NONAQUEOUS SECONDARY BATTERY

• US 20110183217A1
• Filed: 12/13/2010
• Published: 07/28/2011
• Est. Priority Date: 01/27/2010
• Status: Active Grant

• Current Assignee: Panasonic Energy Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Takahashi, Kentaro
• Granted Patent: US 8,999,589 B2
• Time in Patent Office: Days
• US Class Current: 429/338
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0567 characterised by the additives
• CPC Class Codes: H01M 10/4235 Safety or regulating additives or arrangements in electrodes, separators or electrolyte H01M10/4242 takes precedence
• CPC Class Codes: H01M 2300/0025 Organic electrolyte
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: H01M 4/621 Binders
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A positive electrode active material has an average particle diameter of 4.5 to 15.5 μm and a specific surface area of 0.13 to 0.80 m²/g. A positive electrode mixture layer contains a silane coupling agent and/or at least one of aluminum, titanium, or zirconium based coupling agent having an alkyl or alkoxy groups having 1 to 18 carbon atoms at a content of 0.003% by mass or more and 5% by mass or less with respect to the mass of the positive electrode active material. The nonaqueous electrolyte contains a fluorinated cyclic carbonate esters at a content of 0.3% by mass or more with respect to the total mass of the nonaqueous electrolyte. Thus the nonaqueous secondary battery in which, when used with a nonaqueous electrolyte containing a fluorinated cyclic carbonate esters, cycle characteristics are good and nail penetration characteristics are superior is provided.

Claims

1. A nonaqueous secondary battery comprising:

a positive electrode plate formed with a positive electrode mixture layer having a lithium composite oxide as a positive electrode active material;

a negative electrode plate;

a separator; and

a nonaqueous electrolyte, the positive electrode active material having an average particle

diameter of 4.5 to 15.5 μ

m and a specific surface area of 0.13 to 0.80 m²/g, the positive electrode mixture layer containing at least one of a silane coupling agent and a coupling agent represented by General Formula (I) at a content of 0.003% by mass or more and 5% by mass or less with respect to the mass of the positive electrode active material, and

the nonaqueous electrolyte containing a fluorinated cyclic carbonate esters represented by General Formula (II) at a content of 0.3% by mass or more with respect to the total mass of the nonaqueous electrolyte;

2. The nonaqueous secondary battery according to claim 1, wherein the positive electrode mixture layer contains a coupling agent represented by General Formula (I), where M is Al:

3. The nonaqueous secondary battery according to claim 1, wherein the positive electrode mixture layer contains a coupling agent represented by General Formula (I), where at least one of R1 and R2 is an alkoxy group: