Additive for electrolyte and electrolyte and lithium secondary battery

Patent metadata

Field	Value
Publication number	US-9583787-B2
Application number	US-201414281731-A
Country	US
Kind code	B2
Filing date	May 19, 2014
Priority date	Jul 2, 2013
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

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

R 1 to R 4 each independently being hydrogen or a non-polar hydrocarbon group, is disclosed. An electrolyte, the electrolyte being for a lithium secondary battery and including: a non-aqueous organic solvent; a lithium salt; and the additive is also disclosed. A lithium secondary battery including: a positive electrode; a negative electrode facing the positive electrode; and a separator between the positive electrode and the negative electrode, the separator being impregnated with an electrolyte including the additive, is also disclosed.

First claim

What is claimed is:

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

R 1 to R 4 each independently being hydrogen or a non-polar hydrocarbon group selected from the group consisting of an ethyl group, a propyl group, a butyl group, an isopropyl group, an isobutyl group, a C3 to C12 cycloalkyl group, a C6 to C20 aryl group, or a combination thereof.

2. The additive of claim 1 , wherein the non-polar hydrocarbon group is a C3 to C12 cycloalkyl group, a C6 to C20 aryl group, or a combination thereof.

3. The additive of claim 1 , wherein R 1 to R 4 is each independently hydrogen, an ethyl group, a propyl group, a butyl group, an isopropyl group, or an isobutyl group.

4. The additive of claim 1 , wherein each of R 1 and R 4 is hydrogen, and R 2 and R 3 are independently hydrogen, an ethyl group, a propyl group, a butyl group, an isopropyl group, or an isobutyl group.

5. The additive of claim 1 , wherein R 1 and R 4 are the same, and R 2 and R 3 are the same, or wherein R 1 and R 3 are the same, and R 2 and R 4 are the same.

6. The additive of claim 1 , wherein the additive is represented by Chemical Formulae 1a or 1c:

7. An electrolyte, the electrolyte being for a lithium secondary battery and comprising:
a non-aqueous organic solvent;
a lithium salt; and
an additive represented by Chemical Formula 1:

R 1 to R 4 each independently being hydrogen or a non-polar hydrocarbon group selected from the group consisting of an ethyl group, a propyl group, a butyl group, an isopropyl group, an isobutyl group, a C3 to C12 cycloalkyl group, a C6 to C20 aryl group, or a combination thereof.

8. The electrolyte of claim 7 , wherein the additive is present in the electrolyte in an amount in a range of about 0.001 to about 10 wt %, based on the total amount of the electrolyte.

9. The electrolyte of claim 8 , wherein the additive is present in the electrolyte in an amount in a range of about 0.1 to about 5 wt %, based on the total amount of the electrolyte.

10. The electrolyte of claim 7 , wherein the non-polar hydrocarbon group is a C3 to C12 cycloalkyl group, a C6 to C20 aryl group, or a combination thereof.

11. The electrolyte of claim 7 , wherein R 1 to R 4 is each independently hydrogen, an ethyl group, a propyl group, a butyl group, an isopropyl group, or an isobutyl group.

12. The electrolyte of claim 7 , wherein each of R 1 and R 4 is hydrogen, and R 2 and R 3 are independently hydrogen, an ethyl group, a propyl group, a butyl group, an isopropyl group, or an isobutyl group.

13. The electrolyte of claim 7 , wherein the additive is represented by Chemical Formulae 1a or 1c:

14. A lithium secondary battery comprising:
a positive electrode;
a negative electrode facing the positive electrode; and
a separator between the positive electrode and the negative electrode, the separator being impregnated with an electrolyte comprising an additive represented by Chemical Formula 1:

R 1 to R 4 each independently being hydrogen or a non-polar hydrocarbon group selected from the group consisting of an ethyl group, a propyl group, a butyl group, an isopropyl group, an isobutyl group, a C3 to C12 cycloalkyl group, a C6 to C20 aryl group, or a combination thereof.

15. The lithium secondary battery of claim 14 , wherein the additive is present in the electrolyte in an amount in a range of about 0.001 to about 10 wt %, based on the total amount of the electrolyte.

16. The lithium secondary battery of claim 14 , wherein the non-polar hydrocarbon group a C3 to C12 cycloalkyl group, a C6 to C20 aryl group, or a combination thereof.

17. The lithium secondary battery of claim 14 , wherein R 1 to R 4 is each independently hydrogen, an ethyl group, a propyl group, a butyl group, an isopropyl group, or an isobutyl group.

18. The lithium secondary battery of claim 14 , wherein each of R 1 and R 4 is hydrogen, and R 2 and R 3 are independently hydrogen, an ethyl group, a propyl group, a butyl group, an isopropyl group, or an isobutyl group.

19. The lithium secondary battery of claim 14 , wherein the additive is represented by Chemical Formulae 1a or 1c:

Assignees

• Samsung Sdi Co Ltd

Inventors

• Cho In-Haeng
• Shin Woo-Cheol
• Han Sang-Il
• Kim Sang-Hoon
• Chung Byung-Joo
• Kim Duck-Hyun
• Jeong Myung-Hwan
• Yu Jung-Yi
• Nam Jung-Hyun
• Lee Seung-Tae
• Bae Tae-Hyun
• Lee Mi-Hyun
• Lee Eon-Mi
• Lee Ha-Rim
• Kim Moon-Sung
• Cho E-Rang
• Choi Dong-Myung
• Shatunov Pavel Alexandrovich
• Tereshchenko Alexey
• Chernyshov Denis
• Khasanov Makhmut
• Egorov Vladimir

Classifications

• H01M10/0525

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

• H01M10/36

  Accumulators not provided for in groups H01M10/05-H01M10/34 · CPC title

• H01M10/052

  Li-accumulators · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M10/39

  working at high temperature · CPC title