Nonaqueous electrolyte secondary battery

• US 10,090,561 B2
• Filed: 10/16/2015
• Issued: 10/02/2018
• Est. Priority Date: 07/08/2013
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Chiga, Takanobu
• Primary Examiner(s): Slifka, Sarah A.
• Assistant Examiner(s): Lynch, Victoria H
• Application Number:
  US14/885,958
• Publication Number:
  US 20160043441A1
• Time in Patent Office: 1,082 Days
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0569 characterised by the solvents
• CPC Class Codes: H01M 10/058 Construction or manufacture
• CPC Class Codes: H01M 2300/0028 characterised by the solvent
• CPC Class Codes: H01M 2300/0034 Fluorinated solvents
• CPC Class Codes: H01M 2300/0037 Mixture of solvents
• CPC Class Codes: H01M 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 50/417 Polyolefins
• CPC Class Codes: H01M 50/434 Ceramics
• CPC Class Codes: H01M 50/451 comprising layers of only organic material and layers containing inorganic material
• CPC Class Codes: H01M 50/46 Separators, membranes or diaphragms characterised by their combination with electrodes
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

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-XF_X—CH₂—COO—CH₃ (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.

Claims

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-xF_x—

CH₂—

COO—

CH₃  

 

(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;

CF₃CH₂COOCH₃.

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.