Lowering Sodium-Storage Lattice Strains of Layered Oxide Cathodes by Pushing Charge Transfer on Anions

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外文摘要：Due to a high energy density,layered transition-metal oxides have gained much attention as the promising sodium-ion batteries cathodes.However,they readily suffer from multiple phase transitions during the Na extraction process,resulting in large lattice strains which are the origin of cycled-structure degradations.Here,we demonstrate that the Na-storage lattice strains of layered oxides can be reduced by pushing charge transfer on anions(O2).Specifically,the designed O3-type Ru-based model compound,which shows an increased charge transfer on anions,displays retarded O3-P3-O1 multiple phase transitions and obviously reduced lattice strains upon cycling as directly revealed by a combination of ex situ X-ray absorption spectroscopy,in situ X-ray diffraction and geometric phase analysis.Meanwhile,the stable Na-storage lattice structure leads to a superior cycling stability with an excellent capacity retention of 84％and ultralow voltage decay of 0.2 mV/cycle after 300 cycles.More broadly,our work highlights an intrinsically structure-regulation strategy to enable a stable cycling structure of layered oxides meanwhile increasing the materials'redox activity and Na-diffusion kinetics.

外文关键词：

anionic redox reactionlattice strainslayered oxide cathodesphase transitionssodium-ion battery

作者：

Na Li、Wen Yin、Baotian Wang、Fangwei Wang、Xiaoling Xiao、Jinkui Zhao、Enyue Zhao

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作者单位：

Songshan Lake Materials Laboratory,Dongguan 523808,China

Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

Spallation Neutron Source Science Center,Dongguan 523803,China

Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China

College of Materials Science and Opto-electronic Technology,Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences,Beijing 100049,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaGuangdong Basic and Applied Basic Research Foundationopen research fund of Songshan Lake Materials LaboratoryLarge Scientific Facility Open Subject of Songshan Lake,Dongguan,Guangdong

项目编号：

12105197520881012022A15150103192022SLABFK04

出版年：

2024

DOI：

10.1002/eem2.12671

能源与环境材料(英文)

ISSN：

年,卷(期)：2024.7(4)