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

Patent metadata

Field	Value
Publication number	US-12027668-B2
Application number	US-202218269992-A
Country	US
Kind code	B2
Filing date	Aug 18, 2022
Priority date	Aug 20, 2021
Publication date	Jul 2, 2024
Grant date	Jul 2, 2024

Abstract

A non-aqueous electrolyte solution for a lithium secondary battery includes a compound represented by Formula 1 as follows, a lithium salt, and an organic solvent; and a lithium secondary battery including the same are described:

wherein R, R′, R1 to R3 and n are described herein.

First claim

The invention claimed is:

1. A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution comprising a lithium salt, an organic solvent, and an additive represented by Formula 1:

wherein, in Formula 1,
R and R′ are each independently hydrogen or an alkyl group having 1 to 10 carbon atoms,
R1 to R3 are each independently hydrogen or an alkyl group having 1 to 10 carbon atoms, and
n is an integer of 1 to 10,
wherein the additive is included in an amount of 0.1 wt % to 5 wt % based on a total weight of the non-aqueous electrolyte solution.

2. The non-aqueous electrolyte solution of claim 1 , wherein the additive is represented by Formula 1a:

3. The non-aqueous electrolyte solution of claim 1 , wherein at least one of R1, R2 or R3 in Formula 1 is an alkyl group having 1 to 10 carbon atoms.

4. The non-aqueous electrolyte solution of claim 1 , wherein R2 in Formula 1 is an alkyl group having 1 to 10 carbon atoms.

5. The non-aqueous electrolyte solution of claim 1 , wherein each of R and R′ in Formula 1 is hydrogen.

6. The non-aqueous electrolyte solution claim 1 , wherein the additive is included in an amount of 0.1 wt % to 1 wt % based on a-the total weight of the non-aqueous electrolyte solution.

7. The non-aqueous electrolyte solution of claim 1 , further comprising a second additive selected from vinylene carbonate, 1,3-propane sultone, ethylene sulfate, or-lithium difluoro phosphate, or a mixture thereof,
wherein the second additive is included in an amount of 0.1 wt % to 10 wt % based on the total weight of the non-aqueous electrolyte solution.

8. The non-aqueous electrolyte solution of claim 1 , wherein the organic solvent comprises a mixture of a cyclic carbonate-based solvent and a linear carbonate-based solvent.

9. The non-aqueous electrolyte solution of claim 1 , wherein n in Formula 1 is an integer of 1 to 5.

10. The non-aqueous electrolyte solution of claim 1 , wherein the lithium salt comprises at least one selected from LiPF 6 , LiClO 4 , LiBF 4 , LiN(FSO 2 ) 2 , lithium bis(trifluoromethanesulfonyl)imide, lithium bis(pentafluoroethanesulfonyl)imide, LiSO 3 CF 3 , LiPO 2 F 2 , lithium bis(oxalate)borate, lithium difluoro(oxalate)borate, lithium difluoro(bisoxalato) phosphate, lithium tetrafluoro(oxalate) phosphate, or lithium fluoromalonato(difluoro) borate.

11. 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 positive electrode and the negative electrode; and
the non-aqueous electrolyte solution of claim 1 .

12. The lithium secondary battery of claim 11 , wherein the positive electrode active material comprises a lithium composite transition metal oxide represented by Formula 2:
Li 1+x x(Ni a Co b Mn c M d )O 2   [Formula 2]

wherein, in Formula 2,
M is at least one selected from W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, or Mo,
1+x, a, b, c, and d are each independently an atomic fraction of Li, Ni, Co, Mn and M, respectively, and
−0.2≤x≤0.2, 0.50≤a<1, 0<b≤0.3, 0<c≤0.3, 0≤d≤0.1, and a+b+c+d=1.

13. The lithium secondary battery of claim 12 , wherein the lithium composite transition metal oxide is at least one selected from Li(Ni 0.6 Mn 0.2 Co 0.2 )O 2 , Li(Ni 0.7 Mn 0.15 Co 0.15 )O 2 , Li(Ni 0.8 Mn 0.1 Co 0.1 )O 2 , or Li(Ni 0.9 Mn 0.03 Co 0.06 Al 0.01 )O 2 .

14. The lithium secondary battery of claim 11 , wherein the positive electrode active material has a molar ratio of nickel among transition metals of 70 mol % or to less than 100 mol %.

15. The lithium secondary battery of claim 11 , wherein the negative electrode active material comprises a silicon-based material and a carbon-based material, wherein the silicon-based material is included in an amount of 1 wt % to 20 wt % based on a total weight of the negative electrode active material.

16. The lithium secondary battery of claim 15 , wherein the silicon-based material is at least one selected from Si, SiO x (0<x<2), or a Si—Y alloy, wherein Y is an element selected from an alkali metal, an alkaline earth metal, a Group 13 element, a Group 14 element, a transition metal, a rare earth element, or a combination thereof, and is not Si.

Assignees

• Lg Energy Solution Ltd

Inventors

• Park Sung Guk
• Lee Chul Haeng
• Oh Jeong Woo
• Park Byung Chun
• Kim Hyung Tae
• Seo Young Mi

Classifications

• H01M2300/0037

  Mixture of solvents · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/027

  Negative electrodes · 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