▎ 摘　　要

NOVELTY - The battery has a separator interposed between a positive electrode (130) and a negative electrode that is stacked and built in a battery case with an electrolyte, where the negative electrode is stacked and built in a battery case together with the electrolyte. The negative electrode is provided with two negative electrode current collectors, and a first negative electrode mixture layer is formed on the first positive electrode current collector. A first conductive material is selected from a group consisting of multi-layered carbon nanotubes, double-walled carbon nano tubes, single-wall carbon nano tube, graphene, carbon black, acetylene black and ketjen black. The first negative active material is made of silicon-based active material, metal silicon, carbonaceous material, carbon-silicon nanocomposite, carbon oxide and carbon coated silicon or silicon oxide. USE - Used as secondary battery including two types of negative electrodes having different compositions. ADVANTAGE - The performance of the secondary battery is improved by preventing electrode degradation due to volume expansion of silicon-based compound. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of electrode assembly. 100Electrode assembly 110First negative electrode 120Second negative electrode 130Negative electrode