Cell electrolyte solvent, cell electrolyte comprising the solvent and non-aqueous electrolyte battery comprising the electrolyte

DETAILED DESCRIPTION According to the first aspect of the present invention, there is provided a solvent for cell electrolyte comprising a carbamate compound of the formula [1]; ##STR2## wherein R.
sup.
1, R.
sup.
2 and R.
sup.
3 independently represent a linear or branched alkyl group, preferably, a lower alkyl group having 1 to 4 carbon atoms.
The solvent may include a cyclic carbonate of the following formula [2]; ##STR3## wherein R.
sup.
4 and R.
sup.
5 independently represent a substituent selected from the group consisting of a hydrogen atom, methyl group or ethyl group.
According to the second aspect of the invention, there is provided a cell electrolyte comprising, as an electrolyte solvent, a carbamate represented by the formula [1].
The solvent may include a cyclic carbonate of the formula [2].
The electrolyte comprises a solute electrolyte selected from the group consisting of LiPF.
sub.
6, LiBF.
sub.
4 and LiClO.
sub.
4.
According to the third aspect of the invention, there is provided a non-aqueous electrolyte battery comprising a negative electrode capable of being reversibly doped with lithium, a positive electrode and a non-aqueous electrolyte formed by dissolving a solute electrolyte in a non-aqueous solvent, wherein the non-aqueous solvent comprises one or more carbamates represented by the formula [1] in an amount of from 0.
05 to 20% by volume of the total volume of the non-aqueous solvent.
The non-aqueous solvent may include at least one carbonate solvent compound.
The positive electrode of the cell comprises LixMO.
sub.
2 wherein M represents at least one transition metal and 0.
05.
ltoreq.
.
times.
.
ltoreq.
1.
10.