ELECTRODE WITH ORGANIC/INORGANIC COMPOSITE AND ELECTROCHEMICAL DEVICE COMPRISING THE SAME Technical Field The present invention relates to an identifiable electrode that allows users to easily identify the origin or kind of the electrode itself or an electrochemical device using the same electrode. Also, the present invention relates to an electrochemical device using the above electrode. Background Art Electrochemical devices are power sources for electronic appliances, etc. As the use of batteries is enlarged to applications for the storage of energy for portable telephones, camcorders, notebook computers, personal computers and electric vehicles, efforts on the research and development of batteries are increasingly embodied. Meanwhile, since the electrochemical devices have been in increasing demand, counterfeits thereof have been distributed more and more. Such counterfeits have lower safety than authentic products. However, when an electrochemical device causes explosion due to the counterfeit, it is difficult to check the authenticity of the device. Therefore, there has been an imminent need for a method for checking the authenticity of an electrochemical device. According to the prior art, there has been suggested a method for checking the authenticity of an electrochemical device by incorporating a semiconductor capable of communicating with the main body of an electronic appliance into the electrochemical device. However, the above method requires an additional space for housing the semiconductor inside the device, so that the space for receiving electrodes inside the device grows smaller. This ultimately results in a drop in the capacity of a battery. Additionally, such introduction of a semiconductor into the electrochemical device causes degradation of the productivity and cost- efficiency. Disclosure Technical Problem Therefore, the present invention has been made in view of the above-mentioned problems. It is an object of the present invention to provide an electrode comprising an organic/inorganic composite into which inorganic particle(s) having a unique spectrum or color pattern is (are) introduced according to a predetermined rule, so that the electrode or an electrochemical device using the same allows users to identify its origin or kind. Technical solution In order to achieve the above-mentioned object, there is provided an electrode comprising an organic/inorganic composite introduced onto either surface or both surfaces thereof, the organic/inorganic composite comprising inorganic particle or aggregates thereof having a unique spectrum or color pattern according to a predetermined rule, and a polymer capable of interconnecting and fixing the inorganic particles. Also, there is provided an electrochemical device comprising the above electrode. Further, there is provided a method for identifying the origin or kind of the electrode itself or the electrochemical device comprising the same by using the electrode. Hereinafter, the present invention will be explained in more detail. In general, an electrochemical device comprises a cathode, an anode, a separator and an electrolyte. The above constitutional elements have been developed to have various structural characteristics in order to improve the quality of the device. For example, an organic/inorganic composite may be introduced onto the surface of an electrode. The organic/inorganic composite serves as a separator, is bound firmly to the interface with an electrode, and has little possibility of heat shrinking. Thus, it is possible to improve the quality and safety of the device. The organic/inorganic composite may comprise inorganic particle(s); and a polymer capable of interconnecting and fixing the inorganic particles. As the inorganic particles, white inorganic particles, such as alumina, silica or titania, have been used widely. Moreover, there is no disclosure of such organic/inorganic composites used to identify the origin or kind of the electrode or electrochemical device. According to the present invention, inorganic particle(s) having a unique spectrum or color pattern is(are) introduced into the organic/inorganic composite as the inorganic component according to a predetermined rule, so as to make the electrode itself identifiable. Each kind of inorganic particle has its unique spectrum or color pattern. Therefore, when such inorganic particle(s) is(are) introduced into an organic/inorganic composite according to a predetermined rule, the electrode comprising the same organic/inorganic composite can be identifiable like a trademark. Herein, the above "predetermined rule" means a specific spectrum (peak position and intensity) and/or color pattern determined preliminarily so that the organic/inorganic composite or electrode according to the present invention can be distinguished from the others manufactured by a third party. Particularly, the specific spectrum (peak position and intensity) and/or color pattern may be variable depending on the number, kind, content, etc. of the inorganic particles used in the organic/inorganic composite. For example, it is possible to control the peak position and intensity by using one or more kinds of inorganic particles and by adjusting the amounts of the particles. Otherwise, it is possible to control the color pattern by using one or more kinds of inorganic particles capable of developing a color in the visible light or non-visible light range; or one or more kinds of inorganic particles capable of developing a color or undergoing a color change under a specific chemical condition (e.g. temperature, oxidation state, etc.). Further, it is possible to control both the spectrum and the color pattern by using at least two kinds of inorganic particles in combination or by varying the arrangement of the particles. Therefore, according to the present invention, it is possible to identify the origin or kind of the electrode itself or the electrochemical device comprising the same by checking the spectrum and/or color pattern of the organic/inorganic composite. Particularly, according to the present invention, the electrode itself functions as a means for identification. Thus, no additional space for an identification means is required, thereby preventing a drop in the capacity of the electrochemical device. Also, the identification method according to the present invention may be applied to counterfeits made only inside the electrochemical device. There is no particular limitation in the inorganic particle used in the present invention, as long as the particle has its unique spectrum or color pattern. For example, the inorganic particle includes: (i) inorganic particles having a unique spectrum or color pattern in the visible light range; (ii) inorganic particles having a unique spectrum or color pattern in the non-visible light range; or (iii) inorganic particles having a unique spectrum or color pattern under a specific chemical condition (e.g. temperature or oxidation state). Additionally, inorganic particles used in paints or pigments, or phosphor particles used in display devices or lamps may be used in the present invention. Non-limiting examples of the inorganic particle having a unique spectrum or color pattern, such as a white, black, yellow, orange, brown, red, violet, blue, green, gray, pink or fluorescent color, in the visible light range (a wavelength range of 380~770nm) are as follows: (a) white: Al203, ZnO, ZnS, Si02, Zr02, Sn02, CeO2, MgO, CaO, Y203, TiO2, Sb2O3, BaTiO3, SrTiO3, Pb(Zr,Ti)O3 (PZT), Pb1- xLaxZr1-yTiyO3 (PLZT), etc. (b) black: Fe3O4, (Co, Ni)0-(Cr, Fe)2O3, etc. (c) yellow: PbCrO4, ZnCrO4, BaCrO4, CdS, FeO(OH) nH2O, TiO2-NiO-Sb2O3, Pb(CN)2, Ca2PbO4, Al, Fe, Sn-2PbO-Sb2O5, V-SnO2, V- ZrO2, Pr-ZrSiO4, CrSbO4 or Cr2WO6-TiO2, ZrSO4 coated CdS or (CdZn)S, etc. (d) orange: PbCrO4 PbO, PbCrO4 PbMoO4 PbSO4, etc. (e) brown: Fe2O3+FeO, Fe2O3+MnO2+Mn3O4, ZnO • (Al, Cr, Fe)2O3, etc. (f) red: Fe2O3, Pb3O4, HgS, CdS+CdSe, CdS+HgS, 2Sb2S3 Sb2O3, etc. (g) violet: Co3(PO4)2, CO3(PO4)2 4H2O, CO3(PO4)2 8H2O, etc. (h) blue: 3NaAl Si04 Na2S2, Fe4 [Fe (CN6) 3] nH2O, CoO nAl2O3, CoO nSnO2 mMgO, Co3O4+SiO2+Al2O3+Fe2O3+NiO+MnO, CoO-nAl203 or (Co, Zn)O-nAl2O3, 2 (Co, Zn)O -SiO2, V-ZrSiO4, etc. (i) green: Cr2O3, Cr2O(OH)4, Cu(CH3CO2)2 3CuO(AsO2)2, CoO- ZnO-MgO, (Co, Zn)0 • (Al, Cr)2O3, 3CaO-Cr2O3 -3SiO2, (Al, Cr)2O3, etc. (j) gray: Sb-SnO2, Co,Ni-ZrSiO4, etc. (k) pink: Mn, P-a-Al2O3, ZnO • (Al, Cr)2O3, Cr-CaO -SnO2 •SiO2, Fe-ZrSiO4, Cr,Co-CaO • Sn02 -SiO2, ZrSiO4 coated Cd (S, Se), etc. (1) fluorescent color: ZnS, Zn2SiO4, (Zn,Cd)S, CaS, SrS, CaWO4, etc. (m) others: SiC (green and/or black), Si3N4 (white), etc. Although there is no particular limitation in the size of the inorganic particle, the inorganic particle preferably has a size of 0.001 /zm~10 //m. If the size is less than 0.01 im, the pores formed by the inorganic particles are too small. Thus, it may be difficult to transfer lithium ions through the organic/inorganic composite. If the size is greater than 10 im, the resultant electrode has an increased thickness. Meanwhile, a polymer capable of interconnecting and fixing the inorganic particles may be used a binder polymer currently used in the art. The polymer serves as a binder that interconnects and stably fixes the inorganic particles among themselves, and between the inorganic particles and the surface of an electrode active material, and thus prevents degradation in mechanical properties of a final resultant organic/inorganic composite. The polymer preferably has a glass transition temperature (Tg) of between -200°C and 200"C in order to improve mechanical properties such as flexibility and elasticity of a final resultant organic/inorganic composite. Additionally, the polymer preferably shows a high degree of swelling with an electrolyte by being gelled when impregnated with an electrolyte, and more preferably has a solubility parameter between 15 and 4 5 MPa1/2. Non-limiting examples of the polymer that may be used in the present invention include polyvinylidene fluoride-co- hexafluoropropylene, polyvinylidene fluoride-co- trichloroethylene, polymethylmethacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate, polyethylene-co-vinyl acetate, polyimide, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethylpolyvinylalcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, carboxylmethyl cellulose, polyvinylalcohol or mixtures thereof. There is no particular limitation in the ratio of the inorganic particles to the polymer forming the organic/inorganic composite according to the present invention. The ratio may be controlled in a range of 10:90~99:1 (on the weight basis), and preferably of 50:50~99:1 (on the weight basis), depending on the thickness and physical properties of the finally formed electrode and the content of the inorganic particles defined by the predetermined rule. The organic/inorganic composite according to the present invention may further comprise other additives. Meanwhile, the organic/inorganic composite according to the present invention has pores. The pores can be capable of lithium ion conduction when they are subsequently impregnated with an electrolyte. The pores may be formed among the inorganic particles, between inorganic particles and polymers, or by an entangled structure of the polymers. Additionally, the pore has a size depending on the size of the inorganic particles. The electrode according to the present invention comprises the organic/inorganic composite bound to either surface or both surfaces thereof. For example, the electrode according to the present invention may comprise the organic/inorganic composite entangled with the pores of the electrode by the polymers. In this case, the organic/inorganic composite is preferably introduced to a predetermined thickness (more preferably to a thickness of 1~10 μm), along the thickness direction of the electrode so that the organic/inorganic composite is sufficiently impregnated with the electrolyte and can function also as an electrolyte. For reference, FIG. 1 shows the electrode having the organic/inorganic composite introduced onto either surface or both surfaces thereof according to the present invention. One embodiment of the method for manufacturing the electrode according to the present invention comprises the steps of: (a) dissolving a polymer capable of functioning as a binder into a solvent to provide a first, mixed solution; (b) adding at least one kind of the aforementioned inorganic particles to the first mixed solution of step (a) and mixing them to provide a second mixed solution; and (c) coating the second mixed solution onto the surface of an electrode, followed by drying. Although there is no particular limitation in the solvent used in step (a), the solvent preferably has a solubility parameter similar to the solubility of the polymer and a low boiling point in order to facilitate uniform mixing and removal of the solvent. Non-limiting examples of such solvents include acetone, tetrahydrofuran, methylene chloride, chloroform, dimethylformamide, N-methyl-2-pyrrolidone (NMP), cyclohexane, water and mixtures thereof. Meanwhile, in step (b), it is preferred to perform crushing of the inorganic particles after at least one kind of the aforementioned inorganic particles is added to the first mixed solution. The time for crush is suitably 1-20 hours. The particle size of the crushed particles ranges preferably from 0.01 and 10 μm. Conventional crush methods, preferably a method using a ball mill may be used. And, in step (c), the conventional coating methods known to one skilled in the art may be used. It is possible to use various processes including dip coating, die coating, roll coating, comma coating or combinations thereof. Meanwhile, there is no particular limitation in the electrode into which the organic/inorganic composite is introduced, as long as the electrode is one currently used in electrochemical devices. In general, the electrode comprises an electrode active material bound to a current collector. The electrode active material may include a cathode active material and an anode active material. Non-limiting examples of the cathode active material include: lithium transition metal composite oxides, including LiMxOy (wherein M= Co, Ni, Mn, CoaNibMnc) , such as lithium manganese composite oxides (e.g. LiMn2O4) , lithium nickel oxides (e.g. LiNiO2) , lithium cobalt oxides (e.g. LiCo02) , or other oxides containing other transition metals partially substituting for manganese, nickel and cobalt; chalcogenide (e.g. manganese dioxide, titanium disulfide, molybdenum disulfide, etc.); or the like. Among these examples, LiCo02, LiNiO2, LiMnO2, LiMn2O4, Li (NiaCobMnc) O2 (wherein 0