# US 12,015,120 B2 · Additive, electrolyte for rechargeable lithium battery, and rechargeable lithium battery

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- Number: US 12,015,120 B2
- Document ID: US12015120B2
- Status: Granted
- Kind: B2
- Application number: 16/927,116
- Filed: 2020-07-13
- Published: 2021-01-21
- Granted: 2024-06-18
- Earliest claimed: 2019-07-18
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Hyunbong Choi; Younghye Kang; Dongyoung Kim; Soojin Kim; Aeran Kim; Suyeol Ryu; Jeongmin Shin; Junyong Lee; Tae Jin Lee; Jin-Hyeok Lim; Myunghwan Jeong; Wonseok Cho; Pavel Shatunov; Jungmin Han
- Web page: https://patentgrep.com/patent/US12015120B2

## CPC

- H01M 10/0567: characterised by the additives
- 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 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0569: characterised by the solvents
- H01M 4/382: {Lithium (H01M4/405 takes precedence)}
- H01M 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive electrodes}
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop
- 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

An additive, an electrolyte for a rechargeable lithium battery, and a rechargeable lithium battery, the additive being represented by Chemical Formula 1:

## Claims

### Claim 1

An electrolyte for a rechargeable lithium battery, the electrolyte comprising:
a non-aqueous organic solvent,
a lithium salt, and
an additive represented by Chemical Formula 1:
wherein, in Chemical Formula 1,
X1 and X2 are each independently O, S, CRaRb, or NRc, at least one of X1 and X2 being O or S,
R1 is a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C3 to C10 cycloalkenyl group, or a substituted or unsubstituted C6 to C20 aryl group,
Ra, Rb, Rc, and R2 to R5 are each independently hydrogen, a substituted or unsubstituted C1 to C5 alkyl group, a substituted or unsubstituted C2 to C5 alkenyl group, or a combination thereof, and
n is an integer selected from 1 to 3.

### Claim 2 (depends on 1)

The electrolyte as claimed in claim 1, wherein the additive is included in the electrolyte in an amount of 0.1 wt % to 10 wt %, based on a total weight of the electrolyte for the rechargeable lithium battery.

### Claim 3 (depends on 1)

The electrolyte as claimed in claim 1, wherein the additive is included in the electrolyte in an amount of 0.1 wt % to 3.0 wt %, based on a total weight of the electrolyte for the rechargeable lithium battery.

### Claim 4 (depends on 1)

The electrolyte as claimed in claim 1, wherein n is 2 or 3.

### Claim 5 (depends on 1)

The electrolyte as claimed in claim 1, wherein at least one of X1 and X2 is S.

### Claim 6 (depends on 1)

The electrolyte as claimed in claim 1, wherein R1 is a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C3 to C10 cycloalkenyl group, or a substituted or unsubstituted C6 to C20 aryl group.

### Claim 7 (depends on 1)

The electrolyte as claimed in claim 1, wherein the additive represented by Chemical Formula 1 is represented by Chemical Formula 1A:
wherein, in Chemical Formula 1A, X1, X2, and R1 to R5 are defined the same as those of Chemical Formula 1.

### Claim 8 (depends on 1)

The electrolyte as claimed in claim 1, wherein the additive represented by Chemical Formula 1 is represented by one of Chemical Formula 1-1 to Chemical Formula 1-3:
wherein, in Chemical Formula 1-1 to Chemical Formula 1-3, le to R5 and n are defined the same as those of Chemical Formula 1.

### Claim 9 (depends on 1)

The electrolyte as claimed in claim 1, wherein R1 of Chemical Formula 1 is an unsubstituted C1 alkyl group, a substituted or unsubstituted C2 to C10 alkyl group or a substituted or unsubstituted C2 to C5 alkenyl group.

### Claim 10 (depends on 1)

A rechargeable lithium battery, comprising:
a positive electrode comprising a positive active material;
a negative electrode comprising a negative active material; and
the electrolyte as claimed in claim 1.

### Claim 11 (depends on 10)

The rechargeable lithium battery as claimed in claim 10, wherein the positive active material includes a composite oxide including cobalt, manganese, nickel, or a combination thereof, and lithium.

### Claim 12 (depends on 10)

The rechargeable lithium battery as claimed in claim 10, wherein the positive active material is represented by Chemical Formula 2:
LiaM11−y1−z1M2y1M3z1O2 [Chemical Formula 2]
wherein, in Chemical Formula 2,
0.9≤a≤1.8, 0≤y1<1, 0≤z1<1, 0≤y1+z1<1, and M1, M2, and M3 are each independently Ni, Co, Mn, Al, Sr, Mg, La, or a combination thereof.

### Claim 13 (depends on 10)

The rechargeable lithium battery as claimed in claim 10, wherein the additive is included in the electrolyte in an amount of 0.1 wt % to 10 wt %, based on a total weight of the electrolyte for the rechargeable lithium battery.

### Claim 14 (depends on 10)

The rechargeable lithium battery as claimed in claim 10, wherein the additive is included in the electrolyte in an amount of 0.1 wt % to 3.0 wt %, based on a total weight of the electrolyte for the rechargeable lithium battery.