Additive for electrolyte, electrolyte including additive, and lithium secondary battery including electrolyte

Patent metadata

Field	Value
Publication number	US-12230757-B2
Application number	US-202016801893-A
Country	US
Kind code	B2
Filing date	Feb 26, 2020
Priority date	Mar 27, 2019
Publication date	Feb 18, 2025
Grant date	Feb 18, 2025

Abstract

An additive for electrolytes includes a compound represented by Formula 1. The silyl moieties at both ends of the compound may coordinate water to suppress or reduce hydrolysis of LiPF 6 , and may also form a SEI film capable of improving battery performance. Additional embodiments of the present disclosure provide an electrolyte including the additive; and a lithium secondary battery including the electrolyte.

First claim

What is claimed is:

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

wherein in Formula 1,
R 1 to R 6 are each independently selected from:
a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, and a tert-butyl group; and
a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, and a tert-butyl group, each being substituted with at least one selected from deuterium and a halogen,
R 7 is selected from:
a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, and a tert-butyl group, each being substituted with at least one deuterium,
wherein the additive is included at about 0.5 parts by weight to about 5 parts by weight based on 100 parts by weight of the electrolyte.

2. The electrolyte for a lithium secondary battery of claim 1 , wherein R 1 to R 3 are identical to each other.

3. The electrolyte for a lithium secondary battery of claim 1 , wherein R 4 to R 6 are identical to each other.

4. The electrolyte for a lithium secondary battery of claim 1 , wherein R 1 to R 6 are identical to each other.

5. A lithium secondary battery comprising:
a cathode;
an anode; and
the electrolyte for a lithium secondary battery of claim 1 between the cathode and the anode.

6. The lithium secondary battery of claim 5 , wherein the cathode comprises a nickel-based cathode active material.

7. An electrolyte for a lithium secondary battery, the electrolyte comprising:
a lithium salt;
a non-aqueous solvent; and
an additive comprising Compound 1:

wherein the additive is included at about 0.5 parts by weight to about 5 parts by weight based on 100 parts by weight of the electrolyte,
wherein the lithium salt is LiPF 6 , and
wherein the non-aqueous solvent comprises at least one selected from among dimethyl carbonate, diethyl carbonate, ethylmethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethyl propyl carbonate, ethylene carbonate, propylene carbonate, and butylene carbonate.

8. A lithium secondary battery comprising:
a cathode;
an anode; and
the electrolyte of claim 7 between the cathode and the anode.

9. The lithium secondary battery of claim 8 , wherein the cathode comprises a nickel-based cathode active material.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Park Hyejin
• TSAY Olga
• Woo Myungheui
• Lee Harim
• Lim Jinhyeok
• Choi Hyunbong

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · 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