Supercapacitors are an emerging class of high-performance energy storage devices. Compared to traditional batteries and capacitors, they have special advantages such as high energy density, high output power, long lifespan, and good safety. The microporous aluminum foil current collector is one of the important components for achieving high energy density and high output power of supercapacitors.
Micro porous aluminum foilThe current collector refers to an aluminum foil current collector with a large number of pores appearing on the surface of the aluminum foil, mainly composed of microporous aluminum foil and active materials. During the preparation process of microporous aluminum foil, chemical etching or electrochemical etching techniques are used to passivate and corrode the dense part of the aluminum foil surface, leaving the remaining aluminum foil with micrometer level "pore" structures. This special pore structure can significantly increase the surface area of aluminum foil, enhance sealing performance, and better adhere to electrode active materials. In addition, after coating with active materials, the diffusion and transfer ability of substances in the pores is further improved, thereby increasing the energy density and output power of supercapacitors, improving the electrochemical performance of electrode reactions, and enabling supercapacitors to have better performance.
There are many advantages to using microporous aluminum foil current collectors for supercapacitors, among which the most important ones include:
1. Improving energy density: Due to the pore structure of microporous aluminum foil, the surface area of the foil can be increased. Therefore, by coating the active material, the effective surface area of the electrode can be significantly increased, and the energy density of the capacitor can also be significantly improved.
2. Improve output power: The high-capacity spreading of active materials and the high conductivity of microporous aluminum foil can enable supercapacitors to better absorb and release charges, thereby significantly increasing output power.
3. Improving lifespan: Due to the excellent sealing performance of microporous aluminum foil, the volatilization of active materials or the oxidation of electrode surfaces can be significantly reduced, thereby improving the lifespan of supercapacitors.
4. Good cutting performance: Micro porous aluminum foil can be cut into various shapes and sizes, with good flexibility and the ability to adapt to different structural design requirements.
At present, microporous aluminum foil current collectors for supercapacitors are widely used in fields such as energy recovery circuits, electric vehicles, and medical devices. Their performance continues to improve and their application areas continue to expand.
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