What are the specific roles of magnesium oxide in lithium batteries

The glassy carbon electrode made from nano-magnesium oxide has many characteristics, such as good stability to the battery, high conductivity, high purity, no gas in the electrode, easy surface regeneration, small hydrogen and oxygen overpotential, low price, etc. . However, these are more general statements, so what are the specific roles of magnesium oxide in lithium batteries?

First of all, the lithium-ion battery is selected to add 10-100g/L of insoluble solid particles such as TiO2, SiO2, Cr2O3, ZrO2, CeO2, Fe2O3, BaSO, SiC, MgO, etc. with a diameter between 0.05-10 μm; the prepared material is used as lithium ion It has the characteristics of good charge and discharge efficiency, high specific capacity and stable cycle performance.

Secondly, the cathode material of lithium battery uses nano-magnesium oxide as a conductive dopant, and generates magnesium-doped lithium iron manganese phosphate through solid-phase reaction, and further makes a nano-structured cathode material, and its actual discharge capacity reaches 240mAh/g. The new cathode material has the characteristics of high energy, safety and low price, and is suitable for liquid and colloidal lithium-ion batteries, small and medium-sized polymers, especially for high-power power batteries.

Then, the capacity and cycling performance of spinel lithium manganate batteries were optimized. In the lithium-ion battery electrolyte using spinel lithium manganate as the positive electrode material, nano-magnesium oxide is added as a deacidifying agent to remove acid, and the addition amount is 0.5-20% by weight of the electrolyte. By removing acid from the electrolyte, the content of free acid HF in the electrolyte is reduced to less than 20ppm, reducing the dissolution effect of HF on LiMn2O4, and improving the capacity and cycle performance of LiMn2O4.

Finally, in the first step, the alkaline solution of nano-magnesium oxide as a pH adjuster is mixed with an aqueous ammonia solution as a complexing agent, and added to the mixed aqueous solution containing cobalt salt and nickel salt to co-precipitate Ni-CO composite hydroxide thing.

In the second step, lithium hydroxide was added to the Ni-CO composite hydroxide, and the mixture was heat-treated at 280-420 °C.

In the third step, the product generated in the second step is heat-treated in an environment of 650-750 °C, and is related to the time of co-precipitation, and the average particle size of the lithium composite oxide decreases or the bulk density increases accordingly. When the lithium composite oxide is used as the anode active material, a high-capacity lithium-ion secondary battery can be obtained, and the actual addition amount of magnesium oxide depends on the specific formula.