What question did this study set out to answer?

To identify the degradation mechanisms of NaNi0.33Fe0.33Mn0.33O2 (NFM) cathodes and develop a method to prevent iron migration while stabilizing high-voltage oxygen redox reactions.

December 17, 2025Journal of the American Chemical Society

Suppressing Fe Migration for Highly Reversible Oxygen Redox of Sodium-Ion Layered Oxide Cathode

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To identify the degradation mechanisms of NaNi0.33Fe0.33Mn0.33O2 (NFM) cathodes and develop a method to prevent iron migration while stabilizing high-voltage oxygen redox reactions.
Incorporated calcium (Ca) and tin (Sn) into the NaNi0.33Fe0.33Mn0.33O2 cathode lattice to relieve structural distortions and suppress Fe3+ movement.
Tested electrochemical capacity, thermal tolerance at 50 °C, and cycling durability up to 4.5 V in full pouch cell configurations over 2000 cycles.
Ca and Sn co-doping mitigated the OP2 phase, reduced NiO6/FeO6 Jahn–Teller distortions, and prevented out-of-plane Fe migration and undercoordinated oxygen formation.
The modified NFM cathode demonstrated a specific capacity of 158.3 mAh g–1 under harsh operational conditions (4.5 V cut-off voltage at 50 °C).
Pouch cells assembled with the optimized cathode demonstrated exceptional cycling stability, exhibiting a capacity retention of 80.7% after 2000 cycles.

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Implication

Experimental study demonstrates enhanced stability and reversible oxygen redox in sodium-ion cathodes, indicating a viable design strategy for long-life batteries.

Cite This Study

Zhang et al. (2025) studied this question.

synapsesocial.com/papers/6a7d3226ab1caed3bf74972a https://doi.org/10.1021/jacs.5c15943

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Implication

Experimental study demonstrates enhanced stability and reversible oxygen redox in sodium-ion cathodes, indicating a viable design strategy for long-life batteries.

Suppressing Fe Migration for Highly Reversible Oxygen Redox of Sodium-Ion Layered Oxide Cathode

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Discussion

Implication

Cite This Study

Suppressing Fe Migration for Highly Reversible Oxygen Redox of Sodium-Ion Layered Oxide Cathode

Key Points

Discussion

Implication

Cite This Study

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