Nonaqueous secondary battery

• US 8,999,589 B2
• Filed: 12/13/2010
• Issued: 04/07/2015
• 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
• Primary Examiner(s): D'Aniello, Nicholas P
• Assistant Examiner(s): DIGNAN, MICHAEL L
• Application Number:
  US12/966,041
• Publication Number:
  US 20110183217A1
• Time in Patent Office: 1,576 Days
• Field of Search: 429209-246, 429/188, 429/189, 429301-347, 429199-207
• 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 a silane coupling agent, a coupling agent represented by General Formula (I), or 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,

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:

4. The nonaqueous secondary battery according to claim 1, wherein the nonaqueous electrolyte contains the fluorinated cyclic carbonate ester represented by General Formula (II) at a content of 0.3% by mass or more and 40% by mass or less with respect to the total mass of the nonaqueous electrolyte.

5. The nonaqueous secondary battery according to claim 1, wherein the fluorinated cyclic carbonate ester is FEC, cis-DFEC or trans-DFEC.

6. The nonaqueous secondary battery according to claim 5 wherein the fluorinated cyclic carbonate ester is FEC.

7. The nonaqueous secondary battery according to claim 1, wherein the coupling agent represented by General Formula (I) is one selected from the group consisting of aluminum bisethylacetoacetate monoacetylacetonate, aluminum ethylacetoacetate diisopropylate, aluminum triethilacetate, aluminum trisacetylacetonate, titanium bis(ethylacetoacetate), titanium bisethylacetoacetate bisacetylacetonate and zirconium tetrakisacetylacetonate.

8. The nonaqueous secondary battery according to claim 4, wherein the coupling agent represented by General Formula (I) is aluminum bisethylacetoacetate monoacetylacetonate.