Nano magnesium oxide is a new type of nano-particle material, white powder in appearance, high purity, large specific surface area, composed of very fine grains, good dispersion, relative density of about 3.58 (25 ℃). Melting point 2852℃, boiling point 3600℃. Difficult to dissolve in water, insoluble in alcohol, soluble in acid or ammonium salt solution. Nanoscale magnesium oxide has small size effect, surface effect, quantum size effect and macroscopic tunneling effect, modified treatment, no agglomeration phenomenon, in optics, catalysis, magnetism, mechanics, chemical industry and so on has many functions and important application value, the prospect is very broad. So what are the applications of nanometer magnesium oxide in lithium battery? Follow the editorial below.
Nano magnesium oxide in lithium battery has the following characteristics:
Physical and chemical properties: nano magnesium oxide has significant small size effect, surface effect, quantum size effect and macroscopic tunneling effect, these properties give nano magnesium oxide very high specific surface area and reactivity, so that it shows unique advantages in the field of electronics, magnetism, mechanics and chemical industry, etc. .
Energy density enhancement: nanometer magnesium oxide, as a conductive dopant, combines with lithium, iron, manganese and manganese phosphates and other materials through solid-phase reaction to form nano-structured anode materials. This material not only has high conductivity, but also has an actual discharge capacity of up to 240mAh/g, which is much higher than that of traditional anode materials, significantly improving the energy density of the battery.
Cycling performance and stability: Nano-magnesium oxide can stabilize the lattice structure, reduce the volume change of the material during charging and discharging, and delay the capacity decay. Meanwhile, as a deacidifier, nano-magnesium oxide can reduce the free acid content in the electrolyte and alleviate the dissolving effect of acid on the cathode material, further improving the cycling performance and stability of the battery.
Conductivity and safety: as a conductive dopant, nanomagnesium oxide can significantly increase the conductivity of the anode material and promote the rapid migration of lithium ions, thus improving the charging and discharging efficiency and power density of the battery. In addition, nano-magnesium oxide can be used as a solid electrolyte material to replace the traditional liquid electrolyte and improve the safety of lithium batteries.
The applications of nano-magnesium oxide in lithium batteries mainly include the following aspects:
Anode materials: nano-magnesium oxide can be used as a conductive dopant to produce anode materials such as magnesium-doped lithium iron-manganese phosphates through solid-state interaction. These materials not only have high conductivity and discharge capacity, but also suitable for small and medium-sized polymer, colloidal and liquid lithium-ion batteries, especially for high-power power battery.
Anode materials: In the high-capacity tin-complex anode materials for lithium-ion batteries, the addition of magnesium oxide particles with diameters of 20-30 nanometers can improve the specific capacity and first-time charging and discharging efficiencies of the anode materials while maintaining the stability of the cycling performance.
Electrolyte modification: Nano magnesium oxide can be used as a deacidifying agent to remove free acid (e.g., HF) in the electrolyte, reducing the corrosive effect on the cathode material and improving the cycle stability and safety of the battery.
Other applications: nano-magnesium oxide can also be used as an electrolyte additive to optimize the formulation and performance of electrolyte; it is also widely used in the polishing of glass-carbon electrode materials.
In summary, the application of nano-magnesium oxide in lithium batteries not only improves the energy density and cycling performance of the battery, but also enhances the safety and electrical conductivity of the battery, which is of broad and far-reaching significance.