# US 2021/0242503 A1 · Electrolyte solutions

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- Number: US 2021/0242503 A1
- Document ID: US20210242503A1
- Status: Published application
- Kind: A1
- Application number: 17/162,987
- Filed: 2021-01-29
- Published: 2021-08-05
- Earliest claimed: 2020-01-31
- Assignees: Ascend Performance Materials Operations LLC
- Applicants: Ascend Performance Materials Operations LLC
- Inventors: Jefferson Thomas Ebert; Benjamin Haseltine
- Web page: https://patentgrep.com/patent/US20210242503A1

## CPC

- H01M 10/0569: characterised by the solvents
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0567: characterised by the additives
- H01M 10/0568: characterised by the solutes
- H01M 2300/0034: Fluorinated solvents
- 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 electrolyte solution comprising an ionic component, a base solvent, and an additive package. The additive package comprises a trinitrile compound and a cyclic carbonate. The electrolyte solution comprises symmetric linear carbonate in an amount greater than 19 wt %, based on the total weight of the electrolyte solution.

## Claims

### Claim 1

An electrolyte solution comprising:
an ionic component;
a base solvent, optionally comprising symmetric linear carbonate; and
an additive package comprising:
a trinitrile compound having a chemical structure CxH2x−1(CN)3, wherein x is from 4 to 10; and
a cyclic carbonate compound having a chemical structure:
wherein R1, R2 R3, R4, R5, and R6 are independently selected from hydrogen, halogen, (C1-C10)alkyl, or (C1-C10) haloalkyl,
wherein the electrolyte solution comprises symmetric linear carbonate in an amount greater than 19 wt %, based on the total weight of the electrolyte solution.

### Claim 2 (depends on 1)

The electrolyte solution of claim 1, wherein the symmetric linear carbonate comprises diethyl carbonate, or dimethyl carbonate, or combinations thereof, and wherein the diethyl carbonate, or dimethyl carbonate, or combinations thereof is present in an amount greater than 19%, based on the total weight of the electrolyte solution.

### Claim 3 (depends on 1)

The electrolyte solution of claim 1, wherein the cyclic carbonate compound comprises vinylene carbonate or ethylene carbonate or combinations thereof.

### Claim 4 (depends on 1)

The electrolyte solution of claim 1, wherein the cyclic carbonate compound comprises fluoroethylene carbonate.

### Claim 5 (depends on 1)

The electrolyte solution of claim 1, wherein the electrolyte solution comprises less than 30 wt % cyclic carbonate.

### Claim 6 (depends on 1)

The electrolyte solution of claim 1, wherein the electrolyte solution comprises less than 30 wt % ethylene carbonate.

### Claim 7 (depends on 1)

The electrolyte solution of claim 1, wherein the electrolyte solution comprises less than 6 wt % FEC.

### Claim 8 (depends on 1)

The electrolyte solution of claim 1, wherein the electrolyte solution further comprises asymmetric linear carbonates in an amount less than 50 wt %.

### Claim 9 (depends on 1)

The electrolyte solution of claim 1, wherein the electrolyte solution further comprises ethylmethyl carbonate in an amount less than 50 wt %.

### Claim 10 (depends on 1)

The electrolyte solution of claim 1, wherein the trinitrile compound comprises tricyanohexane.

### Claim 11 (depends on 1)

The electrolyte solution of claim 1, wherein a weight ratio of the cyclic carbonate compound to the trinitrile compound is from 0.5:1 to 5:1.

### Claim 12 (depends on 1)

The electrolyte solution of claim 1, wherein the additive package further comprises a sulfonate.

### Claim 13 (depends on 1)

The electrolyte solution of claim 1, wherein the trinitrile compound comprises tricyanohexane, wherein the carbonate compound comprises vinylidene carbonate, and wherein the solution demonstrates a voltage drop of less than 0.25 V.

### Claim 14 (depends on 1)

The electrolyte solution of claim 1, further comprising methylene methane disulfonate or fluoroethylene carbonate or combinations thereof.

### Claim 15 (depends on 1)

The electrolyte solution of claim 1, wherein the electrolyte solution exhibits a first cycle coulombic efficiency greater than 0.85 over 20 cycles.

### Claim 16 (depends on 1)

The electrolyte solution of claim 1, wherein the electrolyte solution exhibits an impedance growth of less than 20% over 25 cycles.

### Claim 17

An electrolyte solution comprising:
an ionic component;
a base solvent; and
an additive package comprising:
a trinitrile compound having a chemical structure CxH2x−1(CN)3, wherein x is from 4 to 10; and
a sulfonate compound having a chemical structure:
wherein a and b are independently from 1 to 4,
wherein the electrolyte solution comprises symmetric linear carbonates in an amount greater than 19 wt %, based on the total weight of the electrolyte solution.

### Claim 18 (depends on 17)

The electrolyte solution of claim 17, wherein the trinitrile compound comprises tricyanohexane.

### Claim 19

A secondary cell comprising:
a cathode, optionally having a cathode active material comprising a lithium-containing transition metal composite oxide;
an anode optionally comprising graphite; and
an electrolyte solution comprising:
an ionic component;
a base solvent; and
an additive package comprising:
a trinitrile compound having a chemical structure CxH2x−1(CN)3, wherein x is from 4 to 10; and
a cyclic carbonate compound having a chemical structure:
wherein R1, R2 R3, R4, R5, and R6 are independently selected from hydrogen, halogen, (C10-C10)alkyl, or (C1-C10)haloalkyl,
wherein the electrolyte solution comprises symmetric linear carbonate in an amount greater than 19 wt %, based on the total weight of the electrolyte solution.

### Claim 20 (depends on 19)

The secondary cell of claim 19, wherein the cell demonstrates a 5 day gas generation value of less than 4.9 mL when operated at 4.48 volts.