Nonaqueous Electrolyte Secondary Battery

• US 20080193852A1
• Filed: 02/03/2006
• Published: 08/14/2008
• Est. Priority Date: 02/03/2006
• Status: Abandoned Application

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation), Sanyo GS Soft Energy Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Murai, Tetsuya
• Application Number:
  US11/883,577
• Publication Number:
  US 20080193852A1
• Time in Patent Office: Days
• US Class Current: 429/326
• 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 10/0567 characterised by the additives
• CPC Class Codes: H01M 10/0568 characterised by the solutes
• CPC Class Codes: H01M 10/4235 Safety or regulating additives or arrangements in electrodes, separators or electrolyte H01M10/4242 takes precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A nonaqueous electrolyte secondary battery has a positive electrode containing a lithium complex oxide, a negative electrode which adsorbs/desorbs lithium, and an electrolyte, and not less than 0.1% by mass and not more than 2% by mass of one or more kinds of compounds selected from LiFOB and LiBOB, or not less than 0.01% by mass and not more than 2% by mass of LiBF₄, and not less than 0.1% by mass and not more than 4% by mass of a aromatic compound, respectively relative to the total mass of the electrolyte, are added to the electrolyte in order to suppress decrease in the charge/discharge cycle life property and swelling of a battery when left in high temperature environments.

Claims

1-7. -7. (canceled)

8. A nonaqueous electrolyte secondary battery, comprising:

a positive electrode containing a complex oxide of the composition formula Li_xMO₂ or Li_yM₂O₄ (wherein, M represents one or more kinds of transition metals, 0≦

x≦

1, 0≦

y≦

2);

a negative electrode which adsorbs/desorbs lithium; and

an electrolyte, wherein

said electrolyte contains

one or more kinds of compounds selected from the group consisting of compounds of the formula (1) and compounds of the formula (2) in an amount of not less than 0.1% by mass and not more than 2% by mass relative to the total mass of the electrolyte,

and one or more kinds of compounds selected from the group consisting of biphenyl, cyclohexylbenzene, 2,4-difluoroanisole, 2-fluorobiphenyl, tertiary amylbenzene, toluene, ethylbenzene, 4-fluorodiphenyl ether and triphenyl phosphate in an amount of not less than 0.1% by mass and not more than 4% by mass relative to the total mass of the electrolyte,

9. The nonaqueous electrolyte secondary battery according to claim 8, wherein said electrolyte contains one or more kinds of compounds selected from the group consisting of vinylene carbonate, vinylethylene carbonate, phenylethylene carbonate and cyclic carboxylic anhydrides in an amount of not less than 0.1% by mass and not more than 2% by mass relative to the total mass of the electrolyte.

10. The nonaqueous electrolyte secondary battery according to claim 8, wherein said electrolyte contains LiBF₄.

11. A nonaqueous electrolyte secondary battery, comprising:

a positive electrode containing a complex oxide of the composition formula Li_xMO₂ or Li_yM₂O₄ (wherein, M represents one or more kinds of transition metals, 0≦

x≦

1, 0≦

y≦

2);

a negative electrode which adsorbs/desorbs lithium; and

an electrolyte, wherein

said electrolyte contains

LiBF₄ in an amount of not less than 0.01% by mass and not more than 2% by mass relative to the total mass of the electrolyte, and

one or more kinds of compounds selected from the group consisting of biphenyl, 2,4-difluoroanisole, 2-fluorobiphenyl, toluene, ethylbenzene, 4-fluorodiphenyl ether and triphenyl phosphate in an amount of not less than 0.1% by mass and not more than 4% by mass relative to the total mass of the electrolyte.

12. The nonaqueous electrolyte secondary battery according to claim 11, wherein said electrolyte contains one or more kinds of compounds selected from the group consisting of vinylene carbonate, vinylethylene carbonate, phenylethylene carbonate and cyclic carboxylic anhydrides in an amount of not less than 0.1% by mass and not more than 2% by mass relative to the total mass of the electrolyte.