Composite electrolyte for lithium metal battery, preparing method thereof, and lithium metal battery comprising the same

Patent metadata

Field	Value
Publication number	US-10930970-B2
Application number	US-201616300029-A
Country	US
Kind code	B2
Filing date	Sep 28, 2016
Priority date	Jun 14, 2016
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

Disclosed are a composite electrolyte, including: a network web formed of a fiber containing a polymer and inorganic particles, wherein a content of the inorganic particles is 5 wt % or less based on a total weight of the composite electrolyte, a preparing method thereof, and a lithium metal battery including the same.

First claim

The invention claimed is:

1. A composite electrolyte for a lithium metal battery, comprising:
a network web formed of a fiber containing a polymer and inorganic particles, and a lithium salt,
wherein a content of the inorganic particles is 1 wt % to 5 wt % based on a total weight of the composite electrolyte,
the polymer is polyethylene oxide,
the inorganic particles are each TiO 2 , and
the lithium salt is lithium bis(trifluoromethanesulfonyl) imide (LiTFSI).

2. A composite electrolyte for a lithium metal battery, comprising:
a network web formed of a fiber containing a polymer and inorganic particles; and
a lithium salt,
wherein a content of the inorganic particles is 1 wt % to 5 wt % based on a total weight of the composite electrolyte,
the polymer is polyethylene oxide,
the inorganic particles are at least one selected from SiO 2 , TiO 2 , ZnO, Al 2 O 3 , BaTiO 3 , and cage-structured silsesquioxane, and
the lithium salt is at least one selected from lithium bis(trifluoromethanesulfonyl) imide (LiTFSI), LiSCN, LiN(CN) 2 , LiClO 4 , LiBF 4 , LiAsF 6 , LiPF 6 , LiCF 3 SO 3 , LiN(SO 2 C 2 F 5 ) 2 , LiN(SO 2 CF 3 ) 2 , LiN(SO 2 F) 2 , LiSbF 6 , LiPF 3 (CF 2 CF 3 ) 3 , LiPF 3 (CF 3 ) 3 , and LiB(C 2 O 4 ) 2 .

3. The composite electrolyte of claim 2 ,
wherein the polymer has a weight average molecular weight of 400,000 to 1,000,000.

4. The composite electrolyte of claim 2 ,
wherein the inorganic particles have an average particle diameter of 15 nm to 25 nm.

5. The composite electrolyte of claim 2 ,
wherein the fiber has an average particle diameter of 500 nm to 5 μm.

6. The composite electrolyte of claim 2 ,
wherein the composite electrolyte has a thickness of 5 μm to 30 μm.

7. The composite electrolyte of claim 2 ,
wherein the composite electrolyte has a hardness of 0.01 GPa to 1 GPa at 25° C. and an elastic modulus of 0.1 GPa to 10 GPa at 25° C.

8. The composite electrolyte of claim 2 ,
wherein the cage-structured silsesquioxane is represented by Formula 1:
Si k O 1.5k (R 1 ) a (R 2 ) b (R 3 ) c   [Formula 1]

wherein, in Formula 1, R 1 , R 2 , and R 3 are each independently a hydrogen, a substituted or unsubstituted C1-C30 alkyl group, a substituted or unsubstituted C1-C30 alkoxy group, a substituted or unsubstituted C2-C30 alkenyl group, a substituted or unsubstituted C2-C30 alkynyl group, a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C6-C30 aryloxy group, a substituted or unsubstituted C2-C30 heteroaryl group, a substituted or unsubstituted C4-C30 carbocyclic group, or a silicon-containing functional group; and
a, b, and c are each an integer of 1 to 20, and a, b, and c are selected such that the sum thereof (k=a+b+c) satisfies 6≤k≤20.

9. The composite electrolyte of claim 8 ,
wherein the cage-structured silsesquioxane is represented by at least one of Formula 2 or Formula 3:

wherein in Formulae 2 and 3, R 1 to R 8 are each independently the same as described in connection with R 1 to R 3 in Formula 1.

10. A lithium metal battery, comprising:
a positive electrode;
a negative electrode; and
the composite electrolyte of claim 2 interposed between the positive electrode and the negative electrode.

11. A method of preparing the composite electrolyte of claim 2 , comprising:
preparing a composition comprising the polymer, the inorganic particles, and an organic solvent; and
electrospinning the composition.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Seok Hoon
• Nam Junghyun
• Jeon Bokkyu
• Choi Yeonjoo

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2300/0091

  in the form of mixtures · CPC title

• H01M10/0565

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

• H01M10/056 Primary

  characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes · CPC title

• H01M10/052 Primary

  Li-accumulators · CPC title