Zinc-iodine battery structure

Patent metadata

Field	Value
Publication number	US-11165084-B2
Application number	US-201816764860-A
Country	US
Kind code	B2
Filing date	Oct 16, 2018
Priority date	Nov 17, 2017
Publication date	Nov 2, 2021
Grant date	Nov 2, 2021

Abstract

Disclosed in the invention is a zinc-iodine battery structure, which includes a housing, a cavity is formed in the housing, and a cation exchange membrane for dividing the cavity into two parts is disposed in a middle of the cavity; a glass fiber component for protecting the cation exchange membrane is disposed at a negative output end; a graphite felt impregnated with a ZnI2 solution is disposed on an outside of the glass fiber component; and the graphite felt of the negative output end is coated with Bi powder, and a graphite felt of a positive output end is coated with Sm powder. Carbon plates serving as current leading-out channels of a battery are disposed on outsides of the graphite felts; and a return flow channel is disposed between the two graphite felts. By using a homogeneous cation exchange membrane with a low electrical resistance, a problem of serious self-discharging is overcome; and by using a flow battery with an open flow system, a problem of a change in pressure caused by a change in volume during charging and discharging is effectively solved. By disposing glass fiber products on two sides of the cation exchange membrane, a dendritic crystal generated during charging is unable to reach a separator, so that short circuit caused by puncture of the separator is avoided.

First claim

What is claimed is:

1. A zinc-iodine battery structure, comprising a housing, a cavity being formed in the housing, wherein a cation exchange membrane for dividing the cavity into two parts is disposed in a middle of the cavity; a glass fiber component for protecting the cation exchange membrane is disposed at a negative output end; a graphite felt impregnated with a ZnI 2 solution is disposed on an outside of the glass fiber component; the graphite felt of the negative output end is evenly coated with Bi powder less than 300 meshes, and a graphite felt of a positive output end is coated with Sm powder less than 300 meshes; carbon plates serving as current leading-out channels of a battery are disposed on outsides of the graphite felts; a return flow channel is disposed between the two graphite felts; and the return flow channel has a length-diameter ratio greater than 10 and a diameter ranging between 0.5 mm and 1.5 mm.

2. The zinc-iodine battery structure according to claim 1 , wherein the housing of the battery is made of PVC plastic.

3. The zinc-iodine battery structure according to claim 1 , wherein the cation exchange membrane is a homogeneous cation exchange membrane.

4. The zinc-iodine battery structure according to claim 1 , wherein the glass fiber component is selected from a glass felt or a glass cloth.

5. The zinc-iodine battery structure according to claim 1 , wherein a glass felt with a thickness of about 1 mm is used as the glass fiber component to protect the cation exchange membrane.

6. The zinc-iodine battery structure according to claim 1 , wherein the ZnI 2 solution has a molarity of 1 mol/l to 5 mol/l.

7. The zinc-iodine battery structure according to claim 1 , wherein the ZnI 2 solution is added with alcohol with a volume of 1/10 of a total volume.

Assignees

• Univ East China Normal

Inventors

• Wang Lianwei
• Shi Fangyao
• Shen Nanxi
• Xu Chunfang
• Xu Shaohui
• Zhu Yiping
• Xiong Dayuan
• Chen Shaoqiang
• Chu Junhao

Classifications

• H01M50/497

  Ionic conductivity · CPC title

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/454

  comprising a non-fibrous layer and a fibrous layer superimposed on one another · CPC title

• H01M8/188 Primary

  by recharging of redox couples containing fluids; Redox flow type batteries · CPC title

• H01M10/365 Primary

  Zinc-halogen accumulators · CPC title