# US 12,183,886 B2 · Electrolyte solution for lithium secondary battery and lithium secondary battery including the same

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- Number: US 12,183,886 B2
- Document ID: US12183886B2
- Status: Granted
- Kind: B2
- Application number: 17/454,205
- Filed: 2021-11-09
- Published: 2022-10-06
- Granted: 2024-12-31
- Earliest claimed: 2021-04-01
- Assignees: Hyundai Motor Company; Kia Corporation; The Industry & Academic Cooperation in Chungnam National University (IAC)
- Applicants: Hyundai Motor Company; Kia Corporation; The Industry & Academic Cooperation in Chungnam National University (IAC)
- Inventors: Jun Ki Rhee; Yoon Sung Lee; Sung Ho Ban; Seung Min Oh; Ko Eun Kim; Seung Wan Song; Gyeong Jun Chung
- Web page: https://patentgrep.com/patent/US12183886B2

## CPC

- H01M 10/052: Li-accumulators
- H01M 10/0567: characterised by the additives
- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0568: characterised by the solutes
- H01M 10/0569: characterised by the solvents
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- H01M 2300/0025: Organic electrolyte
- H01M 2300/0028: characterised by the solvent
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Disclosed are an electrolyte solution and an additive thereof, which may improve electrochemical properties of a lithium secondary battery.

## Claims

### Claim 1

An electrolyte solution for a lithium secondary battery comprising:
an electrolyte salt and an organic solvent,
wherein the electrolyte solution comprises a borate-based salt compound represented by the following Chemical Formula 1 as a first additive:
[Chemical Formula 1]
wherein the electrolyte solution further comprises a compound represented by the following Chemical Formula 2 as a second additive:
wherein the electrolyte solution comprises the first additive in an amount of about 1 to 2 wt %, based on a total weight of the electrolyte solution,
wherein the electrolyte solution comprises the second additive in an amount of about 1 to 2 wt %, based on the total weight of the electrolyte solution, and
wherein
R1 to R8 are independently of one another hydrogen, a halogen, or an alkyl group having 1 to 5 carbon atoms substituted with a halogen.

### Claim 2 (depends on 1)

The electrolyte solution for a lithium secondary battery of claim 1, wherein the borate-based salt compound is represented by the following Chemical Formula 1a:

### Claim 3 (depends on 1)

The electrolyte solution for a lithium secondary battery of claim 1, wherein the electrolyte salt comprises one or more selected from the group consisting of LiPF6, LiBF4, LiClO4, LiCl, LiBr, LiI, LiB10Cl10, LiCF3SO3, LiCF3CO2, Li(CF3SO2)3C, LiAsF6, LiSbF6, LiAlCl4, LiCH3SO3, LiCF3SO3, LiN(SO2C2F5)2, Li(CF3SO2)2N, LiC4F9SO3, LiB(C6H5)4, and Li(SO2F)2N (LiFSI).

### Claim 4 (depends on 1)

The electrolyte solution for a lithium secondary battery of claim 1, wherein a concentration of the electrolyte salt in the electrolyte solution is about 0.5 M to 1.0 M.

### Claim 5 (depends on 1)

The electrolyte solution for a lithium secondary battery of claim 1, wherein the organic solvent comprises one or more selected from the group consisting of carbonate-based solvents, ester-based solvents, ether-based solvents, and ketone-based solvents.

### Claim 6 (depends on 1)

A lithium secondary battery comprising: a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and the electrolyte solution of claim 1.

### Claim 7 (depends on 6)

The lithium secondary battery of claim 6, wherein the positive electrode is formed of a positive electrode active material including Ni, Co, and Mn.

### Claim 8 (depends on 7)

The lithium secondary battery of claim 7, wherein a ratio of Ni, Co, and Mn is about 8:1:1.

### Claim 9 (depends on 1)

A vehicle comprising an electrolyte solution of claim 1.

### Claim 10 (depends on 6)

A vehicle comprising a battery of claim 6.