Non-aqueous electrolyte secondary battery

{
  "publication_number": "US5709968A",
  "country": "US",
  "kind": "A",
  "title": "Non-aqueous electrolyte secondary battery",
  "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, A 1, A 2, A 3, A 4 and A 5 are each H or halogen and at least one of A 1, A 2, A 3, A 4 and A 5 is halogen; ##STR23## where R is an alkyl group, A 1, A 2, A 3 and A 4 are each H or halogen and at least any one of A 1, A 2, A 3 and A 4 is halogen; ##STR24## where R is an alkyl group, A 1, A 2, A 3 and A 4 are each H or halogen and at least any one of A 1, A 2, A 3 and A 4 is halogen; ##STR25## where R is an alkyl group, A 1, A 2 and A 3 are each H or halogen and at least any one of A 1, A 2 and A 3 is halogen; ##STR26## where R is an alkyl group, A 1, A 2, A 3 and A 4 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##",
    "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##",
    "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.",
    "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."
  ],
  "description_excerpt": "1. Field of the Invention\n\nThe present invention relates a non-aqueous electrolyte secondary battery for obtaining electromotive force due to introduction and discharge of lithium ions, and more particularly to a technique for preventing overcharge occurring due to chemical reactions of additives to the battery.\n\n2. Prior Art\n\nSecurity is the most important consideration for a lithium secondary battery (non-aqueous electrolyte secondary battery). In particular, protection from overcharge is an important fact.\n\nFor example, if the charge voltage for, for example, a nickel-cadmium battery, has been raised, consumption of charge energy taking place due to chemical reactions of water causes an overcharge protective mechanism to act. However, the lithium secondary battery, which is the non-aqueous type secondary battery, must have another mechanism.\n\nAs an overcharge protective mechanism for the lithium secondary battery, there have been suggested a method using an electronic circuit, a method of mechanically interrupting an electric current by using gas generation when overcharge takes place, a shut down method using fusion of a separator and a method using chemical reactions of a reagent. However, each method has the following problem and, therefore, a satisfactory overcharge protective mechanism has not been realized yet.\n\nThe method using an electronic circuit or the method of mechanically interrupting an electric current causes the battery to have an additional structure. Therefore, the cost of the battery cannot be reduced and various limitations arise in designing a product of the battery.",
  "cpc": [
    "H01M 10/0567",
    "H01M 10/30",
    "H01M 10/4235",
    "H01M 2200/00",
    "H01M 6/164",
    "H01M 6/168",
    "H01Q 1/242",
    "H01Q 1/246",
    "H01Q 1/3291",
    "H04B 1/3877",
    "Y02E 60/10"
  ],
  "ipc": [
    "C07C 43/192",
    "H01M 10/05",
    "H01M 10/052",
    "H01M 10/0569",
    "H01M 10/42",
    "H01Q 1/24",
    "H01Q 1/32",
    "H01Q 1/50",
    "H01Q 19/10",
    "H01Q 21/28",
    "H04B 1/38"
  ],
  "assignees": [
    "Sony Corp"
  ],
  "inventors": [
    "Ryuichi Shimizu"
  ],
  "filing_date": "1996-05-24",
  "publication_date": "1998-01-20",
  "grant_date": "1998-01-20",
  "priority_date": "1995-05-26",
  "application_number": "US-65345796-A",
  "family_id": "26463669",
  "cited_by_count": 158,
  "citations": [
    "US2900434A",
    "US4463072A",
    "US4544616A",
    "US5470674A"
  ]
}