Cathode materials have been the bottleneck to improve the performance and reduce the cost of lithium-ion batteries. Lithium iron phosphate is the first choice of cathode materials for modern commercial lithium-ion batteries because of its low price, high energy density, long life and good safety. However, the low electronic conductivity of lithium iron phosphate seriously hinders its application in the field of power and energy storage batteries.

Tungsten disulfide (WS₂) is a kind of layered solid lubricant with structure similar to graphite. It has excellent high temperature resistance, extreme pressure resistance, good adsorption capacity on metal surface and low thermal conductivity. WS₂ was first applied to the lubrication of the key parts of the American mariner spacecraft, and it was used to prepare high temperature extreme pressure grease and energy-saving engine lubricating oil, with good application results.

At present, China's major cities are booming in the construction of rail transit projects. Because of its unparalleled advantages, shield method has been widely used in the construction of rail transit tunnels.

In recent years, the appearance of nano material artificial analogy peroxidase can effectively overcome the above shortcomings of natural enzyme, showing strong catalytic activity and specificity. The quantum size effect, small size effect, interface effect, surface effect and macro quantum tunneling effect of nano tungsten oxide make it have more advantages in optical, magnetic, catalytic and chemical activities. Based on the quantum effect, quantum dots have a wide range of applications in solar cells, light-emitting devices, optical biomarkers and other fields.

The photoelectrochemical cell (PEC), which decomposes water to produce hydrogen and converts solar energy into chemical energy, is considered to be one of the most important ways to obtain energy instead of fossil energy. It is an important research direction in this field to find and study potential semiconductor materials by various methods.

As the name implies, violet tungsten oxide refers to a kind of tungsten oxide with a violet color. It is one of the stable oxides of tungsten, together with WO₃, WO_2.90 and WO₂. Why violet tungsten oxide is violet. It is closely related to its light absorption property.

Violet tungsten oxide of a dark purple to pure purple color is one of the four stable oxides of tungsten. It is composed of tungsten copper, tungsten trioxide and other different components. And the components and their quantities depend on the specific preparation method.

Tungsten disulfide does exist in nature, but the quantity is very rare. Therefore, tungsten disulfide is usually prepared by various chemical methods. Preparation methods of tungsten disulfide include hydrothermal method, mechanical stripping method, chemical vapor deposition method and so on.

Tungsten disulfide has high application value in the lubrication of rotating shaft in notebook. It can not only improve the lubricating performance and wear resistance of rotating shaft itself, but extend its service life, reducing the failure rate of notebook greatly.

Tungsten disulfide with good lubricating performance is suitable for the working environment of high temperature and heavy load. Therefore, it has high application value in the lubrication of cylindrical roller bearing. It can not only reduce the wear on bearing surface, but improve the service life of the bearing.