Sodium solid state electrochemical cells with improved stability

Novel anolytes and catholytes in sodium solid state batteries improve cycle stability and energy density, overcoming limitations in existing NaSSBs for large-scale energy storage applications.

WO2025212790A1 Publication Date: 2025-10-09PRESIDENT & FELLOWS OF HARVARD COLLEGE
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Patent Information

Application Number
PCT/US2025/022770
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-04-02
Filing Date
2025-04-02
Publication Date
2025-10-09

AI Technical Summary

Technical Problem

Sodium solid state batteries (NaSSBs) face challenges due to limited electrolyte and electrode materials, leading to poor cycle stability, low energy density, and safety risks from Na dendrite propagation, which hinder their development for large-scale energy storage.

Method used

The use of novel anolytes and catholytes, such as Na3.xPS4.xFx, Na2-a+bAlaYbZn-a-bCl6-2a, and oxygen-doped variants, along with anodes like NaxSn, enhances sodium ion conductivity, mechanical formability, and electrochemical stability, enabling high-rate cycling and increased energy and power densities.

Benefits of technology

These materials enable NaSSBs to cycle over 1000 cycles with improved energy and power densities, addressing the limitations of existing NaSSBs and enhancing their suitability for large-scale energy storage.

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Abstract

The invention provides an anolyte, catholytes, anodes, and cathodes for improved sodium solid state batteries that contain the aforementioned components and a separator between the anode and cathode. Sodium solid state electrochemical cells containing these components are shown to improve battery performance, e.g., improved sodium ion conductivity, increased cycle stability, and higher power density.
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