Hydrogen storing alloy for rare earth capacitor battery and preparation method thereof

Abstract

The invention relates to a hydrogen storing alloy for a rare earth capacitor battery and a preparation method thereof, and belongs to the technical field of novel energy resource and efficient energy conservation. The alloy provided by the invention is prepared by adding nanoscale Co3O4 and nanoscale Ceo2 into rare earth metals and metals. The mass ratio of the nanoscale Co3O4 and nanoscale Ceo2 is 1:(1-2). The rare earth metals are La, Ce, Pr and Nd, while the metals are Ni, Co, Mn and Al. The preparation method comprises the following steps of: mixing the rare earth metals and metals, performing vacuum induction melting, cooling to obtain an alloy ingot and shelving for 10-30 days; adding the nanoscale Co3O4 and CeO2 for air crushing, compacting, and performing vacuum heat treatment; and air crushing and packaging to obtain a product. A metal oxide covers the surface of the particles of the hydrogen storing alloy as an efficient catalyst without surface treatment, so that the quality demand of a cathode battery material for the rare earth capacitor battery is met. In accordance with a primary preparation principle, constant temperature shelving and vacuum treatment are combined to uniformly distribute the components of the hydrogen storing alloy.

Description

technical field [0001] The invention relates to a hydrogen storage alloy for a rare earth capacitor battery and a preparation method thereof, belonging to the technical field of new energy and high efficiency and energy saving. Background technique [0002] Since the beginning of the 21st century, with the increasing energy crisis and environmental pollution, the call for energy conservation and emission reduction has become increasingly high. The stable growth of the world economy and the sustainable development of human society also urgently require the development of new energy sources and improved energy utilization methods. Pure electric buses equipped with rare-earth capacitor batteries have attracted widespread attention because of their high concentration, and their promotion and application have obvious advantages in environmental, economic and social benefits. [0003] The negative electrode of the rare earth capacitor battery adopts the matching combination of bat...

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Problems solved by technology

[0004] The current commercialized hydrogen storage alloy is AB 5 type, but AB 5 Type alloys usually require surface treatment such as acid and alkali before they can be applied to power batteries, such as nickel-metal hydride batteries for hybrid vehicles. The hydrogen storage alloys are usually treated with lye to make the surface rich in nickel, improve reactivity, and obtain Higher power growth, but this method has a large sewage treatment problem, and the process is cumbersome; some units also use the sintering process to obtain greater catalytic activity, but the sintered pole piece has large deformation, and the pole piece must be relatively thin, and The sintered pole piece is relatively brittle. While the mechanical strength increases, the flexibility decreases. However, the hydrogen storage alloy has a large expansion rate during the charging and discharging process. The sintered pole piece lacking flexibility is easy to pulverize, which reduces the service life of the battery.

Therefore, the area of ​​the sintered pole piece is relatively small, the specific energy of the battery mass is ≤50Wh / Kg, the capacity is ≤100Ah, and the lifespan is ≤500 times. The application field is also limited to fields that do not care about cost and special power requirements, such as laser equipment

In addition, there are scientific research units to add Co 3 o 4 AB 5 The research on the electrochemical performance of the alloy shows that the specific capacity has been improved to a certain extent, but the Co 3 o 4 Directly added to the alloy powder and used directly, there are poor dispersion and low adhesion, and its catalytic performance is difficult to exert. Therefore, the alloy powder still needs Venus surface treatment to improve its rate performance

[0005] "Adding Co" published by "Battery" 3 o 4 AB 5 Co 3 o 4 Directly added to the alloy powder and used directly, it has a certain effect on the specific capacity and catalytic performance of the alloy powder, but the catalytic performance is limited, and the adhesion is not strong and the dispersion is uneven

[0006] At present, there is a lack of hydrogen storage alloys for rare earth capacitor batteries that do not require subsequent surface treatment, can be used directly, and the pole pieces do not need to be sintered, and the prepared hydrogen storage alloy has the characteristics of high catalytic activity and long life.

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