Composition for gel polymer electrolyte and lithium secondary battery including gel polymer electrolyte formed therefrom

Patent metadata

Field	Value
Publication number	US-11967679-B2
Application number	US-201917291263-A
Country	US
Kind code	B2
Filing date	Nov 6, 2019
Priority date	Nov 6, 2018
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

The present invention relates to a composition for a gel polymer electrolyte, which includes a lithium salt, a non-aqueous organic solvent, a polymerization initiator, and an oligomer containing a polycarbonate-based repeating unit, a gel polymer electrolyte in which mechanical strength and ion transfer capability are improved by polymerization of the composition for a gel polymer electrolyte, and a lithium secondary battery in which external impact and stability during high-temperature storage are improved by including the gel polymer electrolyte.

First claim

The invention claimed is:

1. A composition for a gel polymer electrolyte, the composition comprising a lithium salt, a non-aqueous organic solvent, a polymerization initiator, and an oligomer,
wherein the oligomer comprises at least one selected from the group consisting of oligomers represented by Formula 1 and Formula 2:

wherein, in Formula 1,

R′ and R″ are each independently an aliphatic hydrocarbon group or an aromatic hydrocarbon group,
R 1 is a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms, a substituted or unsubstituted cycloalkylene group having 4 to 20 carbon atoms, a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, a substituted or unsubstituted heterocycloalkylene group having 2 to 20 carbon atoms, —CO—O—R—, where R is an alkylene group having 1 to 10 carbon atoms, —R o —CO—, where R o is an alkylene group having 1 to 10 carbon atoms, or —R i —O—R′ i —, where R i and R′ i are each independently a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms,
R 2 is —CO—O—R 3 —O—, where R 3 is a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms, a substituted or unsubstituted cycloalkylene group having 4 to 20 carbon atoms, a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, a substituted or unsubstituted heterocycloalkylene group having 2 to 20 carbon atoms, —CO—O—R—, where R is an alkylene group having 1 to 10 carbon atoms, —R j —CO—, where R j is an alkylene group having 1 to 10 carbon atoms, or —R k —O—R′ k —, where R k and R′ k are each independently a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms, or —R 4 —CO—O—, where R 4 is a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms, a substituted or unsubstituted cycloalkylene group having 4 to 20 carbon atoms, a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, or a substituted or unsubstituted heterocycloalkylene group having 2 to 20 carbon atoms),
R a , R b , R c , and R d are each independently hydrogen or an alkyl group having 1 to 3 carbon atoms,
n is an integer of 1 to 100, and
m is an integer of 1 to 100,
a and c are each independently an integer of 0 to 2, and
b and d are each independently an integer of 1 to 3:

wherein, in Formula 2,
R 5 , R 6 , R 7 , and R 8 are each independently a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms, a substituted or unsubstituted cycloalkylene group having 4 to 20 carbon atoms, a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, a substituted or unsubstituted heterocycloalkylene group having 2 to 20 carbon atoms, —CO—O—R m —, where R m is an alkylene group having 1 to 10 carbon atoms, —R n —CO—, where R n is an alkylene group having 1 to 10 carbon atoms, or —R 12 —O—R 13 —, where R 12 and R 13 are each independently a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms,
R 9 , R 10 , and R 11 are each independently an aliphatic hydrocarbon group or an aromatic hydrocarbon group,
R e , R f , R g , and R h are each independently hydrogen or an alkyl group having 1 to 3 carbon atoms,
o is an integer of 1 to 100,
p is an integer of 1 to 100, and
q is an integer of 1 to 100,
a1 and c1 are each independently an integer of 0 to 2, and
b1 and d1 are each independently an integer of 1 to 3.

2. The composition for a gel polymer electrolyte of claim 1 , wherein, in Formula 1,
R′ and R″ are aliphatic hydrocarbon groups,
R 1 is at least one selected from the group consisting of a substituted or unsubstituted alkylene group having 2 to 8 carbon atoms, a substituted or unsubstituted cycloalkylene group having 4 to 10 carbon atoms, a substituted or unsubstituted arylene group having 6 to 15 carbon atoms, a substituted or unsubstituted heterocycloalkylene group having 2 to 10 carbon atoms, —CO—O—R—, where R is an alkylene group having 2 to 8 carbon atoms, —R o —CO—, where R o is an alkylene group having 2 to 8 carbon atoms, and —R i —O—R′ i —, where R 1 and R′ i are each independently a substituted or unsubstituted alkylene group having 1 to 8 carbon atoms, and
R 2 is —CO—O—R 3 —O—, where R 3 is a substituted or unsubstituted alkylene group having 2 to 8 carbon atoms, a substituted or unsubstituted cycloalkylene group having 4 to 10 carbon atoms, a substituted or unsubstituted arylene group having 6 to 15 carbon atoms, a substituted or unsubstituted heterocycloalkylene group having 2 to 10 carbon atoms, —CO—O—R—, where R is an alkylene group having 1 to 10 carbon atoms, —R j —CO—, where R j is an alkylene group having 2 to 8 carbon atoms, or —R k —O—R′ k —, where R k and R′ k are each independently a substituted or unsubstituted alkylene group having 1 to 8 carbon atoms, or —R 4 —CO—O—, where R 4 is a substituted or unsubstituted alkylene group having 2 to 8 carbon atoms, a substituted or unsubstituted cycloalkylene group having 4 to 10 carbon atoms, a substituted or unsubstituted arylene group having 6 to 15 carbon atoms, or a substituted or unsubstituted heterocycloalkylene group having 2 to 10 carbon atoms.

3. The composition for a gel polymer electrolyte of claim 1 , wherein, in Formula 1,
R 1 is at least one selected from the group consisting of a propylene group, a butylene group, a pentylene group, a hexylene group, a cyclopentylene group, a cyclohexylene group, —CO—O—(CH 2 ) 5 —, —(CH 2 CH 2 OCH 2 CH 2 ) r —, where r is an integer of 1 to 10, and —(CH 2 ) 5 —CO—, and
R 2 is at least one selected from the group consisting of —CO—O—R 3 —O— (where R 3 is a propylene group, a butylene group, a pentylene group, a hexylene group, a cyclopentylene group, a cyclohexylene group, or —(CH 2 CH 2 OCH 2 CH 2 ) r1 , where r1 is an integer of 1 to 10, and —(CH 2 ) 5 —CO—O—.

4. The composition for a gel polymer electrolyte of claim 1 , wherein the oligomer represented by Formula 1 comprises at least one selected from the group consisting of compounds represented by Formula 1a to Formula 1c:

wherein, in Formula 1a,
n1 is an integer of 1 to 100, and
m1 is an integer of 1 to 100;

wherein, in Formula 1b,
n2 is an integer of 1 to 100, and
m2 is an integer of 1 to 100;

wherein, in Formula 1c,
n3 is an integer of 1 to 100, and
m3 is an integer of 1 to 100.

5. The composition for a gel polymer electrolyte of claim 1 , wherein, in Formula 2,
R 9 , R 10 , and R 11 are aliphatic hydrocarbon groups, and
R 5 , R 6 , R 7 , and R 8 are each independently at least one selected from the group consisting of a substituted or unsubstituted alkylene group having 2 to 8 carbon atoms, a substituted or unsubstituted cycloalkylene group having 4 to 10 carbon atoms, a substituted or unsubstituted arylene group having 6 to 15 carbon atoms, a substituted or unsubstituted heterocycloalkylene group having 2 to 10 carbon atoms, —CO—O—R m —, where R m is an alkylene group having 2 to 8 carbon atoms), —R n —CO—, where R n is an alkylene group having 2 to 8 carbon atoms, and —R 12 —O—R 13 —, where R 12 and R 13 are each independently a substituted or unsubstituted alkylene group having 1 to 8 carbon a

Assignees

• Lg Energy Solution Ltd

Inventors

• Ahn Kyoung Ho
• Lee Jung Hoon
• Shin Won Kyung
• Lee Jae Won
• Kim Min Jung
• Lee Chul Haeng

Classifications

• H01M10/0565 Primary

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• H01M10/0525 Primary

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

• H01M2300/0082

  Organic polymers · CPC title

• H01M2300/0085

  Immobilising or gelification of electrolyte · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title