Method of manufacturing lithium-ion secondary battery

Patent metadata

Field	Value
Publication number	US-9608293-B2
Application number	US-201414764752-A
Country	US
Kind code	B2
Filing date	Jan 15, 2014
Priority date	Feb 4, 2013
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A method of manufacturing a lithium-ion secondary battery proposed herein includes the following steps of: preparing a battery in which an electrode assembly is enclosed in a battery case; filling a first electrolyte solution containing a film forming agent into the battery case; charging and discharging the battery filled with the first electrolyte solution; discharging the first electrolyte solution from the battery that has been charged and discharged; and filling a second electrolyte solution containing a film forming agent at a concentration of less than 0.005 mol/L into the battery case from which the first electrolyte solution has been discharged.

First claim

The invention claimed is:

1. A method of manufacturing a lithium-ion secondary battery, comprising:
preparing a battery in which an electrode assembly is enclosed in a battery case;
filling a first electrolyte solution containing a film forming agent into the battery case;
charging and discharging the battery filled with the first electrolyte solution;
discharging the first electrolyte solution from the battery that has been charged and discharged; and
filling a second electrolyte solution containing the film forming agent at a concentration of less than 0.005 mol/L into the battery case from which the first electrolyte solution has been discharged.

2. The method of manufacturing a lithium-ion secondary battery according to claim 1 , wherein the second electrolyte solution is free of the film forming agent.

3. The method of manufacturing a lithium-ion secondary battery according to claim 1 , wherein the film forming agent is at least one additive agent selected from the group consisting of LiPF 2 (C 2 O 4 ) 2 , LiB(C 2 O 4 ) 2 , UPF 2 (C 3 O 4 ) 2 , and LiB(C 3 O 4 ) 2 .

Assignees

• Toyota Motor Co Ltd

Inventors

• Mitsuhashi Toshihiko

Classifications

• H01M50/609

  Arrangements or processes for filling with liquid, e.g. electrolytes · CPC title

• Y02P70/50

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

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/058 Primary

  Construction or manufacture · CPC title

• H01M10/446

  Initial charging measures · CPC title