TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Device: An electronic device is formed using the secondary battery.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The non-aqueous electrolyte contains ionic liquids (3 mol/L). The non-aqueous electrolyte further contains an organic solvent to dilute the ionic liquid. Preferred Solvent: The organic solvent is linear carbonate, cyclic ester, chain ester and/or cyclic carbonate. Preferred Liquids: The ionic liquid is of formula (1).R1-R4=alkyl group or alkoxy group, preferably 3-7C alkyl group or alkoxy group;andX=bistrifluoromethyl sulfonyl imide or tolylthiobenzene fluoroethane sulfonyl imide. EXAMPLE - Cathode active material (in mass parts) (90), binder (10), trimethyl propyl ammonium and N-methyl-2-pyrrolidone were mixed to obtain paste-form of cathode compound material. The obtained paste-form of cathode compound material was coated to copper-foil collector having thickness of 20 microns, dried at 120degreesC for 5 minutes and electrode-compressed by roll press to obtain a cathode. Binder (5), acetylene black (5) and lithium carbonyl cobalt complex (LiCoCO2) as anode active material (90) were mixed to obtain paste-form of anode compound material. The obtained paste-form of anode compound material was coated to aluminum-foil collector having thickness of 14 microns, dried at 120degreesC for 5 minutes and electrode-compressed by roll press to obtain a anode. Ethylene carbonate, ethylmethyl carbonate and trimethyl propyl ammonium bistrifluoromethyl sulfonyl imide were mixed to obtain electrolyte liquid containing ionic liquid (0.5 mol/L). The obtained anode and cathode, and microporous film of polyolefin type (separator) were laminated, and electrolyte liquid was poured to obtain lithium ion battery of coin cell type. The obtained lithium ion battery had excellent regeneration acceptance property, current density of 0.65 mA/cm2, charging final voltage of 4.2 V and discharge final voltage of 2.7 V.