TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The electrode comprises electrode manufactured by coating cyclic carbonate compound substituted with halogen element(s) and vinyl group containing compound on surface of electrode active material or preliminarily formed electrode; electrode manufactured by using cyclic carbonate compound substituted with halogen element(s) and vinyl group containing compound as electrode materials; or electrode comprising SEI layer formed on surface, where SEI layer is formed by dipping electrode into solution comprising cyclic carbonate compound substituted with halogen element(s) and vinyl group containing compound, followed by charge and discharge, and comprising compounds or product resulting from reduction.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The cyclic carbonate compound substituted with halogen element comprises 3-fluoroethylene carbonate, 3-chloroethylene carbonate, 4-fluoromethylethylene carbonate, trifluoromethylethylene carbonate, cis-3,4-difluoroethylene carbonate or trans-3,4-difluoroethylene carbonate. The vinyl group is positioned at terminal portion within molecule. The vinyl group-containing compound is acrylate-based compound, sulfonate-based compound or ethylene carbonate based compound. The acrylate-based vinyl-containing compound group comprises tetraethyleneglycol diacrylate, polyethylene glycol diacrylate, bisphenol-A-ethoxylated diacrylate, 1,4-butanediol-diacrylate, 1,6-hexanediol diacrylate, trimethylolpropane triacrylate, ditrimethylolpropane tetraacrylate, dipentaerythritol hexaacrylate, or tris(2-(acryloyloxy)ethyl) isocyanurate. The sulfonate-based compound containing vinyl group is of formula R4-S(=O)(=O)-O-R5, and comprises propenyl methansulfonate, ethenyl benzenesulfonate, propenyl propensulfonate, propenyl cyanoethansulfonate or ally prop-2-ene-1-sulfonate. The ethylene carbonate based compound containing vinyl group is of formula (3), and comprises 3-vinyl-ethylene carbonate, 3-allyl-ethylene carbonate or (2-oxo-1,3-dioxolan-4-yl)methyl-prop-1-ene-1-sulfonate.R4, R5=vinyl group, H, halo, 1-6C alkyl group, 6-12C aryl group, 2-6C alkenyl group or their halo derivative;andR10-R13=vinyl group, H, halo, 1-6C alkyl group, 6-12C aryl group, 2-6C alkenyl group, sulfonate group or their halo derivative.Preferred Composition: The content ratio of cyclic carbonate compound substituted with halogen element to vinyl group containing compound is 1:0.1-10. Each cyclic carbonate compound substituted with halogen element and the vinyl group containing compound is present at 0.05-10 pts.wt.; and the total content of two compounds is present at 0.1-20 pts.wt. based on 100 pts.wt. electrolyte.