A solid-state sodium-sulfur battery sulfur positive electrode material coordinated and regulated by spin polarization and electronic bridge, and a preparation method and application thereof
By constructing a Fe3C and MnO heterocrystalline nanocrystal structure in the sulfur cathode matrix material, the problem of poor electronic conductivity and ionic conductivity of sulfur cathode materials in low-temperature all-solid-state sodium-sulfur batteries was solved, achieving higher reversibility and cycle stability, and improving the overall performance of the battery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-02
- Publication Date
- 2026-07-17
AI Technical Summary
In low-temperature all-solid-state sodium-sulfur batteries, sulfur and its discharge product Na2S have poor electronic and ionic conductivity, resulting in insufficient interfacial reaction and increased polarization. During cycling, solid products such as Na2S accumulate to form an electrochemical isolation region, leading to increased interfacial impedance, capacity decay, and reduced energy efficiency.
In the sulfur cathode matrix material, Fe3C and MnO heterostructure nanocrystals are constructed to form a heterostructure interface. Through the synergistic regulation of spin polarization and electron bridge, the electron transport capability is enhanced. Furthermore, bifunctional catalytic centers of Fe3C and MnO heterostructure are constructed on the hollow nitrogen-doped carbon nanotube framework to promote the discharge reduction and charging oxidation reactions of the sulfur cathode.
It improves the reversibility and cycle stability of low-temperature solid-state sodium-sulfur batteries. By promoting electron transport and directional migration of catalytic centers through heterogeneous interfaces, it suppresses uneven deposition of Na2S, improves the reversibility and rate performance of sulfur conversion reactions, and enhances battery capacity retention and energy efficiency.
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