Sodium-ion rechargeable battery

JP7873449B2Active Publication Date: 2026-06-12NIPPON ELECTRIC GLASS CO LTD +1
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
NIPPON ELECTRIC GLASS CO LTD
Filing Date
2022-11-22
Publication Date
2026-06-12

AI Technical Summary

Benefits of technology

【0019】 本発明によれば、高容量でありかつ安全性に優れたナトリウムイオン二次電池を提供することができる。

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Abstract

Provided is a sodium ion secondary battery that exhibits a high capacity and an excellent safety.　This sodium ion secondary battery characteristically comprises: a positive electrode that contains a positive electrode active material comprising a crystallized glass that contains crystals represented by the general formula NaxMyP2Oz (1 ≤ x ≤ 2.8, 0.95 ≤ y ≤ 1.6, 6.5 ≤ z ≤ 8, and M is at least one selection from Fe, Ni, Co, Mn, and Cr); a negative electrode that contains a negative electrode active material comprising hard carbon; and a nonaqueous electrolyte.
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Claims

1. General formula Na ｘ M ｙ P ２ O ｚ A positive electrode comprising a positive electrode active material made of crystallized glass containing crystals represented by (1 ≤ x ≤ 2.8, 0.95 ≤ y ≤ 1.6, 6.5 ≤ z ≤ 8, where M is at least one selected from Fe, Ni, Co, Mn, and Cr), A negative electrode containing a negative electrode active material made of hard carbon, and non-aqueous electrolyte, Equipped with, A sodium-ion secondary battery characterized in that the hard carbon is coated with a coating layer containing beta-alumina crystals or NASICON crystals.

2. The positive electrode active material is, ｘ MP ２ O ７ The sodium-ion secondary battery according to claim 1, characterized in that it is made of crystallized glass containing crystals represented by (1 ≤ x ≤ 2, where M is at least one selected from Fe, Ni, Co, Mn, and Cr).

3. The positive electrode active material is represented by the general formula Na ｘ FeP ２ O ７ The sodium ion secondary battery according to claim 1, characterized in that it comprises a crystallized glass containing a crystal represented by (1 ≦ x ≦ 2).

4. The sodium-ion secondary battery according to any one of claims 1 to 3, characterized in that the positive electrode active material is coated with a carbon material.

5. The sodium ion secondary battery according to any one of claims 1 to 3, characterized in that the positive electrode active material consists of secondary particles.

6. A sodium-ion secondary battery according to any one of claims 1 to 3, characterized in that the non-aqueous electrolyte comprises an organic electrolyte and / or a gel polymer electrolyte.

7. An electrical device characterized by using a sodium-ion secondary battery as described in any one of claims 1 to 3.