Nonaqueous electrolyte solution and nonaqueous secondary battery

Patent metadata

Field	Value
Publication number	US-2016126594-A1
Application number	US-201614993188-A
Country	US
Kind code	A1
Filing date	Jan 12, 2016
Priority date	Jul 29, 2013
Publication date	May 5, 2016
Grant date	—

Abstract

A nonaqueous electrolyte solution including a nonaqueous solvent; an electrolyte; and a combustion inhibitor, in which the combustion inhibitor contains a phosphazene compound, and specific conditions are defined by boiling points of a combustion inhibitor, a boiling point of a solvent, and the like.

First claim

What is claimed is:

1 . A nonaqueous electrolyte solution comprising:
a nonaqueous solvent; an electrolyte; and a combustion inhibitor, wherein the combustion inhibitor contains a phosphazene compound, and at least one of Conditions (I) to (III) described below is satisfied: (I) the nonaqueous solvent contains a solvent having a boiling point of 120° C. or lower, a phosphazene compound X1 having a boiling point x1 (unit: ° C.) under 1 atmospheric pressure and a phosphorus-containing compound Y1 having a boiling point y1 (unit: ° C.) under 1 atmospheric pressure are at least used as combustion inhibitors, and Formula (i) below is satisfied with respect to the boiling points x1 and y1 of the combustion inhibitors,
x 1≦120< y 1≦220  (i)

(II) a phosphazene compound X2 having a boiling point x2 (unit: ° C.) under 1 atmospheric pressure and a phosphorus-containing compound Y2 having a boiling point y2 (unit: ° C.) under 1 atmospheric pressure are at least used as combustion inhibitors, and Formula (ii) below is satisfied with respect to the boiling points x2 and y2 of the combustion inhibitors and a boiling point a (unit: ° C.) of a solvent A having the lowest boiling point among nonaqueous solvents under 1 atmospheric pressure,
x 2≦ a<y 2≦ a+ 90  (ii)

(III) the nonaqueous solvent contains 20% by volume to 80% by volume of a solvent having a boiling point of 100° C. or lower with respect to all the nonaqueous solvent and contains 1% by mass to 20% by mass of a combustion inhibitor X3 expressed by Formula (X3) below with respect to all the electrolyte solution,

(Ra represents a substituent containing carbon atoms and the number of C—H bonds is 3 or less).

2 . The nonaqueous electrolyte solution according to claim 1 ,
wherein each of the combustion inhibitors Y1 and Y2 is independently selected from a phosphoric acid ester compound, a phosphoric acid amide compound, and a phosphazene compound.

3 . The nonaqueous electrolyte solution according to claim 1 ,
wherein each of the combustion inhibitors X1, X2, X3, Y1, and Y2 independently represents a cyclic phosphazene compound.

4 . The nonaqueous electrolyte solution according to claim 1 ,
wherein each of Y1 and Y2 independently represents a cyclic phosphazene compound having an amino group.

5 . The nonaqueous electrolyte solution according to claim 1 ,
wherein the nonaqueous solvent contains 20% by volume to 80% by volume of dimethyl carbonate and/or ethyl methyl carbonate with respect to all the solvent.

6 . The nonaqueous electrolyte solution according to claim 1 ,
wherein the nonaqueous solvent contains 20% by volume to 80% by volume of dimethyl carbonate with respect to all of a solvent.

7 . The nonaqueous electrolyte solution according to claim 1 ,
wherein each of at least one of the combustion inhibitors X1, X2, X3, Y1, and Y2 independently represents a cyclic phosphazene compound expressed by Formula (F1) below.

8 . The nonaqueous electrolyte solution according to claim 1 ,
wherein the electrolyte solution further contains at least one selected from an aromatic compound (A), a halogen-containing compound (B), a polymerizable compound (C), a phosphorus-containing compound (D), a sulfur-containing compound (E), a silicon-containing compound (F), a nitrile compound (G), a metal complex compound (H), and an imide compound (I).

9 . A nonaqueous secondary battery comprising:
a cathode; an anode; and the nonaqueous electrolyte solution according to claim 1 .

10 . The nonaqueous secondary battery according to claim 9 ,
wherein an active material of the cathode contains Ni and/or Mn atoms.

11 . The nonaqueous secondary battery according to claim 9 ,
wherein an active material of the anode is one selected from carbon, Si, titanium, and tin.

12 . A method of using the secondary battery according to claim 9 for charging and discharging,
wherein the secondary battery is used at a positive electrode potential (based on Li/Li + ) of 4.3 V or greater.

Assignees

• Fujifilm Corp

Inventors

• Kodama Kunihiko
• Kinoshita Ikuo
• Ishiji Yohei
• Yawata Toshihiko

Classifications

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title