Hebei Messi Biology Co., Ltd. stated that in the working state of hot battery, in order to prevent the flow of molten electrolyte, it is necessary to add flow inhibitor to make isolation powder for use. The flow inhibitor should not react with metallic lithium. The commonly used flow inhibitor is magnesium oxide. Magnesium oxide can give the diaphragm high heat resistance and reduce the thermal shrinkage of the diaphragm on the basis of ensuring the original basic properties of polyolefin microporous diaphragm, thereby more effectively reducing the internal short circuit of lithium-ion battery and preventing the battery thermal runaway caused by the internal short circuit of the battery.
A preparation method of battery-grade nano magnesium oxide, the preparation method of battery-grade nano magnesium oxide includes the following steps: dispersing solid magnesium compound, organic dispersant and industrial alcohol in water to form a suspension; dispersing the suspension to obtain a dispersed slurry, crushing and grinding the dispersed slurry; centrifugally separating the crushed and ground slurry and collecting it, drying the filter cake to obtain a magnesium-containing precursor powder; roasting the magnesium-containing precursor powder, cooling to obtain magnesium oxide of different particle sizes, and vibrating and screening the magnesium oxide of different particle sizes to obtain battery-grade nano magnesium oxide.
The preparation method of this battery-grade nano magnesium oxide adopts the technology of “wet crushing – high temperature roasting – vibration screening”. The preparation process is simple, the cost is low, the equipment requirements are low, and the prepared magnesium oxide has high purity and small particle size.