Electrolyte for rechargeable lithium battery and rechargeable lithium battery comprising same

Patent metadata

Field	Value
Publication number	US-2023178805-A1
Application number	US-202117995476-A
Country	US
Kind code	A1
Filing date	Mar 2, 2021
Priority date	Apr 14, 2020
Publication date	Jun 8, 2023
Grant date	—

Abstract

The present invention relates to: an electrolyte for a rechargeable lithium battery, the electrolyte including a non-aqueous organic solvent, a lithium salt, and an electrolyte additive for a rechargeable lithium battery, the electrolyte additive including a compound represented by Chemical Formula 1; and a rechargeable lithium battery comprising the electrolyte for a rechargeable lithium battery. Chemical Formula 1 is as defined in the specification.

First claim

1 . An electrolyte for a rechargeable lithium battery, comprising
a non-aqueous organic solvent, a lithium salt, and an additive, wherein the additive includes a compound represented by Chemical Formula 1:

wherein, in Chemical Formula 1,
L 1 is a single bond, a substituted or unsubstituted C1 to C5 alkylene group, a substituted or unsubstituted C1 to C5 cycloalkylene group, or a substituted or unsubstituted C6 to C15 arylene group,
Z is an isocyanate group (—NCO), an isothiocyanate group (—NCS), a cyanate group (—OCN), a thiocyanate group (—SCN), a cyano group (—CN), or an isocyano group (—NC), and
R 1 and R 2 are the same or different and are each independently hydrogen, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C1 to C10 alkenyl group, a substituted or unsubstituted C1 to C10 alkynyl group, a substituted or unsubstituted C3 to C20 cycloalkyl group, or a halide group.

2 . The electrolyte for a rechargeable lithium battery of claim 1 , wherein
L is a single bond, or a substituted or unsubstituted C1 to C3 alkylene group, Z is an isocyanate group (—NCO) or an isothiocyanate group (—NCS), and R 1 and R 2 are the same or different halide group.

3 . The electrolyte for a rechargeable lithium battery of claim 1 , wherein
L is a single bond, Z is an isocyanate group (—NCO) or an isothiocyanate group (—NCS), and R 1 and R 2 are each independently —F.

4 . The electrolyte for a rechargeable lithium battery of claim 1 , wherein
the additive includes a compound represented by Chemical Formula 2:

5 . The electrolyte for a rechargeable lithium battery of claim 1 , wherein
the additive is included in an amount of 0.05 wt % to 5 wt % based on the total amount of the electrolyte.

6 . The electrolyte for a rechargeable lithium battery of claim 1 , wherein
the additive is included in an amount of 0.1 wt % to 3 wt % based on the total amount of the electrolyte.

7 . A rechargeable lithium battery, comprising
a positive electrode including a positive electrode active material; a negative electrode including a negative electrode active material; and the electrolyte for the rechargeable lithium battery of claim 1 .

8 . The rechargeable lithium battery of claim 7 , wherein
the positive electrode active material includes a lithium nickel-based transition metal oxide selected from lithium nickel oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium nickel phosphate, or a combination thereof.

9 . The rechargeable lithium battery of claim 7 , wherein
the negative electrode active material includes a Si-based negative electrode active material or a Sn-based negative electrode active material.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Park Injun
• Kim Soojin
• Lee Junyong
• Lee Tae Jin
• Jeong Hyejeong
• TSAY Olga
• Choi Hyunbong
• Han Jungmin

Classifications

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/052

  Li-accumulators · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/525

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

• H01M4/386

  Silicon or alloys based on silicon · CPC title