Ester compound, and non-aqueous electrolyte solution and lithium secondary battery each using the ester compound

• US 8,263,268 B2
• Filed: 02/01/2008
• Issued: 09/11/2012
• Est. Priority Date: 02/02/2007
• Status: Active Grant

• Current Assignee: MU Ionic Solutions Corporation
• Original Assignee: UBE Industries Limited
• Inventors: Abe, Koji, Hashimoto, Chisen
• Primary Examiner(s): WEINER, LAURA S
• Application Number:
  US12/525,207
• Publication Number:
  US 20100119955A1
• Time in Patent Office: 1,684 Days
• Field of Search: 429/327, 429/307, 429/331, 429/330, 429/199, 429/338, 252/62.2
• US Class Current: 429/327
• CPC Class Codes: C07C 69/92 with etherified hydroxyl groups
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0567 characterised by the additives
• CPC Class Codes: H01M 2300/0025 Organic electrolyte
• CPC Class Codes: H01M 2300/0042 Four or more solvents
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

The present invention includes (1) an ester compound having a specific structure, (2) a nonaqueous electrolytic solution for lithium secondary battery comprising an electrolyte dissolved in a nonaqueous solvent and containing an ester compound having a specific structure in an amount of from 0.01 to 10% by weight of the nonaqueous electrolytic solution, which is excellent in initial battery capacity and cycle property, and (3) a lithium secondary battery comprising a positive electrode, a negative electrode and a nonaqueous electrolytic solution of an electrolyte salt dissolved in a nonaqueous solvent, wherein the nonaqueous electrolytic solution contains an ester compound having a specific structure in an amount of from 0.01 to 10% by weight of the nonaqueous electrolytic solution.

Claims

1. A nonaqueous electrolytic solution for a lithium secondary battery, the solution comprising an electrolyte dissolved in a nonaqueous solvent and an ester compound represented by formula (III) in an amount of from 0.01 to 10% by weight of the nonaqueous electrolytic solution:

2. The nonaqueous electrolytic solution of claim 1, wherein L² is a vinyl group, an allyl group or a propargyl group.

3. The nonaqueous electrolytic solution of claim 1, wherein at least two of R¹¹, R¹³ and R¹⁵ are fluorine atoms.

4. The nonaqueous electrolytic solution of claim 1, wherein the electrolytic solution further comprises at least two selected from the group consisting of ethylene carbonate, propylene carbonate, vinylene carbonate and fluoroethylene carbonate.

5. A lithium secondary battery, comprising a positive electrode, a negative electrode and a nonaqueous electrolytic solution of an electrolyte salt dissolved in a nonaqueous solvent, wherein the nonaqueous electrolytic solution comprises an ester compound of formula (III) in an amount of from 0.01 to 10% by weight of the nonaqueous electrolytic solution: