An interesting example is the material PVDF. Because PVDF is a polymer that has the same battery terminals. , Highly flexible , Good stability and a high electrical conductivity. Instead, it will have conductive when it was mixed with a solvent that can dissolve it. Solvents used to dissolve PVDF is DMF. In the process of research to know the ratio of PVDF and DMF before. Therefore, it is necessary to search for ingredients and tested. Then compared the results