Electrolytic solution and electrochemical device

Patent metadata

Field	Value
Publication number	US-12095081-B2
Application number	US-202117245753-A
Country	US
Kind code	B2
Filing date	Apr 30, 2021
Priority date	Oct 30, 2018
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

Provided is an electrolytic solution for an electrochemical device having an electrode including magnesium as a negative electrode. The electrolytic solution includes a solvent having a linear ether and a magnesium salt included in the solvent, and a linear ether solvent further includes a cyclic organic compound having a two-dimensional structure or a three-dimensional structure.

First claim

The invention claimed is:

1. An electrolytic solution for an electrochemical device having an electrode including magnesium as a negative electrode, the electrolytic solution comprising:
a solvent including a linear ether; and
a magnesium salt included in the solvent,
wherein the solvent further includes a cyclic organic compound having a two-dimensional structure or a three-dimensional structure,
wherein a positive electrode of the electrochemical device is a sulfur electrode, and wherein the sulfur electrode is composed of elemental sulfur as an active ingredient as an active ingredient, a conductive aid, and a binder.

2. The electrolytic solution according to claim 1 , wherein the cyclic organic compound includes a fused ring compound.

3. The electrolytic solution according to claim 2 , wherein the number of rings in the fused ring compound is 3 to 6.

4. The electrolytic solution according to claim 2 , wherein the fused ring compound includes an anthracene skeleton.

5. The electrolytic solution according to claim 1 , wherein a content of the cyclic organic compound in the electrolytic solution is smaller than a content of the magnesium salt in the electrolytic solution.

6. The electrolytic solution according to claim 1 , wherein the content of the cyclic organic compound in the electrolytic solution is 0.1 M or less.

7. The electrolytic solution according to claim 1 , wherein the linear ether includes an ethyleneoxy structural unit represented by the chemical formula 1:

wherein R′ and R″ each independently represent a hydrocarbon group having 1 or more and 10 or less carbon atoms, and n is an integer from 1 to 10.

8. The electrolytic solution according to claim 7 , wherein the n is an integer from 1 to 4, and the linear ether has one or more and four or less ethyleneoxy structural units.

9. The electrolytic solution according to claim 7 , wherein the R′ and the R″ each independently represent a lower alkyl group having 1 or more and 4 or less carbon atoms.

10. The electrolytic solution according to claim 7 , wherein the n is 2, and the linear ether has two ethyleneoxy structural units.

11. The electrolytic solution according to claim 1 , further comprising a halogen metal salt as the magnesium salt.

12. The electrolytic solution according to claim 11 , wherein the halogen metal salt includes magnesium chloride.

13. The electrolytic solution according to claim 11 , further comprising an imide metal salt as the magnesium salt.

14. An electrochemical device comprising:
a negative electrode, an electrolytic solution, and a positive electrode,
wherein the negative electrode includes magnesium,
wherein the electrolytic solution includes a solvent including a linear ether, and a magnesium salt included in the solvent, wherein the solvent further includes a cyclic organic compound having a two-dimensional structure or a three-dimensional structure, and
wherein the positive electrode is a sulfur electrode, and wherein the sulfur electrode is composed of elemental sulfur as an active ingredient as an active ingredient, a conductive aid, and a binder.

15. The electrolytic solution according to claim 1 , wherein the sulfur electrode is composed of S 8 sulfur as the active ingredient, a carbon material as the conductive aid, and a fluorine-containing resin as the binder.

16. The electrochemical device according to claim 14 , wherein the sulfur electrode is composed of S 8 sulfur as the active ingredient, a carbon material as the conductive aid, and a fluorine-containing resin as the binder.

Assignees

• Murata Manufacturing Co

Inventors

• Matsumoto Ryuhei
• Nakayama Yuri

Classifications

• H01M4/466

  Magnesium based · CPC title

• H01M10/054

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

• H01M2300/0028

  characterised by the solvent · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/027

  Negative electrodes · CPC title