Cathode electrode material and lithium sulfur battery using the same

Patent metadata

Field	Value
Publication number	US-10270103-B2
Application number	US-201815871079-A
Country	US
Kind code	B2
Filing date	Jan 15, 2018
Priority date	Jul 17, 2015
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

A cathode electrode material and a lithium sulfur battery are disclosed. The cathode electrode material includes a sulfur containing cathode active material, a conducting agent, and a cathode binder. The cathode binder includes a polymer obtained by polymerizing a dianhydride monomer with a diamine monomer. The lithium sulfur battery includes an anode electrode, an electrolyte, and a cathode electrode.

First claim

What is claimed is:

1. A cathode electrode material comprising a sulfur containing cathode active material, a conducting agent, and a cathode binder, wherein the cathode binder comprises a polymer obtained by polymerizing a dianhydride monomer with a diamine monomer, the dianhydride monomer is represented by formula III, the diamine monomer comprises a first monomer represented by formula IV,

wherein the R in formula III is selected from the group consisting of bisphenol A unit, —S—, and —CH 2 —.

2. The cathode electrode material of claim 1 , wherein the dianhydride monomer is 4,4′-(4,4′-isopropylidenediphenoxy)bis(phthalic anhydride).

3. The cathode electrode material of claim 1 , wherein the diamine monomer further comprises a second monomer represented by formula V,

wherein the R 4 is a bivalent organic substituent.

4. The cathode electrode material of claim 3 , wherein the R 4 in formula V is selected from the group consisting of —(CH 2 ) n —, —O—, —S—, —CH 2 —O—CH 2 —, —CH(NH)—(CH 2 ) n —,

5. The cathode electrode material of claim 3 , wherein a molar ratio of the first monomer to the second monomer is 1:2 to 10:1.

6. The cathode electrode material of claim 3 , wherein a molar ratio of the first monomer to the second monomer is 1:1 to 3:1.

7. The cathode electrode material of claim 1 , wherein a molar ratio of the dianhydride monomer to the diamine monomer is 1:10 to 10:1.

8. The cathode electrode material of claim 1 , wherein a molar ratio of the dianhydride monomer to the diamine monomer is 1:2 to 4:1.

9. The cathode electrode material of claim 1 , wherein a molecular weight of the polymer is in a range from about 1000 to about 50000.

10. The cathode electrode material of claim 1 , wherein a mass percentage of the cathode binder is in a range from about 0.01% to about 50%.

11. The cathode electrode material of claim 1 , wherein a mass percentage of the cathode binder is in a range from about 1% to about 20%.

12. The cathode electrode material of claim 1 , wherein the sulfur containing cathode active material is at least one of elemental sulfur and sulfur based polymer.

13. The cathode electrode material of claim 12 , wherein the sulfur based polymer is a product formed from a pyrolysis reaction, dehydrogenation and carbonation reaction, dehydration reaction, dehydrochlorination reaction, or deamination reaction of a mixture of conducting polymer and elemental sulfur.

14. The cathode electrode material of claim 12 , wherein the sulfur based polymer is selected from the group consisting of sulfurized poly(pyridinopyridine), sulfurized polystyrene, sulfurized polyoxyethylene, sulfurized polyvinyl alcohol, sulfurized poly(vinylidene chloride), sulfurized poly(vinylidene difluoride), sulfurized polyvinylchloride, sulfurized polyvinyl fluoride, sulfurized poly(1,2-dichloroethylene), sulfurized poly(1,2-difluoroethylene), sulfurized polymethyl methacrylate, sulfurized phenolic resin, and combinations thereof.

15. A cathode electrode material comprising a sulfur containing cathode active material, a conducting agent, and a cathode binder, wherein the cathode binder comprises a polymer obtained by polymerizing a dianhydride monomer with a diamine monomer, the dianhydride monomer comprises a monomer selected from the group consisting of monomers represented by formulas I, II, III, and combinations thereof, the diamine monomer comprises a first monomer represented by formula IV and a second monomer represented by formula V,

wherein the R 4 in formula V is selected from the group consisting of —(CH 2 ) n —, —S—, —CH 2 —O—CH 2 —, —CH(NH)—(CH 2 ) n —,

and the R in formula III is a bivalent organic substituent.

16. The cathode electrode material of claim 15 , wherein the R in formula III is selected from the group consisting of bisphenol A unit, —O—, —S—, and —CH 2 —.

17. An electrode slurry comprising a solvent, a sulfur containing cathode active material, a conducting agent, and a cathode binder mixed together,
wherein the cathode binder comprises a polymer obtained by polymerizing a dianhydride monomer with a diamine monomer at a temperature from about 160° C. to about 200° C., the dianhydride monomer comprises a monomer selected from the group consisting of monomers represented by formulas I, II, III, and combinations thereof, the diamine monomer comprises a first monomer represented by formula IV,

wherein the R in formula III is a bivalent organic substituent.

18. The electrode slurry of claim 17 , wherein the R in formula III is selected from the group consisting of bisphenol A unit, —O—, —S—, and —CH 2 —.

19. The electrode slurry of claim 17 , wherein the diamine monomer further comprises a second monomer represented by formula V,

wherein the R 4 in formula V is selected from the group consisting of —(CH 2 ) n —, —O—, —S—, —CH 2 —O—CH 2 —, —CH(NH)—(CH 2 ) n —,

Assignees

• Univ Tsinghua

Inventors

• He xiang-ming
• Qian guan-nan
• Wang Li

Classifications

• H01M4/622 Primary

  being polymers · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M4/623 Primary

  fluorinated polymers · CPC title

• H01M10/0525

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

• H01M10/0565

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