Non-aqueous electrolyte secondary battery

• US 5,709,968 A
• Filed: 05/24/1996
• Issued: 01/20/1998
• Est. Priority Date: 05/26/1995
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Shimizu, Ryuichi
• Primary Examiner(s): KALAFUT, STEPHEN J
• Application Number:
  US08/653,457
• Time in Patent Office: 606 Days
• Field of Search: 429/198, 429/61, 429/62, 429/248
• US Class Current: 429/324
• 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 2200/00 Safety devices for primary or secondary batteries
• CPC Class Codes: H01M 6/164 by the solvent
• CPC Class Codes: H01M 6/168 by additives
• CPC Class Codes: H01Q 1/242 specially adapted for hand-held use
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 1/3291 mounted in or on other locations inside the vehicle or vehicle body
• CPC Class Codes: H04B 1/3877 Arrangements for enabling portable transceivers to be used in a fixed position, e.g. cradles or boosters
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A non-aqueous electrolyte secondary battery capable of quickly interrupting overcharge current and overcharge reactions even if overcharged during charge with a great electric current so that thermal runaway occurring due to overcharge current is prevented. A benzene compound, into which a predetermined substitutional group has been induced, is added to the non-aqueous electrolyte of the non-aqueous electrolyte secondary battery.

Claims

1. A non-aqueous electrolyte secondary battery comprising:

a negative pole made of metal material mainly composed of lithium or carbon material capable doping and removing lithium;

a positive pole made of a composite oxide of lithium and transition metal; and

electrolyte which is non-aqueous electrolyte in which a support salt is dissolved in non-aqueous solvent, wherein

the non-aqueous electrolyte contains a benzene compound having a reversible oxidation-reduction potential at a potential higher than a positive pole potential in a state where said non-aqueous electrolyte secondary battery is fully charged and having p-electron orbital, and the benzene compound is selected from the group consisting of a compound expressed by General Formulas I! to V!;

##STR22## where R is an alkyl group, A₁, A₂, A₃, A₄ and A₅ are each H or halogen and at least one of A₁, A₂, A₃, A₄ and A₅ is halogen;

##STR23## where R is an alkyl group, A₁, A₂, A₃ and A₄ are each H or halogen and at least any one of A₁, A₂, A₃ and A₄ is halogen;

##STR24## where R is an alkyl group, A₁, A₂, A₃ and A₄ are each H or halogen and at least any one of A₁, A₂, A₃ and A₄ is halogen;

##STR25## where R is an alkyl group, A₁, A₂ and A₃ are each H or halogen and at least any one of A₁, A₂ and A₃ is halogen;

##STR26## where R is an alkyl group, A₁, A₂, A₃ and A₄ are each halogen.

2. A non-aqueous electrolyte secondary battery according to claim 1, wherein the benzene compound is selected from the group consisting of:

##STR27##

4. A non-aqueous electrolyte secondary battery according to claim 1, wherein a polyolefin porous film is, as a separator, disposed between said positive pole and said negative pole.

3. A non-aqueous electrolyte secondary battery comprising:

a negative pole made of metal material mainly composed of lithium or carbon material capable doping and removing lithium;

a positive pole made of a composite oxide of lithium and transition metal; and

electrolyte which is non-aqueous electrolyte in which a LiBF4 is dissolved in non-aqueous solvent, wherein

the non-aqueous electrolyte contains a benzene compound having a reversible oxidation-reduction potential at a potential higher than a positive pole potential in a state where said non-aqueous electrolyte secondary battery is fully charged and having p-electron orbital, and the benzene compound is one expressed by the formula;

##STR28##

5. A non-aqueous electrolyte secondary battery according to claim 3, wherein a polyolefin porous film is, as a separator, disposed between said positive pole and said negative pole.