Electrolyte for lithium secondary battery and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-9343778-B2
Application number	US-201213431512-A
Country	US
Kind code	B2
Filing date	Mar 27, 2012
Priority date	Mar 30, 2011
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

An electrolyte for a lithium secondary battery, the electrolyte including a lithium salt, a non-aqueous organic solvent, and an additive represented by Formula 1 below:

wherein CY1 and R 1 through R 7 are the same as defined above; and
a lithium secondary battery containing the electrolyte.

First claim

What is claimed is:

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

wherein
CY1 is an aromatic heterocyclic ring or a ring-connected C4-C6 non-aromatic heterocyclic ring; and
R 1 through R 7 are each independently hydrogen, a cyano group, —OR (R is a C1-C10 alkyl group or a C6-C20 aryl group), —C(═O)R a , —C(═O)OR a , —OCO(OR a ), —(X) n —NH 2 (X is a C1-C10 alkyl group or a C1-C10 alkoxy group, n is an integer of 0 to 10), —C═N(R a ), —SR a , —S(═O)R a , —S(═O) 2 R a , a substituted or non-substituted C1-C20 alkyl group, a substituted or non-substituted C1-C20 alkoxy group, a substituted or non-substituted C2-C20 alkenyl group, a substituted or non-substituted C2-C20 alkynyl group, a C2-C20 alkylene oxide group, a substituted or non-substituted C3-C30 cycloalkyl group, a substituted or non-substituted C6-C30 aryl group, a substituted or non-substituted C6-C30 aryloxy group, a substituted or non-substituted C6-C30 heteroaryl group, or combinations thereof,
wherein R a is hydrogen, a C1-C10 alkyl group, or a C6-C20 aryl group and
wherein at least one of R 1 to R 7 includes a polar functional group selected from the group consisting of a cyano group, —OR (R is a C1-C10 alkyl group or a C6-C20 aryl group), —C(═O)R a , —C(═O)OR a , —OCO(OR a ), —(X) n —NH 2 (X is a C1-C10 alkyl group or a C1-C10 alkoxy group, n is an integer of 0 to 10), —C═N(R a ), —SR a , —S(═O)R a , and —S(═O) 2 R a .

2. The electrolyte of claim 1 , wherein the additive is represented by Formula 2 below:

wherein R′ 1 through R′ 7 are each independently hydrogen, a cyano group, —OR (R is a C1-C10 alkyl group or a C6-C20 aryl group), —C(═O)R a , —C(═O)OR a , —(X) n —NH 2 (X is a C1-C5 alkyl group or a C1-C5 alkoxy group, n is an integer of 0 to 5), —C═N(R a ), —SR a , —S(═O)R a , —S(═O) 2 R a , a substituted or non-substituted C1-C20 alkyl group, a substituted or non-substituted C1-C20 alkoxy group, a substituted or non-substituted C2-C20 alkenyl group, a substituted or non-substituted C2-C20 alkynyl group, a substituted or non-substituted C3-C30 cycloalkyl group, a substituted or non-substituted C6-C30 aryl group, a substituted or non-substituted C6-C30 aryloxy group, a substituted or non-substituted C6-C30 heteroaryl group, or combinations thereof,
wherein R a is hydrogen, a C1-C10 alkyl group, or a C6-C20 aryl group and
wherein at least one of R′ 1 to R′ 7 include a polar functional group selected from the group consisting of a cyano group, —OR (R is a C1-C10 alkyl group or a C6-C20 aryl group), —C(═O)R a , —C(═O)OR a , —OCO(OR a ), —(X) n —NH 2 (X is a C1-C10 alkyl group or a C1-C10 alkoxy group, n is an integer of 0 to 10), —C═N(R a ), —SR a , —S(═O)R a , and —S(═O) 2 R a .

3. The electrolyte of claim 2 , wherein at least one of R′ 1 to R′ 7 is —(CH 2 ) n —NH 2 or —(CH 2 O) n —NH 2 where n is an integer of 1 to 5.

4. The electrolyte of claim 2 , wherein at least one of R′ 1 to R′ 7 is S(═O) 2 (C n H 2n+1 ) where n is an integer of 1 to 5, —S(═O) 2 C 6 H 5 , or —S(═O) 2 CH 2 C 6 H 5 .

5. The electrolyte of claim 1 , wherein the additive is represented by Formula 3 below:

wherein
CY2 is a ring selected from the group consisting of a benzene ring, a naphthalene ring, a phenanthrene ring, an anthracene ring, a pyrene ring, a perylene ring, a cyclopentane ring, a cycloheptane ring, and derivatives thereof; and
R″ 1 to R″ 7 are each independently hydrogen, —OR (R is a C1-C10 alkyl group or a C6-C20 aryl group), —C(═O)R a , —C(═O)OR a , —(X) n —NH 2 (X is a C1-05 alkyl group or a C1-05 alkoxy group, n is an integer of 0 to 5), —C═N(R a ), —SR a , —S(═O)R a , —S(═O) 2 R a , a substituted or non-substituted C1-C20 alkyl group, a substituted or non-substituted C1-C20 alkoxy group, a substituted or non-substituted C2-C20 alkenyl group, a substituted or non-substituted C2-C20 alkynyl group, a substituted or non-substituted C3-C30 cycloalkyl group, a substituted or non-substituted C6-C30 aryl group, a substituted or non-substituted C6-C30 aryloxy group, a substituted or non-substituted C6-C30 heteroaryl group, or combinations thereof,
wherein R a is hydrogen, a C1-C10 alkyl group, or a C6-C20 aryl group.

6. The electrolyte of claim 1 , wherein the additive comprises at least one selected from the group consisting of

7. The electrolyte of claim 1 , wherein the additive comprises at least one selected from the group consisting of

8. The electrolyte of claim 1 , wherein the amount of the additive is in a range of about 0.01 to about 10 wt % based on a total weight of the electrolyte.

9. The electrolyte of claim 8 , wherein the amount of the additive is in a range of about 0.01 to about 5 wt % based on a total weight of the electrolyte.

10. The electrolyte of claim 9 , wherein the amount of the additive is in a range of about 0.01 to about 1 wt % based on a total weight of the electrolyte.

11. The electrolyte of claim 1 , wherein the lithium salt is one selected from the group consisting of LiPF 6 , LiBF 4 , LiSbF 6 , LiAsF 6 , LiCF 3 SO 3 , Li(CF 3 SO 2 ) 3 C, Li(CF 3 SO 2 ) 2 N, LiC 4 F 9 SO 3 , LiClO 4 , LiAlO 4 , LiAlCl 4 , LiBPh 4 , LiN(C x F 2x+1 SO 2 )(C x F 2y+1 SO 2 ) where x and y are natural numbers, LiCl, LiI, lithium bisoxalate borate (LIBOB), and combinations thereof.

12. The electrolyte of claim 1 , wherein the non-aqueous organic solvent is a carbonate-based solvent, an ester-based solvent, an ether-based solvent, a ketone-based solvent, an alcohol-based solvent, a non-protonic solvent, or combinations thereof.

13. A lithium secondary battery comprising:
a positive electrode comprising a positive active material into or from which lithium ions are intercalated or deintercalated;
a negative electrode comprising a negative active material into or from which lithium ions are intercalated or deintercalated; and
an electrolyte interposed between the positive electrode and the negative electrode,
wherein the electrolyte comprises a lithium salt, a non-aqueous organic solvent, and an additive represented by Formula 1 below:

wherein
CY1 is an aromatic heterocyclic ring or a ring-connected C4-C6 non-aromatic heterocyclic ring; and
R 1 through R 7 are each independently hydrogen, a cyano group, —OR (R is a C1-C10 alkyl group or a C6-C20 aryl group), —C(═O)R a , —C(═O)OR a , —OCO(OR a ), —(X) n —NH 2 (X is a C1-C10 alkyl group or a C1-C10 alkoxy group, n is an integer of 0 to 10), —C═N(R a ), —SR a , —S(═O)R a , —S(═O) 2 R a , a substituted or non-substituted C1-C20 alkyl group, a substituted or non-substituted C1-C20 alkoxy group, a substituted or non-substituted C2-C20 alkenyl group, a substituted or non-substituted C2-C20 alkynyl group, a C2-C20 alkylene oxide group, a substituted or non-substituted C3-C30 cycloalkyl group, a substituted or non-substituted C6-C30 aryl group, a substituted or non-substituted C6-C30 aryloxy group, a subs

Assignees

• Mun Jun-Young
• Kang Yoon-Sok
• Park Jin-Hwan
• Park Min-Sik
• Samsung Electronics Co Ltd

Inventors

• Mun Jun-Young
• Kang Yoon-Sok
• Park Jin-Hwan
• Park Min-Sik

Classifications

• H01M10/0568

  characterised by the solutes · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/052

  Li-accumulators · CPC title