In recent years, the nickel-based rechargeable batteries rapid development, in the military, defense, high-tech and other fields are increasingly practical use, such as mobile phones, laptop computers, video recorders, etc., the demand of metal hydrides and other high-capacity battery increase year after year.
In addition, nickel-based rechargeable batteries as electric vehicle power also has some competitive. Therefore, study on this type of battery electrode materials is of great significance.
Three-dimensional network-like structure of fibers nickel and hollow fibers nickel substrate having conductive properties, the base mass is small and resilient and other advantages, is the key material of sealed secondary nickel-based batteries positive electrode. The substrate electrodes made by them having a high specific volume, high charge and discharge efficiency, and the electrode stability. Since the 1980s, the United States, France, Germany, Japan and other countries have started the research work of fibrous nickel electrodes, Chinese scientists have proposed using the hydrothermal method to prepare nickel fiber. But the research and application of hollow fiber nickel substrate, electrode spoon prepared was made in this century. Porous nickel substrate, such as foamed nickel substrate, light containing fiber nickel substrate research, is one of the key issues to improve the performance of nickel-metal hydride battery. Electrode is made of substrate filling active material. Currently the conventional use nickel fiber felt electrode and the foam nickel electrode due to big internal resistance, resulting in the discharge voltage reduced when high discharging. While the pure nickel powder sintered electrode material, because of low porosity, the active material load is low. In contrast, the hollow fiber elastic nickel electrode with high resilience, provide favorable conditions for the active substance during the discharge volume shrinkage stress relief and the active substance with high load capacity. Therefore, China conducted with hollow fibers prepared sintering nickel-base and nickel-base hollow fiber preparation process is made the nickel powder and the hollow nickel fibers and pore forming materials into slurry, removing the gas, then in the perforated plate Ni thin scraping pulp, dried, and then sintered 20-30min at 1300K cracking ammonia gas atmosphere to obtain porous nickel substrate.
At 100% hollow nickel fiber substrate, hollow nickel fiber interspersed with each other to form a network structure, nickel particles connected to the network structure of the gap, this structure can improve the porosity of the substrate and conductive connection. Many experiments show that, the electrode prepared by hollow nickel fiber has good electrochemical performance, we can see that the hollow nickel fiber in nickel-based chemistry battery applications has good prospects, the basic research of preparing hollow nickel fiber new method has important theoretical and practical significance.
With the electronics industry rapid development, waste batteries had become an important source of pollution. These batteries contain a number of expensive or toxic substance, they must be recycled in order to mitigate the potential harm to the environment. Waste batteries pollute the environment, but full of treasure, recycling waste batteries can reduce the environmental pollution and can create value once again. For example, the nickel-metal hydride batteries contain nickel hydroxide, rare earth hydrogen storage alloys, nickel-cadmium batteries contain toxic nickel hydroxide and cadmium hydroxide, they both have economic recovery and social benefits to be recycled. According to metal powder supplier, waste nickel-based batteries is a "misplaced resources", which contains a large number of nickel, cobalt, iron, stainless steel and other useful components, and certain metal components in nature are the scarce resources, if it thrown away, it will cause tremendous waste of resources.
Source:http://www.mhcmp.com
The application of tungsten in various industries
Steel Industry Most of tungsten applied in the production of special steels. The widely used high-speed steel was containing 9-24% of tungsten, 3.8-4.6% of chromium, 1-5% of vanadium, 4-7% of cobalt, 0.7-1.5% of carbon.
Magic effects of coconut oil
According to records, coconut oil can be regarded as the nobility of skin care plant extracts. It was rich in exotic tension of tropical plants, which can enhance the contractile force of the pores, perfectly beautify and nourish the skin.
Exploring the Potentials of Nano-Aluminum Powder
Nano-aluminum powder, a material with remarkable properties due to its minuscule particle size, is revolutionizing various industries with its high reactivity and large specific surface area. Unlike its bulk counterpart, nano-aluminum powder begins to oxidize at a lower temperature of 550°C, compared to the 950°C oxidation point of ordinary aluminum. This lower ignition energy and full combustion without apparent cohesion make it a superior choice for applications requiring high energy and efficiency. The unique characteristics of nano-aluminum powder, such as faster burning rates and greater heat release, are largely influenced by its synthesis method, which determines its particle size, surface area, and shape.
