Electrolyte for aluminum electrolytic capacitor and aluminum electrolytic capacitor using electrolyte

Patent metadata

Field	Value
Publication number	US-11120948-B2
Application number	US-201816055172-A
Country	US
Kind code	B2
Filing date	Aug 6, 2018
Priority date	Sep 19, 2016
Publication date	Sep 14, 2021
Grant date	Sep 14, 2021

Abstract

An electrolyte for an aluminum electrolysis capacitor and the aluminum electrolysis capacitor using the electrolyte are provided. The electrolyte comprises a primary solute, a primary solvent, and an additive as shown in a structural formula 1, wherein, R1 and R2 are each independently selected from —CH3, —CH2CH3 or —OH; R3 and R4 are each in selected from —(CH2CH2O)mH or —H, and n and m are integrals ranging from 1 to 10000, respectively. The electrolyte has excellent anti-corrosive performance and is capable of maintaining long load service life under the condition of relatively high chlorine ion content, and there is no evidence of corrosion in the capacitor after it is disassembled.

First claim

We claim:

1. An electrolyte for an aluminum electrolysis capacitor, comprising a primary solute, a primary solvent, and an additive as shown in structural formula 1,

wherein, R 1 and R 2 are each independently selected from —CH 3 , —CH 2 CH 3 or —OH; R 3 and R 4 are each independently selected from —(CH 2 CH 2 O)mH or —H, and n and m are integrals ranging from 1 to 10000, respectively.

2. The electrolyte according to claim 1 , wherein, content of the additive in the electrolyte is 5%-10% of the total mass of the electrolyte.

3. The electrolyte according to claim 1 , wherein, the primary solute is an ammonium salt of branched dicarboxylic 1,4-DDA; the primary solvent is ethylene glycol.

4. The electrolyte according to claim 1 , wherein, the electrolyte further comprises a cooperation solute.

5. The electrolyte according to claim 1 , wherein, the electrolyte further comprises a solvent stabilizer.

6. The electrolyte according to claim 1 , wherein, the electrolyte further comprises a formation improver.

7. The electrolyte according to claim 1 , wherein, the electrolyte further comprises a hydrogen absorption agent.

8. An aluminum electrolysis capacitor, comprising the electrolyte according to claim 1 .

9. The aluminum electrolysis capacitor according to claim 8 , wherein, a voltage of the aluminum electrolysis capacitor is in a range of 450-500V.

10. The electrolyte according to claim 4 , wherein, the cooperation solute is linear dicarboxylic ammonium sebacate.

11. The electrolyte according to claim 5 , wherein, the solvent stabilizer is an ethylene glycol polymer.

12. The electrolyte according to claim 5 , wherein, the solvent stabilizer is an diethylene glycol or polyethylene glycol.

13. The electrolyte according to claim 6 , wherein, the formation improver is ammonium hypophosphite.

14. The electrolyte according to claim 7 , wherein, the hydrogen absorption agent is a nitrobenzene compound.

15. The electrolyte according to claim 7 , wherein, the hydrogen absorption agent is a p-nitrobenzene methanol.

16. An electrolyte for an aluminum electrolysis capacitor, comprising a primary solute, a primary solvent, and an additive as shown in compound 1,

wherein, n is an integral ranging from 1 to 10000.

17. An aluminum electrolysis capacitor, comprising the electrolyte according to claim 16 .

Assignees

• Shenzhen Capchem Technology Co Ltd

Inventors

• Huang Liqing
• Jia Yun
• Huang Fengliang
• Wang Mingjie

Classifications

• H01G9/035 Primary

  Liquid electrolytes, e.g. impregnating materials (H01G11/54 takes precedence) · CPC title

• H01G9/145

  Liquid electrolytic capacitors (H01G11/00 takes precedence) · CPC title