TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The ionic group is cationic group consisting of sulfonium, imidazolium, ammonium, pyridinium, pyrazolium, piperidinium, triazolium, thiazolium, oxazolium, pyridazinium, pyrimidinium, pyrazinium, phosphonium, and pyrrolidinium and anionic group consisting of tetrafluoroborate (BF4), hexafluorophosphate (PF6), perchlorate (ClO4), trifluoromethane sulfonate (CF3SO3), bis(trifluoromethanesulfone)imide (N(CF3SO2)2), bis(pentafluoroethanesulfone)imide (N(C2F5SO2)2), perfluorinated sulfone (C(CF2SO2)3), arsenic pentoxide (AsF6), antimony pentafluoride (SbF6), tetrachloroaluminate (AlCl4), niobium fluoride (NbF6), and trifluoroacetate (CF3CO2). The organic electrolytic solution is: a solvent consisting of ethylene carbonate, polypropylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, dimethoxyethane, diethoxyethane, tetrahydrofuran, and gamma -butyrolactone; or lithium salts consisting of lithium hexafluorophosphate, lithium perchlorate, lithiumtetrafluoroborate, lithium trifluoromethanesulfonate, lithium hexafluoro acetate and lithiumtrifluoromethanesulfonylimide. The cross-linking agent comprises reactive functional groups consisting of vinyl group, acrylate group or methacrylate group. The composition comprises 5-20 pts. wt. of ionic liquid monomer and 2-5 pts. wt. of cross-linking agent. The ionic liquid monomer is a compound of formula (I). The cross-linking agent is 1,3-butandiol diacrylate or trimethylolpropane triacrylate. The lithium secondary battery is formed by in-situ polymerization of the ionic liquid polymer composition, where the ionic liquid polymer electrolyte is injected between the anode and cathode.R = 1-8C-alkyl;X+ = sulfonium, imidazolium, ammonium, pyridinium, pyrazolium, piperidinium, triazolium, thiazolium, oxazolium, pyridazinium, pyrimidinium, pyrazinium, phosphonium, or pyrrolidinium; andY1- = BF4, PF6, ClO4, CF3SO3, N(CF3SO2)2, N(C2F5SO2)2, C(CF2SO2)3, AsF6, SbF6, AlCl4, NbF6, or CF3CO2. EXAMPLE - No suitable example given.