Analysis of the development of NI/MH battery cathode materials

Source: 2020 - 04 - 05 13:37 hits: nickel metal hydride battery cathode material development of lanthanide metal was initially developed as a nickel metal hydride battery cathode materials. In 1973, ewe et al. ( 9] The first LaNi5 alloy used in the study of electrochemical hydrogen absorption and emission, but repeated cycle of hydrogen absorption and emission resulting in continuous degeneration of alloy, rapid attenuation in the alloy electrode discharge capacity, the charging and discharging cycle, thereby limiting the practical application of LaNi5 alloy in Ni/MH battery. In the mid - 1980 - s, WiLLiaMs [ 10] Adopt the method of element substitution la - was prepared nd- ni- 合作 A1 multicomponent alloy, etc. After hydrogen absorption, cell volume expansion rate of the alloy was obviously reduced, significantly increase the deposition resistance and corrosion resistance of alloy, greatly improving the alloy electrode electrochemical cycle life. In order to reduce cost, further improve the performance of alloy and other rare earth elements ( Such as CE, pr, Nd, sM, Y, and mixed rare earth mm) Partly replace a side, transition to another set of elements ( Such as company, manganese, copper, aluminum, iron, tin, chromium, etc. ) Partly replace ni B, a series of excellent alloy is prepared. Therefore, there is a variety of different performance in the world of rare earth base aB5 and aB5 + hydrogen storage alloys. Since then, mm - ni- 合作 mn- al- Ti and other aB5 hybridization of rare earth hydrogen storage alloy appeared, the maximum discharge capacity of up to 300 ~ 320 mah/g. At present, used in rare earth aB5 of nimh batteries and aB5 + x alloy has been realized in the world within the scope of industrialization, become the main anode materials of ni-mh battery industry at home and abroad. Nimh batteries into the practical phase, in 1988 in Japan in 1990 began to mass production, production doubled. At present, Toshiba, sanyo and panasonic in Japan has already formed the three-way structure, market share of 40%, 30% and 20% respectively. The scale of production has reached 15 million/month. In addition to the field of electronic information urgently need to be small, mobile power supply, nickel metal hydride batteries may become one of the electric vehicle power supply. By 2014, the nimh batteries in Japan's market value will be more than a hybrid car of lead-acid batteries. In 2014, the market value of the nimh batteries will reach 207. 8 billion yen, up 230% from 2008, and the market value of lead-acid battery will still be around 163. 2 billion yen. Hydrogen storage alloy and nickel metal hydride batteries in China research and development also started relatively early. Since 2005, the production of rare earth hydrogen storage material and nickel metal hydride batteries are more than the daily output. At the end of the '11th five-year', our country small nimh battery production reached 1. 1 billion, hydrogen storage alloy corresponding production capacity of 24000 tons/year, 17500 tons/year, account for more than 60% of global output, as the world's largest producer of hydrogen storage alloy. With modern portable electronic products, communications equipment and the rapid development of electric vehicles, as a chemical power source of nickel/metal hydride ( Ni / MH) Battery with high energy density, good charge/discharge resistor and clean pollution-free characteristics, has been widely used. Ni/MH battery development has now entered a new stage, especially in small battery high energy density, long life characteristics and hybrid or electric cars with high energy density, high power and long life battery has become a worldwide research and development of hot spots.