Patent ID: 7504181
Filing Date: 2009-03-17
Classification: H01M,Y02E,Y10T

Abstract:
1. A non-polymerized nonaqueous liquid electrolyte having a viscosity at 20° C. of 60 cP to 30,000 cP comprising: a nonaqueous solvent containing 50-95% by volume y-butyrolactone,, an electrolyte dissolved in the nonaqueous solvent, and a macromolecular material added to the nonaqueous solvent comprising the structure represented by the formula: wherein n≧1, wherein the content of the macromolecular material added to the nonaqueous solvent is 0.01% or more, but less than 10% by weight; wherein the ratio p ranges from 0.001 to 0.05, wherein p=σ/η, and σ is the ion conductivity (10