# US 11,444,327 B2 · Electrolyte solution for lithium secondary batteries and lithium secondary battery including the same

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- Number: US 11,444,327 B2
- Document ID: US11444327B2
- Status: Granted
- Kind: B2
- Application number: 16/897,916
- Filed: 2020-06-10
- Published: 2021-06-17
- Granted: 2022-09-13
- Earliest claimed: 2019-12-13
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Applicants: Hyundai Motor Company; Kia Motors Corporation
- Inventors: Yoon Sung Lee; Ik Kyu Kim; Seung Min Oh; Young Woo Lee; Dong Jun Kim; Sung Ho Ban; Sung Hoon Lim
- Web page: https://patentgrep.com/patent/US11444327B2

## CPC

- H01M 10/0567: characterised by the additives
- C07C 205/57: having nitro groups and carboxyl groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- 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 4/587: for inserting or intercalating light metals
- 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
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

Disclosed are an electrolyte solution for lithium secondary batteries capable of increasing the lifetime of the lithium secondary batteries and a lithium secondary battery including the same. Provided is an electrolyte solution for lithium secondary batteries including a lithium salt, a solvent and allyl(4-nitrophenyl) carbonate.

## Claims

### Claim 1

An electrolyte solution for lithium secondary batteries comprising:
a lithium salt;
a solvent; and
a negative-electrode additive,
wherein the negative-electrode additive comprises allyl(4-nitrophenyl) carbonate represented by the following Formula 1

### Claim 2 (depends on 1)

The electrolyte solution for lithium secondary batteries according to claim 1, wherein the electrolyte solution comprises the negative-electrode additive in an amount of about 3.0% by weight or less with respect to the total weight of the electrolyte solution.

### Claim 3 (depends on 2)

The electrolyte solution for lithium secondary batteries according to claim 2, wherein the electrolyte solution comprises the negative-electrode additive in an amount of about 0.5 to 2.0% by weight with respect to the total weight of the electrolyte solution.

### Claim 4 (depends on 1)

The electrolyte solution for lithium secondary batteries according to claim 1, wherein the lithium salt comprises one or more selected from the group consisting of LiPF6, LiBF4, LiClO4, LiCl, LiBr, LiI, LiB10Cl10, LiCF3SO3, LiCF3CO2, LiAsF6, LiSbF6, LiAlCl4, CH3SO3Li, CF3SO3Li, LiN(SO2C2F5)2, Li(CF3SO2)2N, LiC4F9SO3, LiB(C6H5)4, Li(SO2F)2N (LiFSI) and (CF3SO2)2NLi.

### Claim 5 (depends on 1)

The electrolyte solution for lithium secondary batteries according to claim 1, wherein the solvent comprises one or more selected from the group consisting of carbonate solvents, ester solvents, ether solvents and ketone solvents.

### Claim 6 (depends on 1)

The electrolyte solution for lithium secondary batteries according to claim 1, further comprising a positive-electrode additive,
wherein the positive-electrode additive comprises LiPO2F2.

### Claim 7 (depends on 1)

A lithium secondary battery comprising the electrolyte solution according to claim 1.

### Claim 8 (depends on 7)

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

### Claim 9 (depends on 7)

The lithium secondary battery according to claim 7, wherein the lithium secondary battery has a discharge retention of about 94% or greater, measured after 200 cycles, each cycle including 0.5 C cc/cv charging and 0.5 C cc/cv discharging at 2.5 to 4.2V (cut-off) and at temperature of 45° C.

### Claim 10 (depends on 7)

A vehicle comprising the lithium secondary battery of claim 7.