Reversible structural evolution of sodium-rich rhombohedral Prussian blue for sodium-ion batteries

被引:0
作者
Wanlin Wang
Yong Gang
Zhe Hu
Zichao Yan
Weijie Li
Yongcheng Li
Qin-Fen Gu
Zhixing Wang
Shu-Lei Chou
Hua-Kun Liu
Shi-Xue Dou
机构
[1] University of Wollongong,Institute for Superconducting and Electronic Materials
[2] Innovation Campus,Institute for Computational Materials Science, School of Physics and Electronics
[3] Squires Way,School of Metallurgy and Environment
[4] Liaoning Starry Sky Sodium-ion Battery Co.,undefined
[5] Ltd.,undefined
[6] Laser industrial park,undefined
[7] High-tech district,undefined
[8] Australian Synchrotron (ANSTO),undefined
[9] 800 Blackburn Road,undefined
[10] Henan University,undefined
[11] Central South University,undefined
来源
Nature Communications | / 11卷
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摘要
Iron-based Prussian blue analogs are promising low-cost and easily prepared cathode materials for sodium-ion batteries. Their materials quality and electrochemical performance are heavily reliant on the precipitation process. Here we report a controllable precipitation method to synthesize high-performance Prussian blue for sodium-ion storage. Characterization of the nucleation and evolution processes of the highly crystalline Prussian blue microcubes reveals a rhombohedral structure that exhibits high initial Coulombic efficiency, excellent rate performance, and cycling properties. The phase transitions in the as-obtained material are investigated by synchrotron in situ powder X-ray diffraction, which shows highly reversible structural transformations between rhombohedral, cubic, and tetragonal structures upon sodium-ion (de)intercalations. Moreover, the Prussian blue material from a large-scale synthesis process shows stable cycling performance in a pouch full cell over 1000 times. We believe that this work could pave the way for the real application of Prussian blue materials in sodium-ion batteries.
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