Method of manufacturing nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-10186708-B2
Application number	US-201615280360-A
Country	US
Kind code	B2
Filing date	Sep 29, 2016
Priority date	Oct 5, 2015
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

A method of manufacturing a nonaqueous electrolyte secondary battery includes: a first step of preparing a positive electrode mixture paste; and a second step of preparing a positive electrode. In the first step, at least one binder including an acidic binder in an amount set such that a pH value of an aqueous solution obtained by dissolving the set amount of acidic binder in the same amount of water as that of the solvent is within a range of 1.7 to 5.5 is used.

First claim

What is claimed is:

1. A method of manufacturing a nonaqueous electrolyte secondary battery, the method comprising:
preparing a positive electrode mixture paste by kneading a positive electrode active material, a conductive material, a solvent, at least one binder, and lithium phosphate, the at least one binder including an acidic binder in an amount set such that a pH value of an aqueous solution obtained by dissolving the set amount of acidic binder in the same amount of water as that of the solvent is within a range of 1.7 to 5.5;
preparing a positive electrode including a positive electrode mixture layer formed on a surface of a current collector member by applying the positive electrode mixture paste to the surface of the current collector member and drying the positive electrode mixture paste;
constructing the nonaqueous electrolyte secondary battery by accommodating the positive electrode, a negative electrode, and a nonaqueous electrolytic solution containing a fluorine-containing compound in a battery case; and
charging the nonaqueous electrolyte secondary battery.

2. The method according to claim 1 , wherein when preparing the positive electrode mixture paste, the at least one binder includes a neutral binder.

3. The method according to claim 1 , wherein the acidic binder is polyacrylic acid.

4. The method according to claim 1 , wherein the positive electrode active material is a lithium nickel manganese oxide having a spinel structure.

5. The method according to claim 1 , wherein the lithium phosphate is Li 3 PO 4 .

6. The method according to claim 1 , wherein an amount of the acidic binder is 0.1 wt % to 0.3 wt % in a solid content of the positive electrode mixture paste.

Assignees

• Toyota Motor Co Ltd

Inventors

• Akiyama Naohisa
• Kitayoshi Masanori
• Miura Takashi
• Hori Yukiko
• Ueda Masashi

Classifications

• H01M10/0525

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

• H01M4/131

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

• H01M10/0569

  characterised by the solvents · CPC title

• H01M4/623

  fluorinated polymers · CPC title