Non-aqueous electrolyte solution and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-12199233-B2
Application number	US-202017615690-A
Country	US
Kind code	B2
Filing date	Aug 27, 2020
Priority date	Sep 3, 2019
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

A non-aqueous electrolyte solution and a lithium secondary battery including the same are disclosed herein. In some embodiments, a non-aqueous electrolyte solution includes an organic solvent, a lithium salt, and an oligomer represented by Formula 1 as a surfactant, wherein the organic solvent contains containing cyclic carbonate, dimethyl carbonate, and alkyl formate.

First claim

The invention claimed is:

1. A non-aqueous electrolyte solution, comprising:
an organic solvent containing cyclic carbonate, dimethyl carbonate, and alkyl formate;
a lithium salt; and
an oligomer represented by Formula 1 as a surfactant

wherein, in Formula 1,
R f is an alkylene group having 1 to 5 carbon atoms which is unsubstituted or substituted with at least one fluorine,
R g , R h , R i , and R j are each independently fluorine or an alkyl group having 1 to 3 carbon atoms which is unsubstituted or substituted with fluorine,
R 0 is an aliphatic hydrocarbon group or an aromatic hydrocarbon group,
R′″ is hydrogen or an alkyl group having 1 to 3 carbon atoms,
o is an integer of 1 to 3,
p is an integer of 1 to 10, and
q is an integer of 1 to 15.

2. The non-aqueous electrolyte solution of claim 1 , wherein the organic solvent comprises 10 vol % to 30 vol % of the cyclic carbonate, 40 vol % to 85 vol % of the dimethyl carbonate, and 5 vol % to 30 vol % of the alkyl formate.

3. The non-aqueous electrolyte solution of claim 1 , wherein the organic solvent comprises 15 vol % to 25 vol % of the cyclic carbonate, 50 vol % to 80 vol % of the dimethyl carbonate, and 5 vol % to 20 vol % of the alkyl formate.

4. The non-aqueous electrolyte solution of claim 1 , wherein the alkyl formate comprises at least one selected from the group consisting of methyl formate, ethyl formate, propyl formate, n-butyl formate, and iso-butyl formate.

5. The non-aqueous electrolyte solution of claim 1 , wherein the oligomer represented by Formula 1 is an oligomer represented by Formula 1-1

wherein, in Formula 1-1,
p1 is an integer of 1 to 10, and
q1 is an integer of 1 to 15.

6. The non-aqueous electrolyte solution of claim 1 , wherein the surfactant is present in an amount of 0.01 wt % to 5 wt % based on a total weight of the non-aqueous electrolyte solution.

7. The non-aqueous electrolyte solution of claim 1 , further comprising at least one additive selected from the group consisting of a cyclic carbonate-based compound, a halogen-substituted carbonate-based compound, a sultone-based compound, a sulfate-based compound, a phosphate-based compound, a borate-based compound, a nitrile-based compound, a benzene-based compound, an amine-based compound, a silane-based compound, and a lithium salt-based compound.

8. The non-aqueous electrolyte solution of claim 1 , further comprising an additive, wherein the additive comprises a cyclic carbonate-based compound, a sultone-based compound, a sulfate-based compound, a lithium salt-based compound, and a benzene-based compound.

9. A lithium secondary battery comprising:
a positive electrode including a positive electrode active material;
a negative electrode including a negative electrode active material;
a separator disposed between the negative electrode and the positive electrode; and
the non-aqueous electrolyte solution of claim 1 .

10. The lithium secondary battery of claim 9 , wherein the positive electrode active material is a lithium composite transition metal oxide represented by Formula A,
Lix[NiyCozMnwM1v]O2-pAp  [Formula A]

wherein, in Formula A,
M1 comprises at least one element selected from the group consisting of W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo,
A comprises at least one element selected from the group consisting of F, Cl, Br, I, At and S, and 0.8≤x≤1.2, 0.7≤y<1, 0<z<0.3, 0<w<0.3, 0≤v≤0.2, and 0≤p≤0.2.

11. The lithium secondary battery of claim 9 , wherein the negative electrode active material comprises a carbon-based negative electrode active material and a silicon-based negative electrode active material.

12. The lithium secondary battery of claim 11 , wherein the carbon-based negative electrode active material and the silicon-based negative electrode active material are present in a weight ratio of 99:1 to 50:50.

Assignees

• Lg Energy Solution Ltd

Inventors

• Kim Gwang Yeon
• Oh Jeong Woo
• Lee Chul Haeng

Classifications

• H01M2300/004

  Three solvents · CPC title

• H01M2300/002

  Inorganic electrolyte · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/0525 Primary

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