A room temperature alkali metal-sulfur or alkaline earth metal-sulfur flow battery and methods of making the same

By forming a positive electrode liquid in alkali metal-sulfur or alkaline earth metal-sulfur batteries to promote the dissolution of short-chain polysulfides, using a negative electrode liquid to avoid dendrite formation, and using specific separators and additives, the problems of battery cycle performance and safety hazards have been solved, and a high-efficiency room temperature charge-discharge and high-safety flow battery has been achieved.

CN122314971APending Publication Date: 2026-06-30SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
Filing Date
2024-12-31
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing alkali metal-sulfur or alkaline earth metal-sulfur batteries suffer from poor cycle performance and rate performance, severe self-discharge, significant safety hazards, poor conductivity and low utilization of sulfur cathodes, severe shuttle effect of intermediate polysulfides, and easy dendrite formation on the anode, which leads to difficulties in commercialization.

Method used

By forming a positive electrode solution to promote the dissolution of short-chain polysulfides and improve sulfur utilization, a negative electrode solution is used to avoid the formation of metal dendrites. A solid electrolyte or ion-selective permeable membrane is used as a separator to block the permeation of other substances. Adding solubilizing additives and conductive agents, and controlling the concentration of solvent and active material, ensures that the battery can operate at room temperature.

Benefits of technology

It improves the battery's charge and discharge capacity and coulombic efficiency, reduces the cost of the thermal management system, enhances the battery's safety performance, and achieves high energy density and excellent safety performance.

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Abstract

This invention relates to a room-temperature alkali metal-sulfur or alkaline earth metal-sulfur flow battery and its preparation method. The room-temperature alkali metal-sulfur or alkaline earth metal-sulfur flow battery includes a positive electrode region, a negative electrode region, and a separator. The positive electrode region includes a positive electrode liquid containing sulfur and an alkali metal or alkaline earth metal. The negative electrode region includes a negative electrode liquid containing a liquid alkali metal negative electrode. This invention, by forming a positive electrode liquid, promotes the dissolution of short-chain polysulfides generated during discharge, thereby improving sulfur utilization and maximizing the capacity of the positive electrode active material. By forming a negative electrode liquid, it avoids the formation of metal dendrites and ensures that the battery system can operate at room temperature, reducing the cost of the thermal management system. The flow battery prepared by this invention has high charge / discharge capacity and excellent safety performance.
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Citation Information

Patent Citations

  • Lithium-sulfur semi-flow battery

    CN110571500A

  • Liquid flow type sodium-sulfur battery

    CN112768791A