As a separator coating material, compared with alumina, boehmite separator coating can make the coated separator have higher thermal stability, lower thermal shrinkage and better electrolyte wettability, thereby improving the insulation of the separator and reducing the short-circuit rate of lithium battery. Compared with alumina, boehmite has low hardness and low density, which can effectively reduce the loss of coating materials to equipment and the weight of batteries.

Coating boehmite on the edge of the pole piece of the lithium battery can avoid the burr piercing the separator during the slitting process of the pole piece of the cathode material, and improve the safety and yield of the battery. In addition, because boehmite has the characteristics of low magnetism, low water absorption, low specific gravity and low Mohs hardness, it can help to improve the rate performance and cycle performance of the battery, and improve the yield rate of the product.