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Instruments / Technical Area	Publication Details	Published	Actions
B07-B1-Versatile Soft X-ray beamline: High Throughput ES1 B18-Core EXAFS	Anion vacancy regulated sodium/potassium intercalation in potassium prussian blue analog cathodes for hybrid sodium-ion batteries Runzhe Wei , Xingwu Zhai , Henry R. Tinker , Pan He , Charlie A. F. Nason , Yupei Han , Veronica Celorrio , Gopinathan Sankar , Min Zhou , Yang Xu Advanced Functional Materials DOI: 10.1002/adfm.202308227 Diamond Proposal Number(s): [29781, 29392] Open Access Show Abstract ▼ Abstract: Fe-based potassium Prussian blue analogs (K-PBAs) are commonly used as K-ion battery (KIB) cathodes. Interestingly, K-PBAs are appealing cathodes for Na-ion batteries (NIBs). In a hybrid NIB cell, where Na-ion is in the electrolyte and K-ion is in the PBA cathode, cation intercalation and electrochemical performance of the cathode can be significantly affected by [Fe(CN)6]4− anion vacancy. This work studies the effect of anion vacancy in K-PBAs on regulating K-ion/Na-ion intercalation mechanism in hybrid NIB cells, by comparing two K-PBA cathodes with different vacancy contents. The results demonstrate that introducing a level of anion vacancy can maximize the number of K-ion intercalation sites and enhance K-ion diffusion in the PBA framework. This facilitates K-ion intercalation and suppresses Na-ion intercalation, resulting in a K-ion-dominated and high-discharge-voltage ion storage process in the hybrid NIB cell. The K-PBA cathode with 20% anion vacancy delivers 128 mAh g−1 at 25 mA g−1 and 67 mAh g−1 at 1000 mA g−1, as well as retains 89% and 81% capacity after 100 and 300 cycles, respectively. It completely outperforms the counterpart with 7% anion vacancy, which exhibits increased Na-ion intercalation but overall deteriorated ion storage.	Sep 2023

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B07-B1-Versatile Soft X-ray beamline: High Throughput ES1
B18-Core EXAFS

Anion vacancy regulated sodium/potassium intercalation in potassium prussian blue analog cathodes for hybrid sodium-ion batteries

Runzhe Wei , Xingwu Zhai , Henry R. Tinker , Pan He , Charlie A. F. Nason , Yupei Han , Veronica Celorrio , Gopinathan Sankar , Min Zhou , Yang Xu

Advanced Functional Materials

DOI: 10.1002/adfm.202308227

Diamond Proposal Number(s): [29781, 29392]