Nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-10090561-B2
Application number	US-201514885958-A
Country	US
Kind code	B2
Filing date	Oct 16, 2015
Priority date	Jul 8, 2013
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

In a nonaqueous electrolyte secondary battery including a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, a nonaqueous electrolyte containing a lithium salt in a nonaqueous solvent, and a separator disposed between the positive electrode and the negative electrode, an inorganic particle layer is disposed between the positive electrode and the separator, and the nonaqueous solvent contains a chain fluorinated carboxylate ester represented by the formula CH 3-X F X —CH 2 —COO—CH 3 (where, x is an integer of 1 to 3) in an amount of 15% by volume or more based on the total amount of the nonaqueous solvent.

First claim

What is claimed is:

1. A nonaqueous electrolyte secondary battery comprising:
a positive electrode containing a positive electrode active material;
a negative electrode containing a negative electrode active material;
a nonaqueous electrolyte of a nonaqueous solvent mainly composed of a fluorine-based solvent and containing a lithium salt; and
a separator disposed between the positive electrode and the negative electrode, wherein
an inorganic particle layer is disposed between the positive electrode and the separator and arranged to prevent the positive electrode and the separator from being in direct contact with each other,
the nonaqueous solvent contains a chain fluorinated carboxylate ester represented by Formula (1) in an amount of 15% by volume or more based on the total amount of the nonaqueous solvent,
CH 3-x F x —CH 2 —COO—CH 3   (1)

where, x is an integer of 1 to 3,
the nonaqueous solvent further contains 4-fluoroethylene carbonate (FEC), and
the chain fluorinated carboxylate ester includes methyl 3,3,3-trifluoropropionate (FMP) represented by a chemical formula: CF 3 CH 2 COOCH 3 .

2. The nonaqueous electrolyte secondary battery according to claim 1 , wherein a content of the chain fluorinated carboxylate ester is 15% by volume or more and 85% by volume or less based on the total amount of the nonaqueous solvent.

3. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the inorganic particle layer contains at least one of alumina, rutile titania, and boehmite.

4. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the inorganic particle layer is formed on the surface of the positive electrode.

Assignees

• Panasonic Corp

Inventors

• Chiga Takanobu

Classifications

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title

• H01M50/417

  Polyolefins · CPC title

• H01M50/434

  Ceramics · CPC title

• H01M2/1646

  Electricity · mapped topic

• H01M2/1653

  Electricity · mapped topic