Non-aqueous electrolyte solution for rechargeable battery, rechargeable battery having the same and method of preparing the same

Patent metadata

Field	Value
Publication number	US-10938070-B2
Application number	US-201916279894-A
Country	US
Kind code	B2
Filing date	Feb 19, 2019
Priority date	Feb 20, 2018
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

An electrolyte solution, a rechargeable battery including the same and a method of preparing the same are provided. The electrolyte solution includes an electrolytic salt having a concentration of greater than or equal to about 2.0 M (mol/L) and less than or equal to about 5.0 M (mol/L) with respect to the electrolyte solution and a cyclic carbonate-containing solvent. The cyclic carbonate-containing solvent includes a base solvent and a cyclic carbonate. The cyclic carbonate is included in an amount of about 1 volume % to about 15 volume % based on a total volume of the base solvent and the cyclic carbonate. The cyclic carbonate-containing 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 is from about 1% to about 25%.

First claim

What is claimed is:

1. A non-aqueous electrolyte solution for a rechargeable battery, comprising:
an electrolytic salt having a concentration of greater than or equal to about 2.0 M (mol/L) and less than or equal to about 5.0 M (mol/L) with respect to the electrolyte solution;
a cyclic carbonate-containing solvent; and
a poor solvent,
wherein the poor solvent has a solubility with respect to the electrolytic salt of less than or equal to about 1 g, and comprises at least one selected from trifluorotoluene (CF 3 Ph) and fluorobenzene (FB),
wherein:
the cyclic carbonate-containing solvent comprises a base solvent and a cyclic carbonate;
the cyclic carbonate is included in an amount of about 1 volume % to about 15 volume % based on a total volume of the base solvent and the cyclic carbonate;
the cyclic carbonate-containing 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; and
a peak area ratio of the free solvent determined by a Raman spectrum is greater than or equal to about 1% and less than or equal to about 25%.

2. The non-aqueous electrolyte solution of claim 1 , wherein the electrolytic salt has a concentration of greater than or equal to about 2.3 M (mol/L) and less than or equal to about 3.0 M (mol/L).

3. The non-aqueous electrolyte solution of claim 1 , wherein the cyclic carbonate comprises at least one selected from ethylene carbonate (EC), vinylene carbonate (VC), and fluoroethylene carbonate (FEC).

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

5. The non-aqueous electrolyte solution of claim 1 , wherein the peak area ratio of the free solvent is greater than or equal to about 3% and less than or equal to about 20%.

6. A rechargeable battery, comprising:
the non-aqueous electrolyte solution of claim 1 .

7. The rechargeable battery of claim 6 , wherein the electrolytic salt has a concentration of greater than or equal to about 2.3 M (mol/L) and less than or equal to about 3.0 M (mol/L).

8. The rechargeable battery of claim 6 , wherein the cyclic carbonate comprises at least one selected from ethylene carbonate (EC), vinylene carbonate (VC), and fluoroethylene carbonate (FEC).

9. The rechargeable battery of claim 6 , wherein the electrolytic salt comprises a lithium salt.

10. The rechargeable battery of claim 6 , wherein the peak area ratio of the free solvent is greater than or equal to about 3% and less than or equal to about 20%.

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

Assignees

• Samsung Sdi Co Ltd

Inventors

• Yamamoto Hidekazu
• Mizumo Tomonobu
• Kawase Kenichi

Classifications

• H01M10/0569 Primary

  characterised by the solvents · CPC title

• H01M10/0525

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

• H01M2300/0034

  Fluorinated solvents · CPC title

• H01M2300/0037

  Mixture of solvents · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title