Electrolyte solution, secondary battery and method for producing electrolyte solution

Abstract

The present invention provides an electrolyte which is capable of retaining a high magnesium ion concentration. An electrolyte in accordance with an aspect of the present invention is obtained by mixing a solvent, metal magnesium, and an elemental halogen.

1 . An electrolyte, comprising a solvent, a magnesium ion, and a halide ion,
 the solvent being a sulfone solvent.   
     
     
         2 . (canceled) 
     
     
         3 . The electrolyte as set forth in  claim 1 , comprising the magnesium ion in an amount of not less than 0.5 mol/L relative to a total amount of the electrolyte. 
     
     
         4 . The electrolyte as set forth in  claim 1 , wherein the number of magnesium atoms having a coordination number of 4 is not less than 95% of the number of all magnesium atoms when the electrolyte is analyzed by soft X-ray fluorescence XAFS method. 
     
     
         5 . The electrolyte as set forth in  claim 1 , wherein the solvent is an organic solvent or an ionic liquid. 
     
     
         6 . (canceled) 
     
     
         7 . The electrolyte as set forth in  claim 1 , comprising a bromide ion or an iodide ion as the halide ion. 
     
     
         8 . A secondary battery, comprising an electrolyte recited in  claim 1 . 
     
     
         9 . A method for producing an electrolyte, comprising the step of: mixing a solvent, metal magnesium, and an elemental halogen,
 the solvent being a sulfone solvent.   
     
     
         10 . The method as set forth in  claim 9 , wherein the electrolyte contains a magnesium ion in an amount of not less than 0.5 mol/L relative to a total amount of the electrolyte. 
     
     
         11 . The method as set forth in  claim 9 , wherein the number of magnesium atoms having a coordination number of 4 is not less than 95% of the number of all magnesium atoms when the electrolyte is analyzed by soft X-ray XAFS method. 
     
     
         12 . The method as set forth in  claim 9 , wherein the solvent is an organic solvent or an ionic liquid. 
     
     
         13 . (canceled) 
     
     
         14 . The method as set forth in  claim 9 , wherein the elemental halogen is a bromine molecule or an iodine molecule.