Positive electrode for Zn—Br battery (ZBB) and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-11355756-B2
Application number	US-202016842597-A
Country	US
Kind code	B2
Filing date	Apr 7, 2020
Priority date	Aug 30, 2019
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

Provided are a positive electrode for a Zn—Br battery, a Zn—Br battery including the same, and a method of manufacturing the positive electrode for a Zn—Br battery. The positive electrode for a Zn—Br battery includes a carbon body doped with pyridinic nitrogen. The Zn—Br battery includes a negative electrode including a transition metal coated with zinc, the positive electrode; and an electrolyte. A pH of the electrolyte is in a range of 1.5 to 5.

First claim

What is claimed is:

1. A positive electrode for a Zn—Br battery comprising a porous carbon body substrate and a carbon body doped with pyridinic nitrogen, wherein a surface of the porous carbon body substrate is coated with the carbon body doped with pyridinic nitrogen.

2. The positive electrode for a Zn—Br battery of claim 1 , wherein the Zn—Br battery is a membraneless flowless Zn—Br battery.

3. The positive electrode for a Zn—Br battery of claim 1 , wherein the carbon body doped with pyridinic nitrogen is a microporous carbon body comprising micropores.

4. The positive electrode for a Zn—Br battery of claim 3 , wherein the micropore has an average pore size of 0.2 to 3 nm.

5. The positive electrode for a Zn—Br battery of claim 1 , wherein the pyridinic nitrogen is present at 30 atom % or more with respect to the total nitrogen content of the nitrogen-doped carbon body.

6. The positive electrode for a Zn—Br battery of claim 1 , wherein the pyridinic nitrogen is positively charged pyridinic nitrogen.

7. The positive electrode for a Zn—Br battery of claim 1 , wherein the porous carbon body substrate and the carbon body doped with pyridinic nitrogen are integrated with each other.

8. The positive electrode for a Zn—Br battery of claim 1 , wherein adsorption energies of the carbon body doped with pyridinic nitrogen and brominated anions satisfy the following Expression 1:
E Ad-CN /E Ad-C >5  [Expression 1]

(Wherein E Ad-CN represents an adsorption energy of a carbon body doped with pyridinic nitrogen and brominated anions, and E Ad-C represents an adsorption energy of a carbon body and brominated anions).

9. A Zn—Br battery comprising:
a negative electrode comprising a transition metal coated with zinc;
the positive electrode selected according to claim 1 ; and
an electrolyte,
wherein a pH of the electrolyte is in a range of 1.5 to 5.

10. The Zn—Br battery of claim 9 , wherein a drop in open circuit voltage of the Zn—Br battery lasts for 40 hours or more.

11. The Zn—Br battery of claim 9 , wherein the Zn—Br battery has an energy efficiency of 70% or more for 1,000 charge/discharge cycles.

12. A method of manufacturing the positive electrode for a Zn—Br battery of claim 1 , comprising:
(S1) subjecting a porous carbon body substrate to hydrophilic surface treatment;
(S2) immersing the hydrophilized porous carbon body substrate in a solution including a metal precursor and an organic ligand precursor;
(S3) drying the immersed porous carbon body substrate to coat the porous carbon body substrate with nanocrystalline polyhedrons including metal-organic frameworks (MOFs); and
(S4) carbonizing the porous carbon body substrate coated with the nanocrystalline polyhedrons.

13. The method of claim 12 , wherein the metal-organic frameworks are zeolitic-imidazolate frameworks (ZIFs).

14. The method of claim 12 , wherein the carbonization process of the step (S4) is performed at 500 to 1,200° C.

15. The method of claim 12 , wherein the hydrophilic surface treatment process of the step (S1) is performed at 400 to 800° C. under an oxidizing atmosphere.

16. The positive electrode for a Zn—Br battery of claim 1 , wherein the porous carbon body substrate is carbon felt, carbon paper or carbon cloth.

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Kim Hee-Tak
• Kim Sang Ouk
• Lee Juhyuk
• Byun Year In

Classifications

• H01M8/0234

  Carbonaceous material · CPC title

• H01M2300/0005

  Acid electrolytes · CPC title

• H01M4/60 Primary

  of organic compounds · CPC title

• H01M4/96 Primary

  Carbon-based electrodes · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title