Cadmium is a heavy metal whose compounds have certain applications in industry, agriculture and scientific research. The following are the main functions and applications of cadmium compounds: 1. Industrial application Battery manufacturing: Cadmium is widely used in nickel-cadmium batteries (NiCd batteries). It has good charging performance and stable voltage. It is a common battery material in portable devices (such as wireless phones and digital cameras). Paints and pigments: Cadmium compounds (such as cadmium red and cadmium yellow) are used to make paints and pigments. Because of their bright colors and light and heat resistance, they are suitable for artistic paints and industrial coatings. 2. Catalyst chemical reaction catalysis: Certain cadmium compounds can be used as catalysts in organic synthesis processes to promote specific chemical reactions. 3. Optical materials Photosensitive materials: Cadmium selenide (CdSe) is an important semiconductor material used in the manufacture of photovoltaic cells, lasers and light-emitting diodes (LEDs).