Analyze the development of anode materials for NI/MH batteries

Development of cathode materials for nickel-hydrogen batteries Lanthanide alloys were originally developed as cathode materials for nickel-hydrogen batteries. In 1973, the ewe was etal. [9] The first LaNi5 alloy was used in the study of electrochemical hydrogen absorption and emission, but repeated hydrogen absorption and emission cycles led to continuous degradation of the alloy, resulting in rapid decay of the discharge capacity of the alloy electrode during the charge and discharge cycle, thereby limiting LaNi5 The practical application of the alloy is in Ni/MH batteries. In the mid-1980s, WiLLiaMs[10] prepared la-nd-ni-co-a1 and other multi-component alloys by element substitution method. After hydrogen is absorbed, the cell volume expansion rate of these alloys is significantly reduced, which significantly improves the anti-siltation and corrosion resistance of the alloy, and greatly improves the electrochemical cycle life of the alloy electrode. In order to reduce costs, further improve the performance of the alloy and partially replace one side with other rare earth elements (such as CE, PR, Nd, sM, Y, and mixed rare earth millimeters), and transition to another group of elements (such as company, manganese, copper, aluminum) , Iron, tin, chromium, etc.) to partially replace B Ni, a series of excellent alloys are prepared. Therefore, a variety of rare earth-based aB5 and aB5+ hydrogen storage alloys with different properties have appeared in the world. Since then, various aB5 hybrid rare earth hydrogen storage alloys such as mm-ni-co-mn-al-ti have come out one after another, and their maximum discharge capacity can reach 300-320MaH/g. At present, the rare earth aB5 and aB5+x alloys used in nickel-hydrogen batteries have been industrialized worldwide and have become important anode materials in the nickel-hydrogen battery industry at home and abroad. Ni-MH batteries entered the practical stage in 1988, and large-scale processing began in Japan in 1990, and the output doubled. At present, Toshiba, Sanyo and Panasonic have formed a three-way structure in Japan, with market shares of 40%, 30% and 20% respectively. The processing scale has reached 15 million per month. In addition to the small mobile power sources that are urgently needed in the field of electronic information, nickel-hydrogen batteries may become one of the power sources for electric vehicles. By 2014, the market value of nickel-metal hydride batteries in Japan will exceed that of lead-acid batteries for hybrid vehicles. In 2014, the market value of nickel-hydrogen batteries will reach 207.8 billion yen, an increase of 230% over 2008, while the market value of lead-acid batteries will still be around 163.2 billion yen. The research and development of hydrogen storage alloys and nickel-hydrogen batteries in my country also started early. Since 2005, the output of rare earth hydrogen storage materials and nickel-hydrogen batteries in my country has exceeded the daily output. At the end of the 11th Five-Year Plan, my country’s production of small nickel-metal hydride batteries reached 1.1 billion, and the corresponding output of hydrogen storage alloys reached 24,000 tons/year and 17,500 tons/year, accounting for more than 60% of global output, making China the world's largest hydrogen storage alloy processing country. . With the rapid development of modern portable electronic products, communication equipment and electric vehicles, nickel/metal hydride (Ni/MH) batteries as a chemical power source are characterized by their high energy density, good overcharge/discharge resistance, and clean and pollution-free Features have been widely used. Now the development of Ni/MH batteries has entered a new stage, especially small batteries with high energy density, long life characteristics and hybrid or electric vehicles with high energy density, high power and long life have become a worldwide research and Development hotspots. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Is it better to charge the lithium battery with fast charging or standard voltage charging?