Hebei Messi Biology Co., Ltd. stated that in the positive electrode material of lithium batteries, nano magnesium oxide is used as a conductive dopant to generate magnesium-doped lithium iron manganese phosphate through solid phase reaction, and further made into a nanostructured positive electrode material, and its actual discharge capacity reaches 240mAh/g.
Optimize the capacity and cycle performance of spinel lithium manganese oxide batteries. In the electrolyte of lithium-ion batteries with spinel lithium manganese oxide as the positive electrode material, nano magnesium oxide is added as a deacidifying agent to remove acid, and the added amount is 0.5-20% of the weight of the electrolyte. By deacidifying the electrolyte, the content of free acid HF in the electrolyte is reduced to below 20ppm, reducing the dissolution effect of HF on LiMn2O4, and improving the capacity and cycle performance of LiMn2O4.
In the first step, an alkaline solution of nano magnesium oxide as a pH regulator and an ammonia solution as a complexing agent are mixed, and added to a mixed aqueous solution containing cobalt salt and nickel salt to coprecipitate Ni-CO composite hydroxide.
In the second step, lithium hydroxide is added to the Ni-CO composite hydroxide, and the mixture is heat treated at 280-420°C.
In the third step, the resulting product is heat treated at 650-750°C. Depending on the coprecipitation time, the average particle size of the lithium composite oxide is reduced or the packing density is increased. When the lithium composite oxide is used as an anode active material, a high-capacity lithium-ion secondary battery can be obtained, and the actual amount of magnesium oxide added depends on the specific formula.