Non-aqueous electrolyte including additive for non-aqueous electrolyte, and lithium secondary battery including the non-aqueous electrolyte

Patent metadata

Field	Value
Publication number	US-11978857-B2
Application number	US-202217956064-A
Country	US
Kind code	B2
Filing date	Sep 29, 2022
Priority date	Sep 30, 2021
Publication date	May 7, 2024
Grant date	May 7, 2024

Abstract

The present disclosure provides a non-aqueous electrolyte including an additive for a non-aqueous electrolyte represented by Formula 1 below:

wherein, R 1 to R 5 may each independently be any one selected from the group consisting of H, an alkenyl group having 2 to 20 carbon atoms, an alkynyl group having 2 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, a cycloalkenyl group having 3 to 12 carbon atoms, and a nitrile group.

First claim

What is claimed is:

1. A non-aqueous electrolyte comprising an additive represented by Formula 1:

wherein in Formula 1, R 1 to R 5 are each,
wherein the additive is included in a content of 0.01 parts by weight to 5 parts by weight based on 100 parts by weight of the non-aqueous electrolyte.

2. The non-aqueous electrolyte of claim 1 , further comprising a lithium salt selected from LiCl, LiBr, LiI, LiBF 4 , LiClO 4 , LiB 10 Cl 10 , LiAlCl 4 , LiAlO 2 , LiPF 6 , LiCF 3 SO 3 , LiCH 3 CO 2 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiCH 3 SO 3 , LiN(SO 2 F) 2 , LiN(SO 2 CF 2 CF 3 ) 2 , LiN(SO 2 CF 3 ) 2 , or a combination thereof.

3. The non-aqueous electrolyte of claim 2 , wherein the lithium salt is LiPF 6 .

4. The non-aqueous electrolyte of claim 3 , wherein the LiPF 6 is included at a concentration of 0.5 M to 4 M.

5. The non-aqueous electrolyte of claim 1 , further comprising an organic solvent.

6. The non-aqueous electrolyte of claim 5 , wherein the organic solvent comprises at least one of a cyclic carbonate organic solvent, a linear carbonate organic solvent, a linear ester organic solvent, or a cyclic ester organic solvent.

7. The non-aqueous electrolyte of claim 6 , wherein the cyclic carbonate organic solvent comprises at least one of ethylene carbonate (EC), propylene carbonate (PC), 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 2,3-pentylene carbonate, or vinylene carbonate.

8. The non-aqueous electrolyte of claim 6 , wherein the linear carbonate organic solvent comprises at least one of dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate, ethylmethyl carbonate (EMC), methylpropyl carbonate, or ethylpropyl carbonate.

9. The non-aqueous electrolyte of claim 6 , wherein the linear ester-organic solvent comprises at least one of methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, or butyl propionate.

10. The non-aqueous electrolyte of claim 6 , wherein the cyclic ester-organic solvent comprises at least one of γ-butyrolactone, γ-valerolactone, γ-caprolactone, σ-valerolactone, or ε-caprolactone.

11. The non-aqueous electrolyte of claim 5 , wherein the organic solvent comprises a cyclic carbonate organic solvent, a linear carbonate organic solvent, or a combination thereof.

12. The non-aqueous electrolyte of claim 1 , further comprising one or more of a cyclic carbonate compound, a halogen-substituted carbonate compound, a sultone compound, a sulfate compound, a phosphate compound, a borate compound, a nitrile compound, a benzene compound, an amine compound, a silane compound, or a lithium salt compound as an additive.

13. A lithium secondary battery comprising a positive electrode comprising a positive electrode active material, a negative electrode comprising a negative electrode active material, a separator interposed between the positive electrode and the negative electrode, and the non-aqueous electrolyte of claim 1 .

Assignees

• Lg Energy Solution Ltd

Inventors

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

Classifications

• H01M10/0569

  characterised by the solvents · 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

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title