The role of nano-sized magnesium oxide in lithium batteries

Lithium-ion battery can be charged twice in the process of use, which belongs to a kind of secondary rechargeable battery. The main working principle is the repeated movement of lithium ions between positive and negative electrodes. No matter what the shape of the battery is, the main components are electrolyte, positive electrode piece, negative electrode piece and diaphragm. At present, the international production of lithium-ion batteries is mainly concentrated in China, Japan and South Korea, and the main lithium ion application markets are mobile phones, computers and trams.

With the continuous development of lithium-ion battery, the application field is gradually expanding, and the use of its cathode materials has been transformed from a single to a diversified direction, including: olivine type lithium ferrous phosphate, lithium cobaltate layer, spinel type lithium manganate, etc., to achieve the coexistence of a variety of materials.

Nanometer magnesia (vitamin k – Mg30D) is a new type of nano particle material, the appearance of white powder, high purity, large specific surface area, is made up of tiny grain, has obvious small size effect, surface effect, quantum size effect and macroscopic tunnel effect, electrode is no easy, hydrogen and oxygen gases, surface potential small, cheap in price, Therefore, it is widely used.

Nano Magnesium Oxide (VK-Mg30D) Added to Lithium Battery

1. Choose to add 10-100g/L TiO2, SiO2, Cr2O3, ZrO2, CeO2, Fe2O3, Baso, SiC, MgO and other insoluble solid particles with diameter of 0.05-10μm for lithium ion battery. The material made as lithium ion has the characteristics of good charging and discharging efficiency, high specific capacity and stable cycling performance.

2. The cathode material of lithium battery, using nano-sized magnesium oxide (VK-Mg30D) as conductive dopant, generates magnesium, lithium, iron and manganese phosphate through solid phase reaction, and further makes the nano-structured cathode material, its conductivity can reach 10-2s /cm, and the actual discharge capacity can reach 240mAh/g. The new cathode material has the characteristics of high energy, environmental protection and low cost. It is suitable for liquid and colloid lithium ion batteries, small and medium-sized polymers, especially for power batteries with high power.

3. Optimize the capacity and cycling performance of spinel lithium manganate batteries. Nanometer magnesium oxide (VK-Mg30D) was added as deacidifying agent in the electrolyte of lithium ion battery with spinel lithium manganate as cathode material. The addition amount was 0.5-20% of the weight of the electrolyte. By deacidifying the electrolyte, the content of free acid HF in the electrolyte was reduced to less than 20ppm, the dissolution of LiMn2O4 by HF was reduced, and the capacity and cycling performance of LiMn2O4 were improved.

4. Nanometer magnesium oxide (VK-Mg30D) is mixed with an ammonia solution as a complexing agent as an alkali solution of pH regulator, and is added to the mixed aqueous solution containing cobalt salt and nickel salt to co-precipitate Ni-Co compound hydroxide. Lithium hydroxide was added to the Ni-Co composite hydroxide and the mixture was heat treated at 280-420℃. The generated products are heat treated in the environment of 650-750℃, which is related to the time of co-precipitation. Therefore, the average particle size of lithium composite oxides decreases or the bulk density increases. When lithium composite oxide is used as the anode active material, a lithium ion secondary battery with high capacitance can be obtained, and the actual addition amount of nano-magnesium oxide (VK-Mg30D) depends on the specific formula.

With the popularization and use of nano-sized magnesium oxide, it can significantly improve our ecological environment and achieve the effect of energy saving, which is of great significance for the sustainable development of the country.

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