LITHIUM SECONDARY BATTERY

摘要

The present invention provides a lithium secondary battery comprising: a positive pole; a negative pole; a separator; and a gel polymer electrolyte wherein i) the negative pole comprises a Si based negative pole active material ii) the gel polymer electrolyte is made by polymerizing a composition comprising a monomer having a functional group capable of binding to a metal ion wherein iii) charge voltage of the battery is within the range of 3.0V to 5.0V. The lithium secondary battery according to the present invention prevents metal ions eluted from the positive pole from moving to the negative pole or reduces metal precipitation in the negative pole and thereby enhances the life of the battery and retains superior capacity properties of the battery when charged with normal voltage as well as high voltage.