Lowering Sodium-Storage Lattice Strains of Layered Oxide Cathodes by Pushing Charge Transfer on Anions
Na Li , Wen Yin , Baotian Wang , Fangwei Wang , Xiaoling Xiao , Jinkui Zhao , Enyue Zhao
Energy & Environmental Materials ›› 2024, Vol. 7 ›› Issue (4) : e12671
Lowering Sodium-Storage Lattice Strains of Layered Oxide Cathodes by Pushing Charge Transfer on Anions
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.
anionic redox reaction / lattice strains / layered oxide cathodes / phase transitions / sodium-ion battery
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2023 The Authors. Energy & Environmental Materials published by John Wiley & Sons Australia, Ltd on behalf of Zhengzhou University.
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