Electrolyte for lithium secondary battery and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-12431536-B2
Application number	US-202118007734-A
Country	US
Kind code	B2
Filing date	Apr 30, 2021
Priority date	Jun 15, 2020
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

Abstract

Provided is an electrolyte for a lithium secondary battery, the electrolyte including a non-aqueous organic solvent, a lithium salt, and an additive, wherein the additive includes a compound represented by Chemical Formula 1.The definitions of each of the substituents in Chemical Formula 1 are as set forth in the detailed description.

First claim

The invention claimed is:

1. An electrolyte for a lithium secondary battery, comprising
a non-aqueous organic solvent;
a lithium salt; and
an additive represented by Chemical Formula 1:

wherein, in Chemical Formula 1,
X 1 and X 2 are each independently O, S, CR a R b , or NR c ,
provided that at least one of X 1 and X 2 is O or S,
L 1 is a substituted or unsubstituted C1 to C10 alkylene group or a substituted or unsubstituted C2 to C10 alkenylene group,
R 1 to R 4 are each independently hydrogen, a C1 to C10 alkyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C3 to C10 cycloalkenyl group, a substituted or unsubstituted C6 to C20 an aryl group, or a combination thereof, and
n is an integer of any one of 1 to 3.

2. The electrolyte of claim 1 , wherein
the compound represented by Chemical Formula 1 is represented by Chemical Formula 1A:

wherein, in Chemical Formula 1A,
the definitions of X 1 , X 2 , L 1 , and R 1 to R 4 are the same as in claim 1 .

3. The electrolyte of claim 1 , wherein
the compound represented by Chemical Formula 1 is represented by any one of Chemical Formula 1-1 to Chemical Formula 1-3:

wherein, in Chemical Formula 1-1 to Chemical Formula 1-3,
the definitions of L 1 , R 1 to R 4 , and n are the same as in claim 1 .

4. The electrolyte of claim 1 , wherein
R 1 to R 4 are each independently hydrogen, a C1 to C6 alkyl group, a substituted or unsubstituted C1 to C6 alkoxy group, a substituted or unsubstituted C2 to C6 alkenyl group, a substituted or unsubstituted C3 to C6 cycloalkyl group, a substituted or unsubstituted C3 to C6 cycloalkenyl group, a substituted or unsubstituted C6 to C10 an aryl group, or a combination thereof.

5. The electrolyte of claim 1 , wherein
L 1 is a substituted or unsubstituted C1 to C6 alkylene group.

6. The electrolyte of claim 1 , wherein
the compound represented by Chemical Formula 1 is represented by any one of Chemical Formula 1-a to Chemical Formula 1-r:

7. The electrolyte of claim 1 , wherein
the compound represented by Chemical Formula 1 is included in an amount of 0.1 wt % to 10 wt % based on the total amount of the electrolyte for a lithium secondary battery.

8. The electrolyte of claim 1 , wherein
the compound represented by Chemical Formula 1 is included in an amount of 0.1 wt % to 3.0 wt % based on the total amount of the electrolyte for a lithium secondary battery.

9. A lithium secondary battery, comprising
a positive electrode including a positive active material;
a negative electrode including an anode active material; and
the electrolyte of claim 1 .

10. The lithium secondary battery of claim 9 , wherein
the positive active material includes at least one of a composite oxide of lithium and a metal selected from cobalt, manganese, nickel, and a combination thereof.

11. The lithium secondary battery of claim 9 , wherein
the positive active material is represented by Chemical Formula 2:
Li a Ni x1 CO y1 M z1 O 2   [Chemical Formula 2]

wherein, in Chemical Formula 2,
0.9≤a≤1.8, 0.5<x1≤1, 0<y1≤0.5, 0<z1≤0.5, x1+y1+z1=1, and M is Ni, Co, Mn, Al, Ti, Mg, Zr, Ca, Nb, Fe, P, F, B, or a combination thereof.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Lee Junyong
• Shatunov Pavel
• Kim Soojin
• Park Injun
• Lee Tae Jin
• Jeong Hyejeong
• Choi Hyunbong
• Han Jungmin

Classifications

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01M10/0525

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

• H01M4/525 Primary

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