Iron sodium hydroxysulphide compound, process for preparing such a compound, active material comprising such a compound and electrochemical electrode produced of such an active material

Patent metadata

Field	Value
Publication number	US-12573627-B2
Application number	US-202218696538-A
Country	US
Kind code	B2
Filing date	Sep 21, 2022
Priority date	Sep 30, 2021
Publication date	Mar 10, 2026
Grant date	Mar 10, 2026

Abstract

A process for preparing a compound of formula (NaOH) x [Fe(OH) 2 ] y FeS, may include: (a) mixing iron and sodium sulfide in equimolar amounts, in an NaOH aqueous solution; (b) heating the obtained mixture up to a temperature in a range of from 110 to 210° C. for a duration in a range of from 1 hour to 1 week; and (c) recovering the active material by filtering and drying in a neutral atmosphere.

First claim

The invention claimed is:

1 . A negative electrode configured for a sodium-ion battery, the negative electrode comprising:
a compound obtained from a process for preparing a compound of formula (NaOH) x [Fe(OH) 2 ] y FeS, x and y varying in a range of from 0 excluded to 1, the process comprising: (a) mixing iron and sodium sulfide in equimolar amounts, in an NaOH aqueous solution, to obtain a mixture (b) heating the mixture up to a temperature in a range of from 110° C. and 210° C. for a duration in a range of from 1 hour to 1 week, to obtain an active material, and (c) recovering the active material by filtering and drying in a neutral atmosphere.

2 . The negative electrode of claim 1 , wherein the active material is present in a range of from 50 to 97% by weight, relative to the total negative electrode weight.

3 . The negative electrode of claim 1 , further comprising:
an additional conductive compound.

4 . The negative electrode of claim 3 , wherein the additional conductive compound comprises a metal particle and/or carbon.

5 . The negative electrode of claim 4 , comprising the carbon as graphite, carbon black, carbon fibers, carbon nanowires, carbon nanotubes, carbon nanospheres.

6 . The negative electrode of claim 4 , comprising the carbon as carbon black.

7 . The negative electrode of claim 3 , comprising the additional conductive compound in a range of from 3 to 50% by weight, preferably from 3% to 20% by weight, relative to the total negative electrode weight.

8 . The negative electrode of claim 3 , wherein the additional conductive compound comprises carbon.

9 . The negative electrode of claim 3 , comprising the additional conductive compound in a range of from 3 to 20% by weight, relative to total negative electrode weight.

10 . The negative electrode of claim 1 , wherein the active material is present in 97% by weight, relative to total negative electrode weight.

11 . A sodium ion battery, comprising:
the negative electrode of claim 1 .

Assignees

• Ampere Sas
• Centre Nat Rech Scient
• Ecole Nat Superieure De Chimie De Paris

Inventors

• Barboux Philippe
• Chakir Mohamed
• Giaume Domitille
• Haugland-Gosling Ine
• Mir Caroline

Classifications

• H01B1/10

  sulfides · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/054

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title