| abstract |
The application provides a diaphragm coating material, a diaphragm, a preparation method of the diaphragm and a battery core, and belongs to the technical field of batteries. The diaphragm coating material comprises 20-50 parts by weight of inorganic material particles, 1-10 parts by weight of binder and 80-120 parts by weight of solvent. The inorganic material particles comprise bimetallic composite oxide particles, and the bimetallic composite oxide is obtained by sintering layered double-hydroxyl composite metal oxide. The diaphragm coating layer is made of the bimetal composite oxide and can absorb and adsorb hydrofluoric acid, water and carbon dioxide in an electric core system, so that gas expansion of the electric core is effectively reduced, dissolution of positive metal is reduced, and the cycle life of the electric core is prolonged. The bimetal composite oxide absorbing the moisture and the carbon dioxide can be changed into the layered double-hydroxide-radical composite metal oxide again, and the layered double-hydroxide-radical composite metal oxide can release the water and the carbon dioxide at a high temperature state, so that the flame retardant effects of reducing the concentration of combustion gas and blocking oxygen are achieved, and the safety of the battery core is improved. |