Journal of the American Chemical Society· 2026Q1
Restraining O–O Dimerization for Highly Reversible Oxygen Redox in a Sodium-Ion Layered-Oxide Cathode
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- Q1SCImago
- 2026year
Short summary
A novel sodium-ion layered-oxide cathode (Na0.67Fe0.3Sc0.1Mn0.6O2) achieves highly reversible oxygen redox by inhibiting O–O dimerization via a π-type conjugated ring structure, delivering 192.3 mAh g–1 capacity with 80.5% retention after 200 cycles.
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Key points
- O–O dimerization, a cause of irreversibility in oxygen-redox cathodes, is inhibited by a π-type conjugated ring structure.
- Sc3+ introduction strengthens Fe t2g–O 2p hybridization, enabling asymmetric reductive coupling and reversible oxygen redox.
- The Na0.67Fe0.3Sc0.1Mn0.6O2 cathode delivers 192.3 mAh g–1 capacity with 80.5% retention after 200 cycles at 4.5 V.
- A pouch full cell achieves a high energy density of 254.3 Wh kg–1.
AI-generated from the title and abstract; the full text is not read.
Abstract
Abstract Activating the oxygen redox reaction in sodium-ion layered-oxide cathodes is a promising approach to elevate the energy density. However, oxygen-redox cathodes typically suffer from poor reversibility. O–O dimerization has been recognized as the underlying driver of irreversibility, but prevailing strategies have failed to fundamentally suppress it. Herein, O–O dimer formation was effectively inhibited through constructing a π-type conjugated ring within the Fe–O–Fe–O local structure. Such a unique ring architecture was achieved by introducing Sc3+ to strengthen Fe t2g–O 2p hybridization, thus enabling asymmetric Fe and O reductive coupling reactions and achieving highly reversible oxygen redox with significantly improved electrochemical kinetics. Consequently, Na0.67Fe0.3Sc0.1Mn0.6O2 delivers an impressive capacity of 192.3 mAh g–1 with 80.5% retention after 200 cycles at 4.5 V and maintains 82.2 mAh g–1 even at 10 C. The pouch full cell with a hard carbon anode exhibits a high energy density of 254.3 Wh kg–1. Restraining O–O dimerization establishes an insightful design principle for oxygen-loss-free layered-oxide cathodes.
The authors' abstract, as published at the source. Journal of the American Chemical Society, 2026 · DOI ↗
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Field: Electrical and Electronic Engineering
Electrical and Electronic EngineeringEngineering