Polyvinylpyrrolidone, short for PVP with CAS 9003-39-8, is one of the important excipients advocated internationally. PVP is a white to milky white powder. Easily soluble in water, alcohol, amines and halogenated hydrocarbons, but insoluble in acetone, ether, etc. It has excellent solubility, biocompatibility, physiological inertness, film-forming properties, film protection ability and the ability to combine various organic and inorganic compounds, and is relatively stable to acids, salts and heat.
Polyvinylpyrrolidone has different K value. The K value of PVP is a characteristic value related to the relative viscosity of PVP aqueous solution, which actually reflects the average molecular weight of PVP. The larger the K value, the greater the viscosity of PVP and the stronger the adhesiveness. PVP is divided into four levels according to its average molecular weight. It is customary to express it by K value. Different K values represent the corresponding average molecular weight range of PVP. Therefore, K value is not only a physical quantity characterizing the molecular weight of PVP, but also an important parameter to evaluate its performance and application potential.
| TYPE | PVP K12 | PVP K15 | PVP K17 | PVP K25 | PVP K30 | PVP K60 | PVP K90 | |
| Appearance | White powder | |||||||
| K Value | 10.2-13.8 | 12.75-17.25 | 15.3-18.36 | 22.5-27.0 | 27-32.4 | 54-64.8 | 81-97.2 | |
| NVP | %max | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Water % max | 5.0 | 5.0 | 5.0 | 5.0 | 5.0 | 5.0 | 5.0 | |
| Content % min | 95 | 95 | 95 | 95 | 95 | 95 | 95 | |
| pH (5% aqueous solution) | 3.0-5.0 | 3.0-5.0 | 3.0-5.0 | 3.0-5.0 | 3.0-5.0 | 4.0-7.0 | 4.0-7.0 | |
| Sulfate ash% max | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | |
| Nitrogen content﹪ | 11.5-12.8 | 11.5-12.8 | 11.5-12.8 | 11.5-12.8 | 11.5-12.8 | 11.5-12.8 | 11.5-12.8 | |
| 2-P content % max | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | |
| Aldehyde ppm max | 500 | 500 | 500 | 500 | 500 | 500 | 500 | |
| Heavy metal ppm max | 10 | 10 | 10 | 10 | 10 | 10 | 10 | |
| Hydrazine ppm max | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |
| Hydrogen peroxide ppm max | 400 | 400 | 400 | 400 | 400 | 400 | 400 | |
Among different K values, PVP K30 and PVP K90 are the most popular and widely used products. They have the ability to protect the body and the ability to combine various organic and inorganic compounds, and is relatively stable to acids, salts and heat. It has application properties such as adhesion, film-forming, dispersion and thickening. Therefore, PVP has a wide range of applications in different industries.
As the core of electric vehicles, portable electronic devices, and energy storage solutions, the performance and reliability of lithium batteries directly affect our quality of life and environmental sustainability. As the demand for clean energy continues to grow, lithium-ion batteries play a vital role in electric vehicles and renewable energy systems. The unique chemical properties of PVP make it one of the ideal materials for manufacturing high-performance batteries.
The application of PVP in lithium batteries mainly includes serving as a dispersant for electrode materials and a processing aid for conductive materials to optimize battery performance and stability.
The application of PVP in lithium batteries is mainly reflected in the following aspects:
As a dispersant for electrode materials: PVP can enhance the adhesion and dispersion of electrode materials and ensure that active materials and conductive agents are evenly distributed on the electrodes, which is crucial for improving battery performance and efficiency. It improves battery charge and discharge cycles and extends battery life.
As a processing aid for conductive materials: PVP is widely used in the field of lithium-ion batteries as a dispersant for electrode materials and a processing aid for conductive materials to optimize battery performance and stability. It helps prevent agglomeration and deposition of electrode materials, thereby improving battery safety.
Application in lithium iron phosphate battery cathode slurry: PVP is used as a dispersant for the conductive agent carbon nanotubes in the lithium iron phosphate battery cathode slurry, effectively dispersing the carbon nanotubes, thereby producing a cathode slurry with excellent performance. This helps improve battery performance, increase battery charge and discharge capacity, and reduce battery temperature rise during discharge.
Industry development trends: With the rapid growth of lithium iron phosphate battery production, the application of PVP in the field of new energy power batteries is also increasing. As the market size of lithium iron phosphate batteries continues to grow, the demand for PVP products has also increased, which provides broad market prospects for the application of PVP in the field of new energy power batteries.
In summary, PVP plays an important role in lithium battery manufacturing through its unique chemical properties. It not only improves the performance and efficiency of the battery, but also extends the service life of the battery, especially in the cathode slurry of lithium iron phosphate batteries. Its application in the field of new energy has further promoted its widespread application in the field of new energy.
