# US 11,444,328 B2 · Non-aqueous electrolyte for secondary battery, secondary battery having the same and method of manufacturing the same

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- Number: US 11,444,328 B2
- Document ID: US11444328B2
- Status: Granted
- Kind: B2
- Application number: 16/279,888
- Filed: 2019-02-19
- Published: 2019-08-22
- Granted: 2022-09-13
- Earliest claimed: 2018-02-20
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Hidekazu Yamamoto; Tomonobu Mizumo; Kenichi Kawase
- Web page: https://patentgrep.com/patent/US11444328B2

## 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 2300/0037: Mixture of solvents
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY

## Abstract

A non-aqueous electrolyte for secondary battery, secondary battery having the same and a method of manufacturing the same are provided. The non-aqueous electrolyte includes an electrolytic salt having an electrolytic salt concentration of about 0.5 M (mol/L) to about 3.8 M (mol/L) in the non-aqueous electrolyte, a first solvent having a solubility of the electrolytic salt in a range from about 100 g to about 400 g, and a second solvent having a solubility of the electrolytic salt of less than or equal to about 1 g. The first solvent includes a coordination solvent coordinated with an ionized ion from the electrolytic salt and a free solvent that is not coordinated with an ionized ion from the electrolytic salt, and a peak area ratio of the free solvent determined by a Raman spectrum is less than about 20%.

## Claims

### Claim 1

A non-aqueous electrolyte for a secondary battery, comprising:
an electrolytic salt, a first solvent, and a second solvent,
wherein:
the electrolytic salt is included at a concentration of about 1.7 M (mol/L) to about 3.0 M (mol/L) in the non-aqueous electrolyte,
the first solvent has a solubility of the electrolytic salt in a range from about 100 g to about 400 g,
the second solvent has a solubility of the electrolytic salt of less than or equal to about 1 g;
the first solvent comprises a coordination solvent coordinated with an ionized ion from the electrolytic salt and a free solvent not coordinated with an ionized ion from the electrolytic salt;
wherein the second solvent is trifluorotoluene (CF3Ph);
an amount of the first solvent, an amount of the second solvent, and the concentration of the electrolytic salt together provide a viscosity of the non-aqueous electrolyte of 3.8 mPa·s to 22 mPa·s; and
a peak area ratio of the free solvent determined by a Raman spectrum is less than about 20%.

### Claim 2 (depends on 1)

The non-aqueous electrolyte of claim 1, wherein the electrolytic salt comprises a lithium salt.

### Claim 3 (depends on 1)

The non-aqueous electrolyte of claim 1, wherein the first solvent comprises at least one selected from dimethyl carbonate (DMC), ethyl acetate (EA), methyl propionate (MP), and methyl acetate (MA).

### Claim 4 (depends on 1)

The non-aqueous electrolyte of claim 1, wherein the peak area ratio of the free solvent is greater than or equal to about 1%.

### Claim 5 (depends on 1)

The non-aqueous electrolyte of claim 1, wherein the peak area ratio of the free solvent is in a range from about 3% to about 15%.

### Claim 6 (depends on 1)

A method of manufacturing a secondary battery, comprising:
providing the non-aqueous electrolyte of claim 1 to an electrode assembly of the secondary battery.

### Claim 7 (depends on 1)

The non-aqueous electrolyte of claim 1, wherein the electrolytic salt is included at a concentration of about 1.9 M (mol/L) to about 2.7 M (mol/L) in the non-aqueous electrolyte.

### Claim 8 (depends on 1)

A secondary battery comprising the non-aqueous electrolyte for a secondary battery of claim 1.

### Claim 9 (depends on 8)

The secondary battery of claim 8, wherein the electrolytic salt comprises a lithium salt.

### Claim 10 (depends on 8)

The secondary battery of claim 8, wherein the first solvent comprises at least one selected from dimethyl carbonate (DMC), ethyl acetate (EA), methyl propionate (MP), and methyl acetate (MA).

### Claim 11 (depends on 8)

The secondary battery of claim 8, wherein the peak area ratio of the free solvent is greater than or equal to about 1%.

### Claim 12 (depends on 8)

The secondary battery of claim 8, wherein the peak area ratio of the free solvent is in a range from about 3% to about 15%.

### Claim 13 (depends on 8)

The secondary battery of claim 8, wherein the secondary battery is a lithium ion secondary battery.