NOVELTY - A nanoparticle organic hybrid material comprises inorganic nanoparticles covalently grafted with at least one anion of an organic sodium or lithium salt.    USE - As nanoparticle organic hybrid material in the preparation of electrolytes suitable for lithium and sodium secondary batteries (claimed) used as electrochemical cells.    ADVANTAGE - The electrolyte comprising the material is non-flammable, non-volatile, does not leak and non-toxic and hence is safer both in use and after disposal. The solid electrolytes exhibit improved mechanical properties and ionic conductivity selective to Li+ or Na+ cations; and avoid concentration polarization. The material provides solvent-free nanoscale organic hybrid material in which the anion of a lithium or sodium salt is covalently grafted in the surface of inorganic nanoparticles. The anchorage of the anion by covalent bonds to the nanoparticles by means of a hydrocarbon arm avoids concentration gradients, with only lithium or sodium cations mobile, without decrease in ionic conductivities. The material confers good mechanical properties due to the hard nanoparticles preventing creep under pressure, without the need for crosslinking and good electrochemical stability window. The material grafted with salt and the organic polymeric segments exhibit liquid-like properties so that the material moves freely and flows in the absence of suspending solvent.    DETAILED DESCRIPTION - A nanoparticle organic hybrid material comprises inorganic nanoparticles covalently grafted with at least one anion of an organic sodium or lithium salt of formula (I), where the inorganic nanoparticles are grafted with the anion of the sodium or lithium salt (I) through the L group.    T1=inorganic nanoparticle;    L=1-6C alkylene or phenylene-1-4C alkylene;    X=sodium or lithium.    INDEPENDENT CLAIMS are included for the following:    (1) a process for the preparation of hybrid material involving reacting a compound of formula RG-L-SO2-N--SO2-CF3 X+ (III) with an inorganic nanoparticle;    (2) an electrolyte suitable for its use in a sodium or lithium battery, where the electrolyte comprises the hybrid material; and    (3) a sodium or lithium battery which comprises the electrolyte.    RG=a reacting group;    X(+)=a cation of a base.