Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-12512513-B2
Application number	US-202117787727-A
Country	US
Kind code	B2
Filing date	Feb 22, 2021
Priority date	Feb 21, 2020
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

Abstract

A non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery including the same are disclosed herein. In some embodiments, a non-aqueous electrolyte for a lithium secondary battery includes a lithium salt, an organic solvent, and an additive comprising a compound represented by the following Chemical Formula 1:

wherein Q is a single bond, or a substituted or non-substituted C1-C10 alkyl group, and each of A1, A2 and A3 independently represents hydrogen (H) or a substituted or non-substituted C1-C10 alkyl group. The non-aqueous electrolyte can scavenge decomposition products of lithium salt to maintain passivation of an SEI film during high-temperature storage. The non-aqueous electrolyte improves battery performance by improving self-discharge phenomenon caused by elution from a positive electrode and breakage of the SEI film at a negative electrode. The battery has improved initial efficiency by formation of an initial coating film to inhibit additional electrolyte decomposition.

First claim

What is claimed is:

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

wherein Q is a single bond, or a substituted or non-substituted C1-C10 alkylene group, and each of A1, A2 and A3 independently represents hydrogen (H) or a non-substituted C1-C10 alkyl group.

2 . The non-aqueous electrolyte for a lithium secondary battery according to claim 1 , wherein Q is a linear or branched alkylene.

3 . The non-aqueous electrolyte for a lithium secondary battery according to claim 2 , wherein at least one hydrogen atom of the linear or branched alkylene is substituted with a halogen atom selected from Cl, F, Br or I.

4 . The non-aqueous electrolyte for a lithium secondary battery according to claim 1 , wherein the additive comprises a compound represented by Chemical Formula 1a:

5 . The non-aqueous electrolyte for a lithium secondary battery according to claim 1 , wherein the lithium salt comprises Li + , as a cation, and at least one of F − , Cl − , Br − , I − , NO 3 − , N(CN) 2 − , BF 4 − , ClO 4 − , AlO 4 − , AlCl 4 − , PF 6 − , SbF 6 − , AsF 6 − , B 10 Cl 10 − , BF 2 C 2 O 4 − , BC 4 O 8 − , PF 4 C 2 O 4 − , PF 2 − C 4 O 8 − , (CF 3 ) 2 PF 4 − , (CF 3 ) 3 PF 3 − , (CF 3 ) 4 PF 2 − , (CF 3 ) 5 PF − , (CF 3 ) 6 P − , CF 3 SO 3 − , C 4 F 9 SO 3 − , CF 3 CF 2 SO 3 − , (CF 3 SO 2 ) 2 N − , (FSO 2 ) 2 N − , CF 3 CF 2 (CF 3 ) 2 CO − , (CF 3 SO 2 ) 2 CH, CH 3 SO 3 − , CF 3 (CF 2 ) 7 SO 3 − , CF 3 CO 2 − , CH 3 CO 2 − , PO 2 F 2 − , SCN − or (CF 3 CF 2 SO 2 ) 2 N − , as an anion.

6 . The non-aqueous electrolyte for a lithium secondary battery according to claim 1 , wherein the additive is present in an amount of 0.1 wt % to 2 wt % based on 100 wt % of the non-aqueous electrolyte.

7 . The non-aqueous electrolyte for a lithium secondary battery according to claim 1 , wherein the additive is present in an amount of 0.3 wt % to 1.5 wt % based on 100 wt % of the non-aqueous electrolyte.

8 . A lithium secondary battery, comprising:
a positive electrode; a negative electrode; a separator; and the non-aqueous electrolyte of claim 1 .

Assignees

• Lg Energy Solution Ltd

Inventors

• Kim Hyun-Seung
• An Yu-Ha
• Oh Jeong-Woo
• Lee Chul-Haeng

Classifications

• H01M10/0568

  characterised by the solutes · CPC title

• H01M50/46

  Separators, membranes or diaphragms characterised by their combination with electrodes · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M10/52

  Removing gases inside the secondary cell, e.g. by absorption (vent plugs or other mechanical arrangements for facilitating escape of gases H01M50/30) · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title