Method for forming a Li-ion battery cell comprising an LNMO cathode material

Patent metadata

Field	Value
Publication number	US-10749219-B2
Application number	US-201515303977-A
Country	US
Kind code	B2
Filing date	Apr 14, 2015
Priority date	Apr 17, 2014
Publication date	Aug 18, 2020
Grant date	Aug 18, 2020

Abstract

A process forms a Li-ion battery cell including an LNMO-based cathode material, an anode material, a separator and an electrolyte. The process successively includes charging the cell until the cell reaches a state of charge of 100%, storing the cell in the state of charge of 100% in an open circuit for a period of time of at least 48 hours, and removing gas generated during the charging and the storage.

First claim

The invention claimed is:

1. A process for forming a Li-ion battery cell comprising an LNMO-based cathode material comprising an active material of formula LiNi x Mn 2-x O 4 in which 0<x≤0.5, an anode material, a separator and an electrolyte, the process comprising the following successive steps:
charging a Li-ion battery cell having a charge of less than 100% until the Li-ion battery cell reaches a state of charge of 100%;
storing the Li-ion battery cell in the state of charge of 100% in an open circuit for a period of time of at least 48 hours; and
removing gas generated during the charging and the storing,
wherein, when a volume of the gas generated is below a threshold, the removing of the gas is followed by charging the Li-ion battery cell until the Li-ion battery cell reaches the state of charge of 100%, and then the Li-ion battery cell is discharged until it reaches a state of charge of between 20% and 50%.

2. The process as claimed in claim 1 , wherein the storing is carried out at room temperature.

3. The process as claimed in claim 1 , further comprising:
discharging the Li-ion battery cell until the Li-ion battery cell reaches a state of charge of between 10% and 0%; and
storing, after the discharging, the Li-ion battery cell in the state of charge of between 10% and 0% in an open circuit at room temperature.

4. The process as claimed in claim 1 , wherein the charging, the storing, and the removing are repeated at least a second time.

5. The process as claimed in claim 1 , wherein the period of time for the storing is at least equal to one week.

6. The process as claimed in claim 1 , wherein the period of time for the storing is at least equal to two weeks.

7. The process as claimed in claim 1 , wherein the period of time for the storing is at least equal to four weeks.

8. The process as claimed in claim 1 , further comprising:
measuring a volume of the gas generated during the storing.

9. The process as claimed in claim 1 , further comprising, prior to the charging:
activating the Li-ion battery cell by injecting the electrolyte into the Li-ion battery cell; and
impregnating the electrolyte in an open circuit for 48 hours at room temperature.

10. The process as claimed in claim 1 , wherein:
the storing is carried out at a temperature of between 15 and 45° C.; and
the period of time for the storing is less than or equal to two weeks.

Assignees

• Renault Sas

Inventors

• Phan Viet-Phong
• Daniel Lise
• Si Larbi Gregory

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M4/505 Primary

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/446 Primary

  Initial charging measures · CPC title