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The role of nano magnesium oxide in lithium battery

Lithium-ion batteries are able to be recharged twice during use and are a kind of secondary rechargeable battery. The main working principle is the repeated movement of lithium ions between positive and negative electrodes, and the main components are electrolyte, positive electrode sheet, negative electrode sheet and diaphragm regardless of the shape of the battery.

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 cell phones and computers and trams.

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

Nano magnesium oxide is a new type of nanoparticle material, white powder in appearance, high purity, large specific surface area, composed of fine grains, with obvious small size effect, surface effect, quantum size effect and macroscopic tunneling effect, no gas inside the electrode, easier surface regeneration, small hydrogen and oxygen overpotential, cheap, etc., so it is more widely used.

Brief introduction of nano magnesium oxide added to lithium battery.

1. lithium ion battery choose to add 10-100g/L diameter between 0.05-10μm TiO2, SiO2, Cr2O3, ZrO2, CeO2, Fe2O3, BaSO, SiC, MgO and other insoluble solid particles, will be made as lithium ion has good charging and discharging efficiency, high specific capacity, stable cycle performance characteristics.

2. lithium battery cathode material, the nano magnesium oxide as a conductive dopant, through the solid phase reaction to generate magnesium doped lithium iron manganese phosphate, and further made of nanostructured cathode material, its conductivity up to 10-2S/cm, the actual discharge capacity of 240mAh/g. This new cathode material has high energy, environmental protection, low cost characteristics, suitable for liquid and colloidal lithium ion batteries, small and medium-sized polymer It is especially suitable for high-power power batteries.

3. Optimize the capacity and cycle performance of lithium spinel manganate batteries. In the lithium-ion battery electrolyte with lithium spinel manganate as the cathode material, add magnesium oxide nano as a deacidifier to remove acid, the amount of addition is 0.5-20% of the electrolyte weight. By de-acidifying the electrolyte, the content of free acid HF in the electrolyte is reduced to below 20 ppm, which reduces the dissolution effect of HF on LiMn2O4 and improves the capacity and cycling performance of LiMn2O4.

4. The alkali solution of magnesium oxide nanoparticles as pH adjuster and an aqueous ammonia solution as complexing agent were mixed and added to the mixed aqueous solution containing cobalt salt and nickel salt to co-precipitate Ni-CO composite hydroxide. Lithium hydroxide was added to the Ni-CO complex hydroxide and the mixture was heat treated at 280-420°C. The resulting product is heat-treated at 650-750°C, and the average particle size of the lithium composite oxide decreases or the stacking density increases as a result, depending on the time of co-precipitation. When 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 nanoparticles added depends on the specific formulation.

With the promotion of the use of magnesium oxide nano, it can obviously improve our ecological environment and achieve the effect of energy saving, which is of great significance for the lasting development of the country.


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