Cathodes and electrolytes for rechargeable magnesium batteries and methods of manufacture

Patent metadata

Field	Value
Publication number	US-12283654-B2
Application number	US-202318100722-A
Country	US
Kind code	B2
Filing date	Jan 24, 2023
Priority date	Jul 8, 2013
Publication date	Apr 22, 2025
Grant date	Apr 22, 2025

Abstract

The invention relates to Chevrel-phase materials and methods of preparing these materials utilizing a precursor approach. The Chevrel-phase materials are useful in assembling electrodes, e.g., cathodes, for use in electrochemical cells, such as rechargeable batteries. The Chevrel-phase materials have a general formula of Mo 6 Z 8 (Z=sulfur) or Mo 6 Z 1 8-y Z 2 y (Z 1 =sulfur; Z 2 =selenium), and partially cuprated Cu 1 Mo 6 S 8 as well as partially de-cuprated Cu 1-x Mg x Mo 6 S 8 and the precursors have a general formula of M x Mo 6 Z 8 or M x Mo 6 Z 1 8-y Z 2 y , M=Cu. The cathode containing the Chevrel-phase material in accordance with the invention can be combined with a magnesium-containing anode and an electrolyte.

First claim

What is claimed is:

1. An electrochemical cell, comprising:
an alkali-metal-containing anode;
a cathode, comprising:
a Chevrel-phase material of a formula Mo 6 Z 1 8-y Z 2 y derived from a precursor material of a formula M x Mo 6 Z 1 8-y Z 2 y , wherein M is a metallic element, ‘x’ is a number greater than 0 and less than 4, ‘y’ is a number from greater than 0 to less than 8 and each of Z 1 and Z 2 is a different chalcogen with or without the presence of oxygen; and an electrolyte comprising a solution of phenyl magnesium chloride-aluminum chloride and amidomagnesium-based magnesium salt transmetallated with an aluminum salt electrolyte.

2. The electrochemical cell of claim 1 , wherein the alkali-metal-containing anode comprises magnesium.

3. The electrochemical cell of claim 1 , wherein the metallic element is selected from the group consisting of Li, Na, Mg, Ca, Sc, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Y, Pd, Ag, Cd, In, Sn, Ba, La, Pb, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and mixtures thereof.

4. The electrochemical cell of claim 1 , wherein each of the chalcogen Z 1 and Z 2 is selected from chemical elements in Periodic Table Group 16.

5. The electrochemical cell of claim 1 , wherein each of the chalcogen Z 1 and Z 2 is selected from the group consisting of sulfur, selenium, tellurium, and mixtures of thereof.

6. The electrochemical cell of claim 1 , wherein M is copper, x is 2, Z 1 is sulfur and Z 2 is selenium.

7. The electrochemical cell of claim 1 , wherein the precursor material is formed from a mixture of MZ 1 , MZ 2 , MoZ 2 1 , MoZ 2 2 and molybdenum.

8. The electrochemical cell of claim 1 , wherein the Chevrel-phase material is of a formula Mo 6 S 8-y Se y which is derived from a precursor material of a formula Cu 2 Mo 6 S 8-y Se y , and the said precursor material is derived from a mixture of ammonium tetrathiomolybdate and anhydrous copper chloride in the presence of anhydrous N,N-dimethylformamide.

9. The electrochemical cell of claim 1 , wherein the said electrochemical cell is a rechargeable battery.

Assignees

• Univ Of Pittsburgh—Of The Commonwealth System Of Higher Education

Inventors

• Kumta Prashant N
• Saha Partha
• Datta Moni Kanchan
• Manivannan Ayyakkannu

Classifications

• C01P2002/77

  by unit-cell parameters, atom positions or structure diagrams · CPC title

• C01B19/007 Primary

  Tellurides or selenides of metals (C01B19/002 takes precedence) · CPC title

• C01B19/002

  Compounds containing, besides selenium or tellurium, more than one other element, with -O- and -OH not being considered as anions · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2006/12

  Surface area · CPC title