Additive for non-aqueous liquid electrolyte, non-aqueous liquid electrolyte secondary cell and non-aqueous liquid electrolyte electric double layer capacitor

#The present invention relates to an additive that is added to a non-aqueous electrolytic solution of a non-aqueous electrolytic solution secondary cell, a non-aqueous electrolytic solution electric double layer capacitor, or the like. More particularly, the present invention relates to a non-aqueous electrolytic solution secondary cell and a non-aqueous electrolytic solution electric double layer capacitor which have excellent self-extinguishability or flame retardancy, and resistance to deterioration, and which have low internal resistance and excellent conductivity due to the low viscosity of the non-aqueous electrolytic solution.

#Conventionally, nickel-cadmium cells have mainly been used as secondary cells particularly for memory-backups or power sources for the memory-backups of Audio Visual (AV) devices such as video tape recorders (VTRs) and information devices such as personal computers. Recently, the non-aqueous electrolytic solution secondary cell has been drawing a lot of attention as a replacement for the nickel-cadmium cell due to certain advantages, such as possessing high voltage, high energy density, and excellent self-dischargeability. Due to efforts to develop the non-aqueous electrolytic solution secondary cell, several products have become commercially available. For example, more than half of all notebook type personal computers, cellular phones and the like are powered by non-aqueous electrolytic solution secondary cells.

#Carbon is often used as the cathode material in non-aqueous electrolytic solution secondary cells, and various organic solvents are used as electrolytic solutions in order to both mitigate the risk when lithium is produced on the surface of cathode, and to increase outputs of voltages. Further, particularly in non-aqueous electrolytic solution secondary cells for use in cameras, alkali metals (especially metal lithium or lithium alloys) are used as the cathode material, and aprotic organic solvents such as ester-based organic solvents are ordinarily used as the electrolytic solutions.

#With reference to Examples and Comparative Examples, a more detailed description of the present invention will be given hereinafter. The present invention is not limited to Examples described below:

#<<Non-Aqueous Electrolytic Solution Secondary Cell>>

#[Preparation of a Non-Aqueous Electrolytic Solution]