Column rechargeable battery

　　Salt can add new battery performance? New technology can be used in battery electrodes and improve capacitance

　　Scientists have discovered that by putting salt into a supramolecular sponge and placing it in a high-temperature baking environment, the sponge can be turned into a carbon-based structure. The salt reacts with the metal sponge in a special way, changing the sponge from a homogeneous substance into a complex structure with fibers, scaffolds and meshes. This 3D carbon structure can promote electrolyte ion migration when used as a battery negative electrode, but Difficult to make in the laboratory.

　　According to his research in the Journal of the American Chemical Society, if this material is used in lithium-ion batteries, it will not only increase the charging speed of the battery, but also increase the capacity. Since diatoms in nature also have complex structures, researchers named the material "nano-diatoms" and believe that nano-diatoms can also be used for energy storage and energy conversion, such as electrocatalysts for hydrogen fuel. .

　　Dr. Stoyan Smoukov from the School of Engineering and Materials Science at Queen Mary University of London said that this metamorphosis (metamorphosis) only occurs when the compound is heated to 800 degrees Celsius, and the team also found that carbonization can be controlled by changing the chemical composition.

　　The multi-layered 3D carbon-based nanostructure not only has physical properties such as good conductivity, but can also be made into lightweight structural materials or improve the wettability of carbon materials to promote ion flow. But it's very difficult to make 3D carbon-based nanostructures, let alone do them in a simple way.

　　The supramolecular sponge used in the study is a metal organic framework material (MOF). This porous material has potential applications such as gas storage. Generally speaking, the surface area of MOF sponge will increase after carbonization, and it can become a new force in electrode materials. However, studies have found that carbonized MOF only forms random carbon derivatives. Fortunately, the team finally discovered that after salt carbonization of the MOF sponge, random carbon derivatives can be transformed into complex and orderly multi-layered carbon-based materials.

　　Dr. R. Vasant Kumar from the Institute of Energy Research at the University of Cambridge said that this research will push MOF applications to another stage. This multilayer carbon-based material manufacturing method can be used not only in energy storage technology in the future, but also in energy conversion and chemical sensing.

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