Production method for lithium-ion secondary battery

Patent metadata

Field	Value
Publication number	US-10944125-B2
Application number	US-201715709066-A
Country	US
Kind code	B2
Filing date	Sep 19, 2017
Priority date	Oct 17, 2016
Publication date	Mar 9, 2021
Grant date	Mar 9, 2021

Abstract

A production method for a lithium-ion secondary battery includes configuring an electrode group provided with a positive electrode and a negative electrode, storing the electrode group, electrolytic solution, and a third electrode in a housing, charging the negative electrode by performing charging between the third electrode and the negative electrode inside the housing, and discharging the charged negative electrode by performing discharging between the third electrode and the negative electrode, thereby producing the lithium-ion secondary battery.

First claim

What is claimed is:

1. A production method for a lithium-ion secondary battery comprising:
assembling a wound electrode group provided with a positive electrode and a negative electrode, wherein the positive electrode faces the negative electrode in the electrode group, the negative electrode is provided with a non-facing region that does not face the positive electrode, and the non-facing region is on an outermost periphery of the wound electrode group;
storing the electrode group, an electrolytic solution, and a third electrode in a housing, wherein the third electrode is a lithium-ion supplying electrode, and the third electrode is arranged so as to face the non-facing region of the negative electrode;
charging the negative electrode by performing charging between the third electrode and the negative electrode inside the housing, thereby forming a film in the non-facing region of the negative electrode during the production method; and
discharging the charged negative electrode by performing discharging between the third electrode and the negative electrode, wherein
during the production method, the charging and discharging do not include supplying power from outside of the lithium-ion secondary battery to the third electrode, and
the positive electrode and the negative electrode are configured to perform charging and discharging of the lithium-ion secondary battery.

2. The production method for the lithium-ion secondary battery according to claim 1 , wherein
the positive electrode has a first charge and discharge capacity per unit area,
the third electrode has a second charge and discharge capacity per unit area, and
the second charge and discharge capacity per unit area is at least twice as large as the first charge and discharge capacity per unit area.

3. The production method for the lithium-ion secondary battery according to claim 1 , wherein
a current rate, with which a state of charge of the lithium-ion secondary battery reaches 100% from 0% in an hour-long charging, is defined as 1 C, the negative electrode is charged with a current rate of 1 C or larger but not exceeding 2 C, and the negative electrode is discharged with a current rate of 1 C or larger but not exceeding 2 C.

4. The production method for the lithium-ion secondary battery according to claim 1 , wherein,
in the lithium-ion secondary battery, a capacity equivalent to a state of charge of 40% or larger but not exceeding 60% is charged in the negative electrode.

5. The production method for the lithium-ion secondary battery according to claim 1 , wherein lithium ions are supplied from the third electrode to the non-facing region of the negative electrode, and lithium ions are supplied from the negative electrode to the positive electrode.

6. A production method for a lithium-ion secondary battery comprising:
assembling a wound electrode group provided with a positive electrode and a negative electrode, wherein the positive electrode faces the negative electrode in the electrode group, the negative electrode is provided with a non-facing region that does not face the positive electrode, and the non-facing region is on an outermost periphery of the wound electrode group;
storing the electrode group, an electrolytic solution, and a third electrode in a housing, wherein the third electrode is a lithium-ion supplying electrode, and the third electrode is arranged so as to face the non-facing region of the negative electrode;
performing charging between the positive electrode and the negative electrode; and
electrically connecting the positive electrode and the third electrode to begin recovery processing and generate a potential difference between the positive electrode and the third electrode, thereby forming a film in the non-facing region of the negative electrode during the production method, wherein
during the production method, the recovery processing does not include supplying power from outside of the lithium-ion secondary battery to the third electrode, and
the positive electrode and the negative electrode are configured to perform charging and discharging of the lithium-ion secondary battery.

7. The production method for the lithium-ion secondary battery according to claim 6 , wherein the electrically connecting the positive electrode and the third electrode occurs after a capacity of the lithium-ion secondary battery has been reduced.

8. The production method for the lithium-ion secondary battery according to claim 6 , wherein during the recovery processing lithium ions are supplied from the third electrode to the non-facing region of the negative electrode, and lithium ions are supplied from the negative electrode to the positive electrode.

Assignees

• Toyota Motor Co Ltd

Inventors

• Nagaya Katsuhiko
• Okayama Shinobu
• Kikuchi Kyoko

Classifications

• Y02P70/50

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

• H01M10/44

  Methods for charging or discharging (circuits for charging H02J7/00) · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M10/049 Primary

  Processes for forming or storing electrodes in the battery container · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title