Non-aqueous electrolyte for secondary battery, secondary battery having the same and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-11444328-B2
Application number	US-201916279888-A
Country	US
Kind code	B2
Filing date	Feb 19, 2019
Priority date	Feb 20, 2018
Publication date	Sep 13, 2022
Grant date	Sep 13, 2022

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%.

First claim

What is claimed is:

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 (CF 3 Ph);
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%.

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

3. 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).

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

5. 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%.

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

7. 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.

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

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

10. 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).

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

12. 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%.

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

Assignees

• Samsung Sdi Co Ltd

Inventors

• Yamamoto Hidekazu
• Mizumo Tomonobu
• Kawase Kenichi

Classifications

• H01M10/0569 Primary

  characterised by the solvents · CPC title

• H01M2300/0091

  in the form of mixtures · CPC title

• H01M2300/0037

  Mixture of solvents · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2300/0042

  Four or more solvents · CPC title