Nonaqueous electrolyte solution and nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-2020020987-A1
Application number	US-201916582141-A
Country	US
Kind code	A1
Filing date	Sep 25, 2019
Priority date	Mar 30, 2017
Publication date	Jan 16, 2020
Grant date	—

Abstract

A nonaqueous electrolyte solution according to one embodiment of the present disclosure contains a lithium salt and a nonaqueous solvent; the nonaqueous solvent contains fluoroethylene carbonate and a chain carboxylic acid ester having a dielectric constant of 6.0 or more; the lithium salt contains LiPO2F2 and LiSO3F; and the respective concentrations of LiPO2F2 and LiSO3F in the non-aqueous solvent are 0.15 mol/L or more.

First claim

1 . A non-aqueous electrolyte solution, comprising:
a lithium salt; and a non-aqueous solvent, wherein the non-aqueous solvent includes fluoroethylene carbonate (FEC) and a chain carboxylate ester having a dielectric constant of 6.0 or more; the lithium salt includes LiPO 2 F 2 and LiSO 3 F, and respective concentrations of the LiPO 2 F 2 and the LiSO 3 F in the non-aqueous solvent are 0.15 mol/L or more.

2 . The non-aqueous electrolyte solution according to claim 1 , wherein the chain carboxylate ester includes at least one of methyl acetate (MA), ethyl acetate (EA), and methyl propionate (MP).

3 . The non-aqueous electrolyte solution according to claim 1 , wherein a content of the chain carboxylate ester in the non-aqueous solvent is 50% by volume or more.

4 . The non-aqueous electrolyte solution according to claim 1 , wherein
the lithium salt further includes LiPF 6 and a concentration of the lithium salt in the non-aqueous solvent is 1.7 mol/L or more.

5 . The non-aqueous electrolyte solution according to claim 1 , wherein
the lithium salt further includes LiFSA and a content of the LiFSA in the lithium salt is 20 mol % or more and 80 mol % or less.

6 . The non-aqueous electrolyte solution according to claim 1 , wherein a content of the fluoroethylene carbonate in the non-aqueous solvent is 5% by volume or more and 30% by volume or less.

7 . The non-aqueous electrolyte solution according to claim 1 , wherein the non-aqueous solvent includes methyl 3,3,3-trifluoropropionate (FMP).

8 . The non-aqueous electrolyte solution according to claim 1 , wherein the non-aqueous solvent includes 2,2,2-trifluoroethyl acetate (FEA).

9 . The non-aqueous electrolyte solution according to claim 1 , wherein the non-aqueous solvent includes 1-chloro-1,4,4,4-tetrafluorobutan-2-one (CTFB).

10 . A non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode, and a non-aqueous electrolyte solution, wherein the non-aqueous electrolyte solution is the non-aqueous electrolyte solution according to claim 1 .

11 . The non-aqueous electrolyte secondary battery according to claim 10 , wherein the negative electrode includes a negative electrode active material layer and the negative electrode active material layer includes a lithium salt.

12 . A non-aqueous electrolyte secondary battery, comprising:
a positive electrode; a negative electrode; and a non-aqueous electrolyte solution, wherein the non-aqueous electrolyte solution includes a lithium salt and a non-aqueous solvent; the non-aqueous solvent includes fluoroethylene carbonate (FEC) and a chain carboxylate ester having a dielectric constant of 6.0 or more; the lithium salt includes LiPO 2 F 2 and LiSO 3 F; a composite film including Li, P, S, C, N, O, and F as constituent elements is formed on a surface of the negative electrode; S atom is included at a proportion of 1% or more, and P atom is included at a proportion of 1% or more when the total amount of the constituent elements of the composite film is calculated as 100 atomic %.

13 . The non-aqueous electrolyte secondary battery according to claim 12 , wherein the negative electrode includes a negative electrode active material layer and the negative electrode active material layer includes a lithium salt.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Morisawa Naoya
• Iida Kazuhiro
• Deguchi Masaki
• Fukui Atsushi

Classifications

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M2300/0034

  Fluorinated solvents · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M2300/004

  Three solvents · CPC title

• H01M2004/027

  Negative electrodes · CPC title