Salts of alkali metals of N, N'-disubstituted amides of alkane iminosulfinic acid and nonaqueous electrolytes on their basis

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#The invention relates to nonaqueous electrolytes for electrochemical cells, and more particularly to organic alkali metal salts for such cells.

#A fuller understanding of the present invention and the features and benefits thereof will be accomplished upon review of the following detailed description together with the accompanying drawings, in which:

#FIG. 1 is data showing the cycling stability of a liquid electrolyte based electrochemical cell, the electrolyte including a 0.5M solution of C5H11S(═NSO2C6H5)NLiSO2C6H5 in a propylene carbonate solvent.

#FIG. 2 is data showing the change in discharge capacity during cycling of a Li—MnO2 system having a polymer electrolyte including C—PVC:PC:LiClO4: C5H11S(═NSO2C6H5)NLiSO2C6H5 (18.1:72.5:3.1:6.3 wt %).

#The invention is related to organic salts of alkali metals and nonaqueous electrolytes formed from these salts for use in high energy primary and secondary batteries. The organic salt has an alkali metal bound to a disubstituted amide of alkane iminosulfinic acid.

#The salts described herein are suitable for use in liquid electrolytes or polymer electrolytes, such as gel or plasticized polymer electrolytes. Although this detailed description will generally describe a gel and plasticized polymer electrolyte formed using salts from the invention, it should be understood that the organic salts desribed herein in combination with nonaqueous solvents are also useful for lithium batteries having liquid electrolytes.

#In the case of a gel and plasticized polymer electrolyte, the nonaqueous gel or plasticized polymer electrolyte includes a polymer electrolyte material and a liquid electrolyte. The liquid electrolyte includes an organic salt as described above and a non-aqueous organic solvent, such as an aprotic solvent. The liquid electrolyte is integrated with the polymer matrix to form a modified polymer material which is generally referred to as a gel or plasticized polymer electrolyte. In a preferred embodiment of the invention, the salt is an alkali metal bonded to an N, N′-disubstituted amide of pentane iminosulfinic acid. Such salts have been previously unknown. The resulting nonaqueous electrolytes using the salts described herein provide high ionic conductivity as well as high levels of electrochemical and chemical stability for electrochemical cells formed using the invention. As a result, the invention can be used to produce batteries having improved properties.