Alkynyl-containing compound additive for non-aqueous electrolyte solution, and non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery which include the same

Patent metadata

Field	Value
Publication number	US-10923768-B2
Application number	US-201816086451-A
Country	US
Kind code	B2
Filing date	Jan 15, 2018
Priority date	Jan 23, 2017
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

The present invention relates to an additive for a non-aqueous electrolyte solution, which may suppress the generation of metallic foreign matter causing a side effect in a battery while forming a stable film on the surface of an electrode, a non-aqueous electrolyte solution for a lithium secondary battery which includes the additive, and a lithium secondary battery including the non-aqueous electrolyte solution.

First claim

The invention claimed is:

1. A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution comprising:
a lithium salt;
an organic solvent; and
an additive for a non-aqueous electrolyte solution, wherein the additive comprises at least one compound represented by Formulae 1 or 2:

wherein, in Formula 1 or 2,
R 1 and R 2 are each independently hydrogen, an alkyl group having 1 to 6 carbon atoms, or alkoxy having 1 to 6 carbon atoms,
R 3 is an alkylene group having 1 to 3 carbon atoms,
R 4 is hydrogen, an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 18 carbon atoms, a heterocycloalkyl group having 5 to 8 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, or an alkynyl group having 2 to 4 carbon atoms, wherein the alkyl group, the aryl group, the heterocycloalkyl group, the alkenyl group and the alkynyl group are not further substituted,
R 5 is an alkyl group having 2 to 4 carbon atoms which includes an ether group,
R 6 is hydrogen, an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 18 carbon atoms, a heterocycloalkyl group having 5 to 8 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, or an alkynyl group having 2 to 4 carbon atoms, and
n is an integer of 0 to 3,
wherein when R 4 is H or an aryl group having 6 carbon atoms, and n is 0, R 1 is not hydrogen, and
wherein when R 6 is an alkyl group having 1 to 6 carbon atoms, the alkyl group is not further substituted; and when R 6 is an aryl group having 6 to 18 carbon atoms, the aryl group is a phenyl group, a halophenyl group, a tolyl group, a naphthyl group, a trihalophenyl group, a trihalomethylphenyl group, an anthryl group, or a phenanthryl group, each of which is not further substituted.

2. The non-aqueous electrolyte solution for a lithium secondary battery of claim 1 , wherein in Formula 1,
R 1 is hydrogen or an alkyl group having 1 to 6 carbon atoms,
R 2 is hydrogen or alkoxy having 1 to 6 carbon atoms,
R 3 is an alkylene group having 1 to 3 carbon atoms,
R 4 is an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 18 carbon atoms, a heterocycloalkyl group having 5 to 8 carbon atoms, or an alkynyl group having 2 to 4 carbon atoms, each of which is not further substituted, and
n is an integer of 0 to 3.

3. The non-aqueous electrolyte solution for a lithium secondary battery of claim 1 , wherein in Formula 2,
R 5 is an alkyl group having 2 to 4 carbon atoms which includes an ether group, and R 6 is an alkyl group having 1 to 6 carbon atoms.

4. The non-aqueous electrolyte solution for a lithium secondary battery of claim 1 , wherein the additive for a non-aqueous electrolyte solution is included in an amount of 0.01 wt% to 10 wt% based on a total weight of the non-aqueous electrolyte solution.

5. The non-aqueous electrolyte solution for a lithium secondary battery of claim 4 , wherein the additive for a non-aqueous electrolyte solution is included in an amount of 0.5 wt% to 10 wt% based on the total weight of the non-aqueous electrolyte solution.

6. A lithium secondary battery comprising a negative electrode, a positive electrode, and a non-aqueous electrolyte solution,
wherein the non-aqueous electrolyte solution comprises the non-aqueous electrolyte solution for a lithium secondary battery of claim 1 .

7. A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution comprising:
a lithium salt;
an organic solvent; and
an additive for a non-aqueous electrolyte solution, wherein the additive comprises at least one compound represented by Formulae 1a to 1f:

8. A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution comprising:
a lithium salt;
an organic solvent; and
an additive for a non-aqueous electrolyte solution, wherein the additive comprises at least one compound represented by Formulae 2e or 2f:

Assignees

• Lg Chemical Ltd

Inventors

• Yu Sung Hoon
• Lee Kyung Mi
• Kim Shul Kee
• Lee Hyun Yeong
• Kang Yoo Sun

Classifications

• C07D309/10

  Oxygen atoms · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• C07C69/734

  Ethers · CPC title

• C07D303/04

  containing only hydrogen and carbon atoms in addition to the ring oxygen atoms · CPC title