Solid polymer electrolyte composition and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-9680181-B2
Application number	US-201414249999-A
Country	US
Kind code	B2
Filing date	Apr 10, 2014
Priority date	Feb 26, 2014
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

The present disclosure provides a solid polymer electrolyte composition including a polymer matrix, an organic solvent, and an additive agent containing polyhedral silsesquioxane, and also provides a lithium secondary battery including the same.

First claim

We claim:

1. A solid polymer electrolyte composition, comprising:
a polymer matrix having a molecular weight of about 8,000,000;
a lithium salt;
an organic solvent; and
an additive containing a polyhedral silsesquioxane represented by the following Chemical Formula 1:

wherein Chemical Formula 1, each of R 1 to R 8 independently represents CH 2 CH 2 (OCH 2 CH 2 ) m OCH 3 , and m represents a value of from 4 to 44, and
wherein a molar ratio between the ethylene oxide included in the polymer electrolyte composition and lithium from the lithium salt is 12:1.

2. The solid polymer electrolyte composition of claim 1 ,
wherein the average number of repetiting units of ethylene oxide included in R 1 to R 8 in Chemical Formula 1 is in the range of from about 4 to about 44.

3. The solid polymer electrolyte composition of claim 1 ,
wherein a content of the polyhedral silsesquioxane is in the range of from about 5 wt % to about 50 wt % with respect to a total weight of the solid polymer electrolyte composition.

4. The solid polymer electrolyte composition of claim 1 ,
wherein the polymer matrix includes a member selected from the group consisting of poly(ethylene oxide), poly(propylene oxide), poly(acrylonitrile), poly(vinyl chloride), poly(vinylidene fluoride), poly(methyl methacrylate), polysiloxane, polyphosphazene, and combinations thereof.

5. The solid polymer electrolyte composition of claim 1 ,
wherein the organic solvent is selected from the group consisting of carbonates, esters, ethers, ketones, nitriles, and combinations thereof.

6. The solid polymer electrolyte composition of claim 1 , wherein the lithium salt includes a member selected from the group consisting of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium chloride, lithium triflate, lithium hexafluoroarsenate, lithium sulfide , lithium sulfate, lithium phosphate, lithium citrate, lithium bis(oxalato)borate, lithium bis(nonafluorosulfonyl)methane, lithium difluoro bisoxalato phosphate, lithium difluoro(oxalato)borate, lithium bis(pentafluoroethylsulfonyl)amide, lithium bis(trifluoromethanesulfonyl)imide, lithium tris(trifluoromethanesulfonyl)methide, and combinations thereof.

7. A lithium secondary battery, comprising:
a solid polymer electrolyte composition according to claim 1 ;
a cathode; and
an anode.

8. The lithium secondary battery of claim 7 ,
wherein the cathode includes a member selected from the group consisting of LiMn 2 O 4 , LiNi 2 O 4 , LiTi 2 O 4 , LiTiS 2 , LiCoO 2 , LiNiO 2 , LiMnO 2 , Li 2 MnO 3 , LiFePO 4 , LiFePO 4 LiFePO 4 F, LiMnPO 4 , LiCoPO 4 , LiNiPO 4 , and combinations thereof.

9. The lithium secondary battery of claim 7 ,
wherein the anode includes a member selected from the group consisting of graphite, graphene, carbon fired at a low temperature, fired cokes, vanadium oxide, lithium vanadium oxide, lithium germanium oxide, lithium titanate oxide, silicon, silica, lithium silicide, and combinations thereof.

10. A polymer electrolyte composition, comprising:
a polymer matrix having a molecular weight of about 8,000,000;
a lithium salt;
an organic solvent; and
an additive containing a polyhedral silsesquioxane represented by the following Chemical Formula 1:

wherein Chemical Formula 1, each of R 1 to R 8 independently represents CH 2 CH 2 (OCH 2 CH 2 ) m OCH 3 , and m represents a value of 4 or 13; and,
wherein a molar ratio between the ethylene oxide included in the polymer electrolyte composition and lithium from the lithium salt is 12:1.

Assignees

• Univ Sogang Res Foundation

Inventors

• Rhee Hee-Woo
• Lee Jungmin
• Kim Eun Bee
• Kim Kwang Min

Classifications

• C08G77/045

  containing less than 25 silicon atoms · CPC title

• C08G77/14

  containing silicon bound to oxygen-containing groups · CPC title

• C08K3/105

  Compounds containing metals of Groups 1 to 3 or of Groups 11 to 13 of the Periodic Table · CPC title

• H01M10/0565 Primary

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

• C08L71/02

  Polyalkylene oxides · CPC title