With the rapid development of the new energy industry, the demand for anti-corrosion heating equipment in lithium battery manufacturing is growing rapidly. Lithium battery production involves various corrosive chemical media and has extremely high requirements for product cleanliness and impurity control. PFA anti-corrosion heaters, with their excellent universal corrosion resistance and ultra-low ion precipitation characteristics, have gradually become the preferred heating solution for many key processes in lithium battery manufacturing.
The corrosion environment in lithium battery production is complex and diverse. In the front-end material preparation stage, strong acids such as sulfuric acid, hydrochloric acid and nitric acid are used in the leaching and purification of positive electrode materials, which are highly corrosive; in the electrolyte production process, lithium hexafluorophosphate and various organic solvents will release hydrofluoric acid when encountering water, which is extremely corrosive to metals; in the wet-process diaphragm and coating processes, various corrosive additives and solvents are also used. In addition, lithium battery production has extremely strict requirements for metal ion pollution, and trace metal precipitation will seriously affect battery performance and safety.
In the manufacturing process of positive electrode materials, PFA heaters are mainly used for heating reaction kettles and leaching tanks. In the wet smelting and purification process of precursors such as lithium iron phosphate and ternary materials, the acid leaching solution has strong corrosion, and stainless steel heating pipes are easily corroded and precipitate iron, chromium and nickel ions, which will affect the electrochemical performance of the materials. PFA heaters can not only withstand the corrosion of various strong acids, but also will not precipitate any metal ions, ensuring the purity of the materials.
In electrolyte production and battery manufacturing, high-purity PFA heaters have greater value. The electrolyte system containing lithium hexafluorophosphate will produce hydrofluoric acid after hydrolysis, which has strong corrosion to almost all metals. PFA material can stably resist the corrosion of hydrofluoric acid and organic solvents at medium temperature, and will not introduce impurity ions, ensuring the quality of the electrolyte. In addition, PFA heaters are also used in heating processes such as diaphragm coating and electrode slurry preparation to meet the requirements of corrosion resistance and cleanliness.
For the lithium battery industry, PFA heaters have special requirements. First, high purity - electronic grade or even battery grade high-purity PFA resin should be selected to strictly control metal ion precipitation. Second, structural optimization - design smooth and non-scaling structures according to process characteristics to reduce the impact of scaling on product quality. Third, safety and reliability - the lithium battery industry has high safety requirements, and heaters need complete leakage protection and over-temperature protection functions.
In addition to lithium batteries, PFA heaters are also used in other new energy fields such as hydrogen energy and photovoltaic manufacturing. In the hydrogen energy industry, they are used for heating proton exchange membrane related solutions; in the photovoltaic industry, they are used for heating silicon wafer cleaning solutions. The rapid development of the new energy industry is driving the continuous upgrading of PFA heater technology.
Table 1 Application of PFA Heaters in Typical Lithium Battery Processes
表格
| Production Process | Main Corrosive Medium | PFA Heater Type | Core Requirement |
|---|---|---|---|
| Cathode Material Leaching | Sulfuric acid, hydrochloric acid, metal salts | Industrial-grade thickened PFA | Acid corrosion resistance, no ion precipitation |
| Electrolyte Production | LiPF₆, organic solvent, trace HF | High-purity electronic grade PFA | Ultra-low precipitation, HF resistance |
| Diaphragm Coating | Organic solvent, polymer emulsion | Standard high-purity PFA | Uniform heating, cleanliness |
| Slurry Preparation | Various additives, solvent | Standard PFA | Non-stick, easy to clean |
| Waste Liquid Treatment | Mixed acid-base waste liquid | Industrial-grade PFA | Universal corrosion resistance |
With the advantages of universal corrosion resistance and high cleanliness, PFA heaters are playing an increasingly important role in the new energy and lithium battery manufacturing industries.
