Sodium ion storage material

Patent metadata

Field	Value
Publication number	US-11217818-B2
Application number	US-201816633164-A
Country	US
Kind code	B2
Filing date	Jul 25, 2018
Priority date	Jul 27, 2017
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

The present disclosure relates to a sodium-ion storage material and an electrode material for a sodium-ion battery, an electrode material for a seawater battery, an electrode for a sodium-ion battery, an electrode for a seawater battery, a sodium-ion battery, and a seawater battery, which include the sodium-ion storage material. Specifically, the sodium-ion storage material may include one or more materials selected from the group consisting of CuxS, FeS, FeS2, Ni3S, NbS2, SbOx, SbSx, SnS and SnS2, wherein 0<x≤2. When the sodium-ion storage material according to the present disclosure is used, it may exhibit high discharge capacity, and when the sodium-ion storage material is applied to a sodium-ion battery which is a secondary battery, it may exhibit excellent charge/discharge cycle characteristics.

First claim

The invention claimed is:

1. A sodium-ion battery comprising:
an electrode comprising electrode materials comprising CU x S (0<x≤2) as an electrode active material; and
an electrolyte obtained by dissolving sodium hexafluorophosphate (NaPF 6 ) in ether-based solvent,
wherein the sodium-ion battery is charged or discharged by intercalation and conversion reaction of Na and Cu x S.

2. The sodium-ion battery of claim 1 , wherein the electrode materials are particles having a size of 1 nm to 500 μm.

3. The sodium-ion battery of claim 2 , wherein the electrode materials have one or more shapes selected from the group consisting of nanoplates, nanospheres, nanowires, hollow nanospheres, nanoboxes, nanodots and nanotubes.

4. The sodium-ion battery of claim 3 , wherein the electrode materials have a nanoplate shape.

5. The sodium-ion battery of claim 4 , wherein the nanoplates have a polygonal plate shape.

6. The sodium-ion battery of claim 5 , wherein the nanoplates have a hexagonal plate shape.

7. The sodium-ion battery of claim 4 , wherein the electrode materials are those in which two nanoplates are oriented to cross each other.

8. The sodium-ion battery of claim 7 , wherein the first nanoplate of the two nanoplates is oriented along the {001} plane, and the second nanoplate is oriented along the {100} plane.

9. The sodium-ion battery of claim 4 , wherein the nanoplates have a diameter of 100 nm to 1000 nm.

10. The sodium-ion battery of claim 4 , wherein the nanoplates have a thickness between 10 nm and 100 nm.

11. The sodium-ion battery of claim 1 , wherein the electrode active material is coated with one or more selected from the group consisting of conductive carbon, precious metals, and metals.

12. The sodium-ion battery of claim 1 , wherein the electrode material further comprises a binder.

13. The sodium-ion battery of claim 12 , wherein the binder comprises one or more selected from the group consisting of polyvinylidene fluoride, polyvinyl alcohol, polyacrylic acid, alginic acid, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, an ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene-butylene rubber, and fluorinated rubber.

14. The sodium-ion battery of claim 1 , wherein the electrode material further comprises a conductive material.

15. A seawater battery comprising:
an electrode comprising electrode materials comprising Cu x S (0<x≤2) as an electrode active material; and
an electrolyte obtained by dissolving sodium hexafluorophosphate (NaPF 6 ) in ether-based solvent,
wherein the seawater battery is charged or discharged by intercalation and conversion reaction of Na and Cu x S.

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Yuk Jong Min
• Park Jae Yeol
• Kim Sung Joo

Classifications

• H01M4/663

  containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres · CPC title

• C01G3/12

  Sulfides · CPC title

• C01P2004/24

  Nanoplates, i.e. plate-like particles with a thickness from 1-100 nanometer · CPC title

• H01M4/049

  Manufacturing of an active layer by chemical means · CPC title

• H01M10/054 Primary

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title