Lithium secondary battery and manufacturing method of the same

Patent metadata

Field	Value
Publication number	US-2016293941-A1
Application number	US-201615082662-A
Country	US
Kind code	A1
Filing date	Mar 28, 2016
Priority date	Mar 31, 2015
Publication date	Oct 6, 2016
Grant date	—

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

• H01M4/587 Primary

  for inserting or intercalating light metals · CPC title

• H01M10/049

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

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/364 Primary

  as mixtures · CPC title

• Y02P70/50

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