Nonaqueous electrolytic solution and secondary battery containing the same

• US 20030068561A1
• Filed: 09/20/2002
• Published: 04/10/2003
• Est. Priority Date: 05/26/2000
• Status: Active Grant

• Current Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Original Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Inventors: Okahara, Kenji, Suzuki, Hitoshi, Shima, Noriko
• Granted Patent: US 6,905,799 B2
• Time in Patent Office: Days
• US Class Current: 429/326
• CPC Class Codes: C07D 307/91 Dibenzofurans; Hydrogenated dibenzofurans
• 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 10/4235 Safety or regulating additives or arrangements in electrodes, separators or electrolyte H01M10/4242 takes precedence
• CPC Class Codes: H01M 2010/4292 Aspects relating to capacity ratio of electrodes/electrolyte or anode/cathode
• CPC Class Codes: H01M 2300/0037 Mixture of solvents
• 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 4/587 for inserting or intercalating light metals
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

There are disclosed a non-aqueous electrolyte which comprises a non-aqueous organic solvent and a lithium salt, and further contains a compound represented by the following formula (I):

wherein X represents —O—, —S—, —CO— or —SO₂, Y represents a single bond, —CH₂—, —CH₂—CH₂—, —CH═CH— or —CO— and R¹ to R⁸ each independently represent a hydrogen atom, an alkyl group, a phenyl group, or a halogen group, provided that X and Y do not represent —CO— at the same time..

Claims

1. A non-aqueous electrolyte which comprises a non-aqueous organic solvent and a lithium salt, and further contains a compound represented by the following formula (I):

2. The non-aqueous electrolyte according to claim 1, wherein X represents —

O—

, —

S—

or —

CO— and

Y represents a single bond, —

CH₂—

CH₂—

, —

CH═

CH—

or —

CO—

(provided that X and Y do not represent —

CO—

at the same time).

3. The non-aqueous electrolyte according to claim 1, wherein X represents —

O—

or —

S— and

Y represents a single bond or —

CO—

.

4. The non-aqueous electrolyte according to claim 1, wherein X represents —

O— and

Y represents a single bond.

5. The non-aqueous electrolyte according to claim 1, wherein X represents —

CO— and

Y represents a single bond, —

CH₂—

CH₂—

or —

CH═

CH—

.

6. The non-aqueous electrolyte according to any one of claims 1 to 5, wherein the compound represented by the formula (I) is contained in the electrolyte in an amount of 0.01 to 0.8 mmol/g.

7. The non-aqueous electrolyte according to any one of claims 1 to 6, wherein it is an electrolyte for a non-aqueous secondary battery comprising a cathode containing a lithium metal complex oxide and an anode containing a material which is capable of storing and releasing lithium.

8. A non-aqueous secondary battery which is equipped with a cathode containing a lithium metal complex oxide, an anode containing a material which is capable of storing and releasing lithium and the electrolyte according to any one of claims 1 to 7.

9. A non-aqueous secondary battery which is equipped with a cathode containing a lithium metal complex oxide, an anode containing a material which is capable of storing and releasing lithium and an electrolyte, wherein the cathode comprises the compound represented by the formula (I) according to any one of claims 1 to 5.

10. The non-aqueous secondary battery according to claim 8 or 9, wherein the lithium metal complex oxide is a lithium cobalt oxide, lithium nickel oxide and/or lithium manganese oxide.

11. The non-aqueous secondary battery according to any one of claims 8 to 10, wherein the material which is capable of storing and releasing lithium is a carbonaceous material.