Electrolyte solution for lithium secondary batteries and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-11749838-B2
Application number	US-202117394927-A
Country	US
Kind code	B2
Filing date	Aug 5, 2021
Priority date	Nov 6, 2020
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

Disclosed are an electrolyte solution for lithium secondary batteries and a lithium secondary battery including the same.The electrolyte solution for lithium secondary batteries includes: a lithium salt; a solvent; and a functional additive, wherein the functional additive includes a first positive-electrode film additive, which is 2-(2′((tert-butoxycarbonyl)amino)ethoxy)-ethyl p-methylbenzenesulfonate, represented by the following Formula 1:

First claim

What is claimed is:

1. An electrolyte solution for lithium secondary batteries, the electrolyte solution comprising:
a lithium salt;
a solvent; and
a functional additive,
wherein the functional additive comprises a first positive-electrode film additive, which is 2-(2′((tert-butoxycarbonyl)amino)ethoxy)-ethyl p-methylbenzenesulfonate, represented by the following Formula 1:

2. The electrolyte solution according to claim 1 , wherein the first positive-electrode film additive is added in an amount of 0.5 to 2.0% by weight or less with respect to a weight of the electrolyte solution.

3. The electrolyte solution according to claim 1 , wherein the functional additive further comprises at least one of:
a first negative-electrode film additive which is vinylene carbonate (VC),
a second negative-electrode film additive which is fluoroethylene carbonate (FEC), or
a second positive-electrode film additive which is LiPO 2 F 2 .

4. The electrolyte solution according to claim 3 , wherein the functional additive selected from at least one of the first negative-electrode film additive, the second negative-electrode film additive, or the second positive-electrode film additive is added in an amount of 0.5 to 3.0% by weight with respect to a weight of the electrolyte solution.

5. The electrolyte solution according to claim 1 , wherein the lithium salt comprises at least one compound selected from a group consisting of LiPF 6 , LiBF 4 , LiClO 4 , LiCl, LiBr, LiI, LiB 10 Cl 10 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, LiN(SO 2 C 2 F 5 ) 2 , Li(CF 3 SO 2 ) 2 N, LiC 4 F 9 SO 3 , LiB(C 6 H 5 ) 4 , Li(SO 2 F) 2 N (LiFSI) and (CF 3 SO 2 ) 2 NLi.

6. The electrolyte solution according to claim 1 , wherein the solvent comprises at least one substance selected from a group consisting of carbonate solvents, ester solvents, ether solvents and ketone solvents.

7. A lithium secondary battery comprising an electrolyte solution comprising:
a lithium salt;
a solvent; and
a functional additive,
wherein the functional additive comprises a first positive-electrode film additive, which is 2-(2′((tert-butoxycarbonyl)amino)ethoxy)-ethyl p-methylbenzenesulfonate, represented by the following Formula 1:

8. The lithium secondary battery according to claim 7 , further comprising:
a positive electrode including a positive-electrode active material containing Ni, Co and Mn;
a negative electrode including a negative-electrode active material selected from a carbon (C)-based material or a silicon (Si)-based material; and
a separator interposed between the positive electrode and the negative electrode.

9. The lithium secondary battery according to claim 8 , wherein the positive electrode includes a Ni content of 80% by weight or more.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Ulsan Nat Inst Science & Tech Unist
• Unist Ulsan National Insitute Of Science And Tech

Inventors

• Kim Ko Eun
• Ban Sung Ho
• Lee Yoon Sung
• Oh Seung Min
• Kim Ik Kyu
• Kwak Sang Kyu
• Choi Nam Soon
• Hong Sung You
• Kim Woo Gyum
• Hwang Dae Yeon
• Moon Hyeon Gyu

Classifications

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/0525 Primary

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

• H01M10/0568

  characterised by the solutes · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title