Electrolyte solution for lithium secondary battery and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-11670801-B2
Application number	US-202117337974-A
Country	US
Kind code	B2
Filing date	Jun 3, 2021
Priority date	Oct 28, 2020
Publication date	Jun 6, 2023
Grant date	Jun 6, 2023

Abstract

The electrolyte solution for a lithium secondary battery includes: a lithium salt; a solvent; and an anode additive including 1-benzyl-5-(4-nitrophenyl)-1H-1,2,3-triazole-4-carbonitrile represented by Chemical Formula 1 below:

First claim

What is claimed is:

1. An electrolyte solution for a lithium secondary battery, the electrolyte solution comprising:
an electrolyte salt;
an organic solvent; and
an additive comprising 1-benzyl-5-(4-nitrophenyl)-1H-1,2,3-triazole-4-carbonitrile represented by Chemical Formula 1 below:

2. The electrolyte solution of claim 1 , wherein an amount of the 1-benzyl-5-(4-nitrophenyl)-1H-1,2,3-triazole-4-carbonitrile is 0.5 wt % to 1.5 wt % based on a total weight of the electrolyte solution.

3. The electrolyte solution of claim 1 , wherein the additive further comprises vinyl chloride (VC) in an amount of 0.5 wt % to 3.0 wt % based on a total weight of the electrolyte solution.

4. The electrolyte solution of claim 1 , wherein the electrolyte salt is any one compound or a mixture of two or more compounds 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.

5. The electrolyte solution of claim 1 , wherein the organic solvent is any one substance or a mixture of two or more substances selected from a group consisting of a carbonate-based solvent, an ester-based solvent, an ether-based solvent, and a ketone-based solvent.

6. A lithium secondary battery comprising an electrolyte solution, wherein the electrolyte solution comprises:
an electrolyte salt;
an organic solvent; and
an additive comprising 1-benzyl-5-(4-nitrophenyl)-1H-1,2,3-triazole-4-carbonitrile represented by Chemical Formula 1 below:

7. The lithium secondary battery of claim 6 , further comprising:
a cathode comprising a cathode active material containing Ni, Co and Mn;
an anode comprising a carbon (C)-based anode active material; and
a separator interposed between the cathode and the anode.

8. The lithium secondary battery of claim 7 , wherein the lithium secondary battery is configured to exhibit a discharge retention of 84.6% or more after 50 cycles under conditions of a discharge end voltage of 2.5 V, a charge end voltage of 4.2 V, a temperature of 45° C. during charging and discharging, and a C-rate of 1 C.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Ulsan Nat Inst Science & Tech Unist

Inventors

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

Classifications

• H01M10/052

  Li-accumulators · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M2300/0037

  Mixture of solvents · 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