▎ 摘　　要

NOVELTY - Material comprises graphene oxide nano sheet and hydrophilic metal oxide nano particles attached to the surface of the graphene oxide nano sheet. The hydrophilic metal oxide nano-particle comprises tungsten trioxide nanoparticles, titanium dioxide nanoparticles and silica nanoparticles. The reinforcing layer is a polyfluortetraethylene layer. The positive ion monomer comprises dimethyl diallyl ammonium chloride, and/or the oxygen-containing acid radical of target metal comprising tungstate. USE - The material is useful for battery diaphragm in vanadium battery (claimed). ADVANTAGE - The material: provides the surface of the two-dimensional nano-material graphene oxide nano sheet i.e. attached with hydrophilic metal oxide nano particles, thus the material has high dispersibility, good hydrophilicity, uses the hydrophobic metal oxide nanoparticles as active site of proton transmission, thus realize proton fast conduction while blocking the vanadium ion conduction, reduce the permeability of vanadium ions, and improve the service life of the battery. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) battery separator; and (2) preparing the material.