Electrolytic solution and electrochemical device

Patent metadata

Field	Value
Publication number	US-12034120-B2
Application number	US-202117164139-A
Country	US
Kind code	B2
Filing date	Feb 1, 2021
Priority date	Aug 1, 2018
Publication date	Jul 9, 2024
Grant date	Jul 9, 2024

Abstract

An electrolytic solution for an electrochemical device including a magnesium electrode as a negative electrode is provided. The electrolytic solution includes a linear ether solvent. The linear ether solvent includes a first magnesium salt having a disilazide structure represented by a general formula (R3Si)2N where R represents a hydrocarbon radical with one or more and ten or less carbon atoms and a second magnesium salt without the disilazide structure.

First claim

The invention claimed is:

1. An electrolytic solution for an electrochemical device including a magnesium electrode as a negative electrode, the electrolytic solution comprising:
a solvent including a linear ether,
wherein the solvent includes:
a first magnesium salt having a disilazide structure represented by a general formula (R 3 Si) 2 N, wherein R represents a hydrocarbon radical with one or more and ten or less carbon atoms, and
a second magnesium salt without the disilazide structure,
wherein the second magnesium salt includes a halogen metal salt and an imide metal salt.

2. The electrolytic solution according to claim 1 , wherein the R in the disilazide structure represents an aliphatic hydrocarbon group with one or more and ten or less carbon atoms.

3. The electrolytic solution according to claim 1 , wherein the R in the disilazide structure represents a lower alkyl group with one or more and four or less carbon atoms.

4. The electrolytic solution according to claim 1 , wherein the first magnesium salt includes magnesium bis(hexamethyldisilazide).

5. The electrolytic solution according to claim 1 , wherein the halogen metal salt includes magnesium chloride.

6. The electrolytic solution according to according to claim 1 , wherein the imide metal salt includes a magnesium salt of perfluoroalkyl sulfonyl imide.

7. The electrolytic solution according to according to claim 1 , wherein the second magnesium salt includes magnesium chloride and magnesium bis(trifluoromethanesulfonyl) imide.

8. The electrolytic solution according to claim 1 , wherein a molar ratio of the first magnesium salt to the second magnesium salt is 0.01 or more.

9. The electrolytic solution according to according to claim 2 , wherein a molar ratio of the first magnesium salt to the imide metal salt is 0.01 or more.

10. The electrolytic solution according to claim 1 ,
wherein the linear ether is an ether represented by the chemical formula 1 below:

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

11. The electrolytic solution according to claim 10 , wherein the R′ and the R″ independently represent a lower alkyl group with one or more and four or less carbon atoms.

12. The electrolytic solution according to claim 1 , wherein a positive electrode of the electrochemical device includes a sulfur electrode including sulfur.

13. The electrochemical device including the negative electrode and a positive electrode, wherein
the negative electrode includes the magnesium electrode, and
the electrolytic solution according to claim 1 .

14. The electrochemical device according to claim 13 , wherein the positive electrode includes a sulfur electrode including sulfur.

15. The electrochemical device according to claim 13 , wherein magnesium precipitated by charging and discharging has a geometrical grain shape.

16. The electrolytic solution according to claim 1 , wherein a molar ratio of the first magnesium salt to the second magnesium salt is 1 or less.

Assignees

• Murata Manufacturing Co

Inventors

• Matsumoto Ryuhei
• Nakayama Yuri
• Kawasaki Hideki

Classifications

• H01M2300/0028

  characterised by the solvent · CPC title

• H01M2300/002

  Inorganic electrolyte · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M4/466 Primary

  Magnesium based · CPC title