Method for dissolving a positive electrode material

Patent metadata

Field	Value
Publication number	US-2024183005-A1
Application number	US-202218553250-A
Country	US
Kind code	A1
Filing date	Mar 28, 2022
Priority date	Mar 30, 2021
Publication date	Jun 6, 2024
Grant date	—

Abstract

A method for dissolving a positive electrode material of a battery including a step during which the positive electrode material, comprising lithium and optionally cobalt and/or nickel, is submerged in an acid solution having a pH between 0 and 4, the acid solution containing either manganese ions or hydrogen peroxide, by means of which the lithium and optionally the cobalt and/or nickel is dissolved, and the manganese ions are selectively precipitated in the form of manganese oxyhydroxide.

First claim

What is claimed is:

1 . A method for dissolving a positive electrode material of a battery comprising a step during which the positive electrode material, including lithium, manganese and possibly cobalt and/or nickel, is immersed in an acid solution at a pH comprised between 0 and 4,
wherein the acid solution contains hydrogen peroxide, whereby, on the one hand, the lithium and possibly the cobalt and/or the nickel are put into solution and, on the other hand, the manganese is dissolved, which selectively precipitates in the form of a manganese oxyhydroxide.

2 . The method according to claim 1 , wherein the manganese of the positive electrode material is entirely recovered in the form of manganese oxohydroxide.

3 . The method according to claim 1 , wherein the duration of the leaching step is between 1 h and 24 h.

4 . The method according to claim 1 , wherein the volume concentration of hydrogen peroxide is between 1% and 12%, and preferably between 1% and 6%.

5 . The method according to claim 4 , wherein the volume concentration of hydrogen peroxide is between 1% and 4%.

6 . The method according to claim 5 , wherein the volume concentration of hydrogen peroxide is between 2% and 3%.

7 . The method according to claim 1 , wherein the pH is between 1 and 2.5.

8 . The method according claim 1 , wherein the solid/liquid ratio is between 5% and 40%, and advantageously between 5% and 20%.

9 . The method according to claim 1 , wherein the ratio between the volume concentration of hydrogen peroxide and the solid/liquid ratio is between 0.1 and 0.4 and preferably between 0.2 and 0.3.

10 . The method according to claim 1 , wherein the positive electrode is an NMC electrode.

11 . The method according to claim 1 , wherein the temperature of the solution is between 70° C. and 100° C., preferably between 80° C. and 95° C.

12 . The method according to claim 1 , wherein the positive electrode material is in a particulate form.

13 . The method according to claim 1 , wherein the solid/liquid ratio is between 5% and 40% and the volume concentration of hydrogen peroxide is between 1% and 12%.

14 . The method according to claim 13 , wherein the solid/liquid ratio is comprised between 5% and 20% and the volume concentration of hydrogen peroxide is between 1% and 6%.

15 . The method according to claim 1 , wherein the solid/liquid ratio is between 5% and 10%, the pH is comprised between 1 and 2.5 and the volume concentration of hydrogen peroxide is between 1% and 3%.

Assignees

• Commissariat Energie Atomique
• Orano

Inventors

• Billy Emmanuel

Classifications

• C22B47/00 Primary

  Obtaining manganese · CPC title

• C01G45/02

  Oxides · CPC title

• C22B3/08 Primary

  Sulfuric acid {, other sulfurated acids or salts thereof} · CPC title

• C22B3/22

  by physical processes, e.g. by filtration, by magnetic means {, or by thermal decomposition} (treatment or purification of solutions by liquid-liquid extraction C22B3/26) · CPC title

• C22B3/44

  by chemical processes (treatment or purification of solutions by liquid-liquid extraction C22B3/26, by ion-exchange extraction C22B3/42) · CPC title