Non-aqueous electrolytic solution and lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-2018183099-A1
Application number	US-201515324453-A
Country	US
Kind code	A1
Filing date	Jun 11, 2015
Priority date	Jul 9, 2014
Publication date	Jun 28, 2018
Grant date	—

Abstract

The present invention provides a non-aqueous electrolytic solution comprising a phosphinoamine-based compound represented by formula (1) below and a lithium ion secondary battery comprising the non-aqueous electrolytic solution. By adding the phosphinoamine-based compound to the non-aqueous electrolytic solution, oxidative degradation in the non-aqueous electrolytic solution is suppressed, and thus gas generation is suppressed.

First claim

1 . A non-aqueous electrolytic solution comprising a phosphinoamine-based compound represented by the following general formula (1):

wherein R 1 and R 2 are each independently a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, or a hydroxy group; R 3 and R 4 are each independently a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, or a hydroxy group; R 1 and R 2 are optionally bonded via a single bond, an ether bond, or a hydrocarbon chain having 1 to 4 carbon atoms; and R 3 and R 4 are optionally bonded via a single bond, an ether bond, or a hydrocarbon chain having 1 to 4 carbon atoms.

2 . The non-aqueous electrolytic solution according to claim 1 , wherein the phosphinoamine-based compound is at least one selected from compounds (PN-1) to (PN-8) below:

3 . The non-aqueous electrolytic solution according to claim 1 , wherein a content of the phosphinoamine-based compound in the non-aqueous electrolytic solution is 0.001 mass % or more and 5.0 mass % or less.

4 . The non-aqueous electrolytic solution according to claim 1 , further comprising an electrolyte salt and a non-aqueous electrolytic solvent.

5 . A lithium ion secondary battery comprising the non-aqueous electrolytic solution according to claim 1 .

6 . The lithium ion secondary battery according to claim 5 , comprising an electrode assembly in which a positive electrode and a negative electrode are disposed to face each other with a separator therebetween, and a casing enclosing the electrode assembly and the non-aqueous electrolytic solution.

7 . The lithium ion secondary battery according to claim 5 , wherein the positive electrode comprises a positive electrode active material that operates at an electric potential of 4.5 V or more versus lithium.

8 . The lithium ion secondary battery according to claim 5 , wherein the casing is a laminate film.

9 . A lithium ion secondary battery comprising the non-aqueous electrolytic solution according to claim 2 .

10 . The lithium ion secondary battery according to claim 9 , comprising an electrode assembly in which a positive electrode and a negative electrode are disposed to face each other with a separator therebetween, and a casing enclosing the electrode assembly and the non-aqueous electrolytic solution.

11 . The lithium ion secondary battery according to claim 9 , wherein the positive electrode comprises a positive electrode active material that operates at an electric potential of 4.5 V or more versus lithium.

12 . The lithium ion secondary battery according to claim 9 , wherein the casing is a laminate film.

13 . A lithium ion secondary battery comprising the non-aqueous electrolytic solution according to claim 3 .

14 . The lithium ion secondary battery according to claim 13 , comprising an electrode assembly in which a positive electrode and a negative electrode are disposed to face each other with a separator therebetween, and a casing enclosing the electrode assembly and the non-aqueous electrolytic solution.

15 . The lithium ion secondary battery according to claim 13 , wherein the positive electrode comprises a positive electrode active material that operates at an electric potential of 4.5 V or more versus lithium.

16 . The lithium ion secondary battery according to claim 13 , wherein the casing is a laminate film.

17 . A lithium ion secondary battery comprising the non-aqueous electrolytic solution according to claim 4 .

18 . The lithium ion secondary battery according to claim 17 , comprising an electrode assembly in which a positive electrode and a negative electrode are disposed to face each other with a separator therebetween, and a casing enclosing the electrode assembly and the non-aqueous electrolytic solution.

19 . The lithium ion secondary battery according to claim 17 , wherein the positive electrode comprises a positive electrode active material that operates at an electric potential of 4.5 V or more versus lithium.

20 . The lithium ion secondary battery according to claim 17 , wherein the casing is a laminate film.

Assignees

• Nec Corp

Inventors

• Sato Shizuka
• Maeda Katsumi
• Tamura Noriyuki
• Hattori Sadanori

Classifications

• C07F9/6568

  having phosphorus atoms as the only ring hetero atoms · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M2300/0037

  Mixture of solvents · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title