great attention as cathode materials for sodium-ion batteries because of their abundant reserves and high theoretical capacity.However,challenges persist in the form of uncontrollable phase transitions and intricate Na+diffusion pathways during cycling,resulting in com-promised structural stability and reduced capacity over cycles.This study introduces a special approach employing site-specific Ca/F co-substitution within the layered structure of O3-NaNi0.5Mn0.5O2 to effec-tively address these issues.Herein,the strategically site-specific doping of Ca into Na sites and F into O sites not only expands the Na+diffusion pathways but also orchestrates a mild phase transition by sup-pressing the Na+/vacancy ordering and providing strong metal-oxygen bonding strength,respectively.The as-synthesized Na0.95Ca0.05Ni0.5Mn0.5O1.95F0.05(NNMO-CaF)exhibits a mild O3-O3+O'3 → P3 phase transition with minimized interlayer distance variation,leading to enhanced structural integrity and stability over extended cycles.As a result,NNMO-CaF delivers a high specific capacity of 119.5 mA h g-1 at a current density of 120 mA g-1 with a capacity retention of 87.1％after 100 cycles.This study presents a promising strategy to mitigate the challenges posed by multiple phase transitions and augment Na+diffusion kinetics,thus paving the way for high-performance layered cathode materials in sodium-ion batteries.

Sodium-ion batteriesO3-type layered oxidesSite-specific co-dopingPhase transition

Yihao Shen、Chen Cheng、Xiao Xia、Lei Wang、Xi Zhou、Pan Zeng、Jianrong Zeng、Liang Zhang

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Institute of Functional Nano & Soft Materials(FUNSOM),Soochow University,Suzhou 215123,Jiangsu,China

Institute for Advanced Study,School of Mechanical Engineering Chengdu University,Chengdu 610106,Sichuan,China

Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China

Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China

Jiangsu Key Laboratory of Advanced Negative Carbon Technologies,Soochow University,Suzhou 215123,Jiangsu,China

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Science and Technology Program of SuzhouNational Natural Science Foundation of ChinaCollaborative Innovation Center of Suzhou Nano Science & Technology111 projectSSRFSSRFBSRF

ST20230412275189beamlines 13SSW14B1W1B

2024

10.1016/j.jechem.2024.02.040

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.93(6)
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