NiMH battery cathode material was developed -Lithium - Ion Battery Equipment

NiMH battery cathode material was developed by Inner Mongolia -Lithium - Ion Battery Equipment

Recently, Inner Mongolia Siaoke Hydrogen Storage Alloy Co., Ltd., the key project undertaker of the National Torch Plan, broke the foreign technical barriers and developed a nickel hydrogen battery cathode material for hybrid electric vehicles with fully independent intellectual property rights, which was accepted by experts organized by the Science and Technology Department of the Autonomous Region. The NiMH battery hydrogen storage alloy developed in the project has solved the problem that the high specific surface area makes it particularly easy to be oxidized and the poor contact leads to further decline in conductivity and thermal conductivity, and has conquered a key technology for the localization of new energy power vehicles.

The performance of nickel metal hydride (NiMH) power battery is related to the performance of its cathode material, cathode material, diaphragm and electrolyte, as well as various electrochemical behaviors of these materials when electrochemical reactions occur. Among them, hydrogen storage alloy is one of the very important influencing factors affecting the performance of nickel metal hydride power battery. At present, the common AB5 hydrogen storage alloy on the market can not meet the development needs of nickel hydrogen battery. Inner Mongolia Siaoke Hydrogen Storage Alloy Co., Ltd. began to implement the torch plan - "Industrialization of Ni MH Battery Hydrogen Storage Alloy for Hybrid Electric Vehicles" project in 2014. After three years of research, design and development, two types of power type hydrogen storage alloys were produced and applied to the power type Ni MH battery, making the discharge capacity of the power type Ni MH battery reach 84.4% of the normal temperature when the high temperature is 60 ℃; After 800 weeks of recycling, the capacity retention rate reached 85.3%.

In the research and development of AB5 type dynamic hydrogen storage alloy, the rate discharge performance and low-temperature discharge performance of the alloy were improved by adjusting the proportion of light rare earth lanthanum and cerium in the alloy; The microstructure, phase composition, equilibrium hydrogen pressure, discharge capacity, activation performance, cycle life and high rate discharge performance of the alloy were improved by stoichiometry; The PCT platform pressure suitable for dynamic hydrogen storage alloy was obtained by adjusting the manganese content in the alloy. In terms of surface treatment technology of hydrogen storage alloy powder, scientific and technological personnel took the lead in using vacuum evaporation coating method at home and abroad to study the surface treatment of hydrogen storage alloy powder by coating metal nickel, copper and aluminum. The results show that the vacuum evaporation metal coating technology can obtain a uniform metal coating with good corrosion resistance and conductivity on the surface of alloy powder without destroying the original composition and structure of the alloy. It can overcome the corrosion and oxidation damage of the solution coating on the alloy, significantly improve the capacity, high magnification performance and increase the cycle life of the alloy.(Lithium - Ion Battery Equipment)

In terms of research and development of A2B7 hydrogen storage alloy, scientific and technical personnel optimized the production process that can stably control the magnesium content and phase structure of A2B7 hydrogen storage alloy, so that the phase abundance of A2B7 phase in the alloy can reach more than 88%, and the deviation between the magnesium content in the alloy and the design value is not more than 5%. On this basis, A2B7 hydrogen storage alloy with super stacking structure, low cost, low self discharge and high capacity is further developed to produce high capacity nickel hydrogen battery. Through the research and development of this project, the production process and equipment suitable for this kind of alloy have been developed, and the industrialization of A2B7 hydrogen storage alloy has been realized; A2B7 hydrogen storage alloys with high rate and low self discharge performance have been developed respectively to further expand the application range of nickel metal hydride batteries.



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