Lithium secondary battery and manufacturing method of the same

Patent metadata

Field	Value
Publication number	US-9876229-B2
Application number	US-201615082662-A
Country	US
Kind code	B2
Filing date	Mar 28, 2016
Priority date	Mar 31, 2015
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

A manufacturing method of the invention includes: a process of preparing a positive electrode which includes a positive electrode mixture layer, a negative electrode which includes a negative electrode mixture layer, and a non-aqueous electrolyte; and a process of accommodating the positive electrode, the negative electrode, and the non-aqueous electrolyte in a battery case. The non-aqueous electrolyte contains lithium sulfate. In addition, when a BET specific surface area of the negative electrode mixture layer is referred to as X (m 2 /g) and an addition amount of the lithium sulfate with respect to a total amount of the non-aqueous electrolyte is referred to as Y (mass %), the following relationships are satisfied:

3≦X≦4.3;

0.02≦Y≦0.1; and

Y/X ≦0.023.

First claim

What is claimed is:

1. A manufacturing method of a lithium secondary battery comprising:
a process of preparing a positive electrode which includes a positive electrode mixture layer, a negative electrode which includes a negative electrode mixture layer, and a non-aqueous electrolyte; and
a process of accommodating the positive electrode, the negative electrode, and the non-aqueous electrolyte in a battery case,
wherein the non-aqueous electrolyte contains lithium sulfate, and when a BET specific surface area of the negative electrode mixture layer is referred to as X m 2 /g and an addition amount of the lithium sulfate with respect to a total amount of the non-aqueous electrolyte is referred to as Y mass %, the following relationships are satisfied:
3≦X≦4.3;

0.02≦Y≦0.1; and

Y/X≦ 0.023.

2. The manufacturing method according to claim 1 , wherein
the negative electrode mixture layer includes a negative electrode active material, and the negative electrode active material is graphite.

3. A lithium secondary battery comprising:
a positive electrode which includes a positive electrode mixture layer;
a negative electrode which includes a negative electrode mixture layer;
a battery case which accommodates the positive electrode and the negative electrode; and
a non-aqueous electrolyte which is accommodated in the battery case,
wherein the non-aqueous electrolyte contains lithium sulfate, and
when a BET specific surface area of the negative electrode mixture layer is referred to as X m 2 /g and an addition amount of the lithium sulfate with respect to a total amount of the non-aqueous electrolyte accommodated in the battery case is referred to as Y mass %, the following relationships are satisfied:
3≦X≦4.3;

0.02≦Y≦0.1; and

Y/X≦ 0.023.

4. The lithium secondary battery according to claim 3 , wherein
the negative electrode mixture layer includes a negative electrode active material, and the negative electrode active material is graphite.

Assignees

• Toyota Motor Co Ltd

Inventors

• Yamasaki Hiroshi
• Hashimoto Tatsuya

Classifications

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title