Application of sodium powder with micro-nano structure in sodium metal solid-state battery

The preparation of micro/nano structured sodium powder by cryogenic ball milling solves the problem of poor contact between sodium metal and solid electrolyte in solid sodium metal batteries, improves the electrode/electrolyte interface contact, and enhances the cycle stability and safety of the battery.

CN122246115APending Publication Date: 2026-06-19XIAN TECH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN TECH UNIV
Filing Date
2026-02-09
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

In solid-state sodium metal batteries, poor contact and ion transport between sodium metal and solid electrolyte lead to voids at the interface, resulting in high interfacial impedance, uneven sodium ion transport, and the formation of an unstable SEI layer that induces dendrite growth, thus affecting battery performance and stability.

Method used

Sodium powder with micro-nano structures was prepared using cryogenic ball milling technology as a negative electrode. By cooling with low-temperature liquid nitrogen and high-energy ball milling, fine and well-dispersed sodium powder was prepared, which increased the contact area and nucleation sites between the sodium powder and the solid electrolyte, and improved the electrode/electrolyte interface contact.

Benefits of technology

It improves the cycle stability and safety of the battery, enhances the uniformity of sodium ion deposition, inhibits dendrite growth, and increases the battery's exchange current density and cycle life.

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Abstract

This invention belongs to the field of all-solid-state sodium metal battery preparation technology, specifically relating to the application of sodium powder with micro / nano structures in sodium metal solid-state batteries. Specifically, it involves preparing the sodium powder with micro / nano structures as the negative electrode sheet for a sodium metal solid-state battery. The preparation method of the sodium powder with micro / nano structures is as follows: Step 1, weigh 500 mg of metallic sodium and 2 mL of p-xylene, add grinding beads, and place in a cryogenic grinding jar; Step 2, place the cryogenic grinding jar in liquid nitrogen at -196°C for pre-freezing, then ball mill to prepare the sodium powder with micro / nano structures; Step 3, sieve to obtain the micro / nano sodium powder. This invention improves the electrode / electrolyte interface contact problem in sodium metal solid-state batteries by utilizing sodium powder with micro / nano structures, enhancing the cycle stability of the battery, and providing more uniform nucleation sites for sodium ions, suppressing sodium dendrite formation, thereby improving battery safety.
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