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Sodium hexafluorophosphate is an important inorganic compound with a unique chemical structure and broad application prospects. The appearance is a white crystalline solid that is stable at room temperature, incompatible with strong acids, highly soluble in water, and also soluble in organic solvents such as methanol, ethanol, acetone, and ethyl acetate. It is commonly used as an electrolyte, especially in lithium-ion batteries. It has high ion conductivity and can provide channels for ion transport, promoting the normal operation of the battery.
Additional information of chemical compound:
|
Chemical Formula |
F6NaP |
|
Exact Mass |
167.95 |
|
Molecular Weight |
167.95 |
|
m/z |
167.95 (100.0%) |
|
Elemental Analysis |
F, 67.87; Na, 13.69; P, 18.44 |
|
Melting point |
>200 °C (lit.) |
|
Density |
2.369 g/mL at 25 °C (lit.) |
|
|
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In lithium-ion batteries, sodium hexafluorophosphate is usually used as an electrolyte between the positive and negative electrodes, helping lithium ions to travel back and forth between the two poles and providing a stable electrochemical environment to prevent adverse reactions inside the battery. It is also an electrolyte used in sodium ion batteries, which has a significant impact on the manufacturing and performance of sodium batteries. Sodium hexafluorophosphate also plays a key role in the configuration of electrolytes and can be used to produce other hexafluorophosphate salts, with wide chemical application value.
The preparation of sodium hexafluorophosphate is usually achieved through chemical reactions, and one of the common preparation methods is as follows:
Reaction equation:PCl5+NaCl+6HF→NaPF6+6HCl
Preparation steps:
A vessel made of corrosion-resistant materials such as stainless steel, nickel, copper, nickel alloy, etc., with a diameter of 3 inches (approximately 76.2mm) and a height of 7 inches (approximately 177.8mm).
Put half of the amount of sodium chloride into a container and cover it with a lid. Cool the container in an ice salt bath and connect it to an anhydrous hydrogen fluoride tank.
Open the valve and place approximately 400mL of HF liquid into the container. At this point, the liquid level in the stainless steel container is about 3/4 inch (approximately 19.05mm). Insert a thin wooden strip into the middle pipe, and the part immersed in the liquid will turn black, thus roughly measuring the height of the liquid level.
To ensure complete dissolution of sodium chloride, remove the lid and stir with a stainless steel spoon with a handle. Slowly add about 150g (about 0.75mol) of PCl ₅ and add it to the solution through a spoon (place it against the wall of the container). Sodium hexafluorophosphate immediately precipitates and is stirred occasionally to complete the reaction.
Due to the intense reaction, measures should be taken to prevent the splashing of liquid hydrogen fluoride. The operator must wear thick rubber gloves and preferably operate behind a protective cover. After all PCl ₅ has been added, remove the lid and place the container in an oil bath to evaporate the remaining hydrogen fluoride.
Dry nitrogen gas is introduced into the container and heated to about 150 ℃ to remove trace amounts of hydrogen fluoride. The crude product yield is almost the theoretical calculation, with a purity of over 95%. The impurities are mainly trace iron salts and a small amount of unreacted fluoride.
Dissolve the crude product in methanol (add 60g of product to 100mL of solvent), add an appropriate amount of 5% NaOH methanol solution to maintain the alkalinity of the solution, test with phenolphthalein, and centrifuge to remove insoluble impurities. The solvent is removed by concentration and crystallized under reduced pressure to obtain monohydrate. It is then placed in a dryer containing concentrated sulfuric acid and dried to obtain anhydrous salt.
Sodium Hexafluorophosphate (NaPF6) is an inorganic sodium salt with the chemical formula NaPF ₆. It has attracted much attention for its unique chemical properties and wide range of applications. The following is a detailed description of its purpose:
Battery field
It is one of the commonly used electrolytes in lithium-ion batteries. In lithium-ion batteries, electrolytes play a role in conducting lithium ions, which is crucial for the performance and cycle life of the battery. Sodium hexafluorophosphate has high ionic conductivity, which can provide a stable electrochemical environment and promote the transport of lithium ions. Compared with other electrolyte materials, it has better thermal and chemical stability, and can maintain stable performance over a wide temperature range.
Sodium ion battery electrolyte
With the rapid development of the new energy industry, sodium ion batteries, as a battery technology with abundant resources and low cost, have received widespread attention. Sodium hexafluorophosphate is also suitable as an electrolyte material for sodium ion batteries. It can provide a stable sodium ion transport channel, improving the performance and cycle life of the battery. In sodium ion batteries, the application of sodium hexafluorophosphate is expected to reduce battery costs, improve battery energy density and safety.
In the field of chemical analysis
In chemical analysis, the determination of metal ions is one of the common tasks. However, due to the fact that metal ions often exist in various forms in aqueous solutions and interference may occur between different ions, improving the selectivity and sensitivity of the measurement becomes crucial. It can be used as an ion pairing agent to form stable complexes with metal ions, thereby changing the chemical properties of metal ions and improving the selectivity and sensitivity of measurements.
For example, sodium hexafluorophosphate can form stable complexes with cobalt (II) ions and be used to determine the cobalt (II) ion content in water samples. By adding an appropriate amount of sodium hexafluorophosphate, cobalt (II) ions can be separated from other interfering ions, thereby improving the accuracy of the measurement. In addition, sodium hexafluorophosphate can also form complexes with other metal ions such as iron (III), nickel (II), etc.
for the determination of these ions. The mechanism by which it forms complexes with metal ions mainly involves the principles of coordination chemistry. Hexafluorophosphate ion (PF ₆⁻) has six fluorine atoms, which can act as coordination atoms to form coordination bonds with metal ions. When sodium hexafluorophosphate is mixed with metal ions, the hexafluorophosphate ion will undergo coordination reaction with the metal ion to form a stable complex. These complexes typically have specific color and spectral characteristics that can be used for quantitative analysis.
Application in chromatographic analysis
In chromatographic analysis, the choice of mobile phase has a significant impact on separation efficiency and accuracy of analysis results. Sodium hexafluorophosphate can be used as a mobile phase additive to improve the separation performance of chromatographic columns and the accuracy of analytical results. For example, in ion chromatography (IC) analysis, it is often necessary to add mobile phase additives to improve the separation efficiency of the chromatographic column.
At this point, an appropriate amount of sodium hexafluorophosphate can be added as a mobile phase additive to achieve better separation of ions in the sample on the chromatographic column, thereby improving the accuracy and repeatability of the analysis results. Chromatographic analysis is a method of separation and analysis based on the distribution differences of different components in the sample between the stationary phase and the mobile phase.
In the chromatographic column, different components in the sample will interact with the stationary phase, resulting in separation on the chromatographic column. The mobile phase is responsible for introducing the sample into the chromatographic column and washing it out. Sodium hexafluorophosphate, as a mobile phase additive, can change the properties of the mobile phase, such as ionic strength, pH value, etc., thereby affecting the distribution differences of different components in the sample on the chromatographic column, improving separation efficiency and accuracy of analysis results.
In materials science, surface analysis is an important means of understanding the surface properties and structure of materials. It can be used as a surface analysis reagent to determine the elemental composition, chemical bonding state, and other information on the surface of materials. For example, in X-ray photoelectron spectroscopy (XPS) analysis, it is often necessary to add surface analysis reagents to improve the accuracy and reliability of the analysis results. At this point, an appropriate amount of sodium hexafluorophosphate can be added as a surface analysis reagent to better determine the elemental composition and chemical bonding state of the material surface.
It can also be used in the field of material modification. By compounding or doping it with other materials, the properties of the material can be improved, such as conductivity, thermal stability, mechanical properties, etc. For example, adding an appropriate amount of sodium hexafluorophosphate to certain polymer materials can improve their conductivity and thermal stability. In addition, sodium hexafluorophosphate can also be used to prepare nanomaterials with special functions, such as catalyst carriers, sensor materials, etc.
FAQ
What is napf6 used for?
Sodium hexafluorophosphate is an inorganic compound with the chemical formula NaPF6. Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). It has been used as a component of a non-aqueous electrolyte in rechargeable sodium-ion batteries.
How to make sodium hexafluorophosphate?
The synthesis method of the sodium hexafluorophosphate comprises the following steps: s1: refining industrial hydrofluoric acid: the industrial hydrofluoric acid is purified into high-purity anhydrous hydrofluoric acid through rectification, the rectification temperature is controlled to be 20-28 ℃, and the condenser ...
What is another name for sodium hexametaphosphate?
Sodium hexametaphosphate detergents, calgon, giltex, quadrafos, hagan phosphate, micromet: mixtures containing Graham's salt as principal agent.
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