Non-aqueous electrolytic salt and non-aqueous electrolytic secondary battery in which it is used

• US 6,566,015 B1
• Filed: 10/08/1999
• Issued: 05/20/2003
• Est. Priority Date: 10/09/1998
• Status: Expired due to Term

• Current Assignee: Asahi Denka Kogyo KK (Adeka Corporation), DENSO Corporation
• Original Assignee: Asahi Denka Kogyo KK (Adeka Corporation), DENSO Corporation
• Inventors: Oikawa, Tomoyuki, Yamada, Manabu, Takeuchi, Yasunori, Kubota, Naohiro
• Primary Examiner(s): Ryan, Patrick
• Assistant Examiner(s): Mercado, Julian
• Application Number:
  US09/414,864
• Time in Patent Office: 1,320 Days
• Field of Search: 429/324, 429/325, 429/326, 429/330, 429/345, 429/332, 429/333, 429/199
• US Class Current: 429/326
• CPC Class Codes: C07D 295/02 containing only hydrogen and carbon atoms in addition to the ring hetero elements
• CPC Class Codes: C07D 295/023 Preparation; Separation; Stabilisation; Use of additives
• CPC Class Codes: C07H 7/00 Compounds containing non-saccharide radicals linked to saccharide radicals by a carbon-to-carbon bond
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0569 characterised by the solvents
• CPC Class Codes: H01M 2200/10 Temperature sensitive devices
• CPC Class Codes: H01M 2300/0034 Fluorinated solvents
• CPC Class Codes: H01M 2300/004 Three solvents
• CPC Class Codes: H01M 6/164 by the solvent
• CPC Class Codes: H01M 6/168 by additives
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

The prevent invention provides a non-aqueous electrolyte for batteries comprising the dissolving of an electrolytic salt in an organic solvent, wherein said organic solvent contains at least one type each of cyclic carbonate compound, alkyl mono-carbonate compound represented by chemical formula (1), alkylene bis-carbonate compound represented by chemical formula (2), glycol diether compound represented by chemical formula (3) (R⁶O—(R⁷O)_n—R⁸) and phosphorous-containing organic compound.

The use of at least one type of glycol diether represented with this general formula is able to yield satisfactory output characteristics by lowering the internal resistance of the battery as a result of increasing the mobility of lithium ions at the solid-liquid interface.

Claims

1. A battery non-aqueous electrolyte comprising an organic solvent comprising an electrolytic salt dissolved therein, wherein said organic solvent contains at least one type each of cyclic carbonate compounds, alkylene bis-carbonate compounds represented by chemical formula (2), alkyl mono-carbonate compounds represented by chemical formula (1), glycol diether compounds represented by chemical formula (3) and phosphorous-containing organic compounds:

2. A non-aqueous electrolyte according to claim 1 wherein said alkylene bis-carbonate compound, said glycol diether compound and said phosphorous-containing organic compound are each contained at 5 to 35 vol % assuming the total amount of said organic solvent to be 100 vol %.

3. A non-aqueous electrolyte according to claim 1 wherein said cyclic carbonate compound is contained at 20 to 50 vol % assuming the total amount of said organic solvent to be 100 vol %.

4. A non-aqueous electrolyte according to claim 1 wherein said alkyl mono-carbonate compound is contained at 30 to 50 vol % assuming the total amount of said organic solvent to be 100 vol %.

5. A non-aqueous electrolyte according to claim 1 wherein said phosphorous-containing organic compound contains at least one type of organic compound selected from the group consisting of phosphate ester, phosphonate ester and phosphinate ester.

6. A non-aqueous electrolyte according to claim 1 wherein said electrolytic salt is comprised of one type or a combination of two or more types selected from the group consisting of inorganic salts composed of lithium ion and anion selected from the group consisting of PF₆⁻

, BF₄⁻

, ClO₄⁻

and AsF₆⁻

, and organic salts composed of lithium ion and anion selected from the group consisting of SO₃CF₃⁻

, N(CF₃SO₂)₂⁻

, C(CF₃SO₂)₃⁻

and their derivatives.

7. A non-aqueous electrolytic battery having a non-aqueous electrolyte, positive electrode and negative electrode, wherein an organic solvent of said non-aqueous electrolyte contains at least one type each of cyclic carbonate compounds, alkylene bis-carbonate compounds represented by chemical formula (2), alkyl mono-carbonate compounds represented by chemical formula (1), glycol diether compound represented by chemical formula (3) and phosphorous-containing organic compounds: