Nonaqueous electrolytic solution and nonaqueous electrolyte secondary battery

• US 9,553,333 B2
• Filed: 03/15/2013
• Issued: 01/24/2017
• Est. Priority Date: 09/16/2010
• Status: Active Grant

• Current Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.), MU Ionic Solutions Corporation
• Original Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Inventors: Tokuda, Hiroyuki, Sawa, Shuhei, Kotato, Minoru, Shima, Kunihisa, Ohashi, Youichi, Fukamizu, Koji
• Primary Examiner(s): WEINER, LAURA S
• Application Number:
  US13/842,473
• Publication Number:
  US 20130216919A1
• Time in Patent Office: 1,411 Days
• US Class Current: 1/1
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/056 characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
• 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: Y02E 60/10 Energy storage using batteries

Abstract

Provided are a nonaqueous electrolyte solution having improved durability properties in terms of cycling, storage and the like and improved discharge characteristic at a high current density, and a nonaqueous electrolyte battery that uses that nonaqueous electrolyte solution. The nonaqueous electrolyte solution containing a lithium salt and a nonaqueous solvent that dissolves the lithium salt, wherein the nonaqueous electrolyte solution contains a compound represented by formula (1) and at least one compound selected from the group consisting of a compound having a cyano group, a cyclic ester compound having a sulfur atom and a compound having an isocyanate group.

Claims

1. A nonaqueous electrolyte solution, comprising a lithium salt and a nonaqueous solvent that dissolves the lithium salt, wherein the nonaqueous electrolyte solution comprises 0.001 to 30 wt % of a compound represented by formula (1) and 0.001 to 5 wt % of a compound having a cyano group represented by formula (3):

2. The nonaqueous electrolyte solution according to claim 1, wherein said compound represented by formula (1) is a compound represented by formula (2):

3. The nonaqueous electrolyte solution according to claim 1, wherein said compound having a cyano group is a compound represented by NC—

(CH₂)_n—

CN(n=2 to

     6).

4. The nonaqueous electrolyte solution according to claim 1, comprising at least one compound selected from the group consisting of a cyclic carbonate having a double bond and a cyclic carbonate having a fluorine atom.

5. A nonaqueous electrolyte battery, comprising a negative electrode and a positive electrode that are capable of absorbing and releasing lithium ions, and the nonaqueous electrolyte solution according to claim 1.

6. A nonaqueous electrolyte battery, comprising a negative electrode and a positive electrode that are capable of absorbing and releasing lithium ions, and the nonaqueous electrolyte solution according to claim 2.

7. A nonaqueous electrolyte battery, comprising a negative electrode and a positive electrode that are capable of absorbing and releasing lithium ions, and the nonaqueous electrolyte solution according to claim 3.

8. A nonaqueous electrolyte battery, comprising a negative electrode and a positive electrode that are capable of absorbing and releasing lithium ions, and the nonaqueous electrolyte solution according to claim 4.