Method for surface modification of AB3 type hydrogen storage alloy

Abstract

The invention discloses a method for surface modification of AB3 type hydrogen storage alloy. AB3 type parent body alloy is prepared through a vacuum induction melting method, after mechanical pulverization is carried out on alloy ingots, ball milling is conducted for 60-90 minutes at the rotating speed of 250-300 revolutions per minute, the allot ingots are divided into particle powder of 200-300 meshes in a sieved mode, and AB3 type alloy is prepared; the obtained AB3 type alloy and polyaniline are mixed according to the weight percentage, wherein the AB3 type alloy accounts for 96-99%, the polyaniline accounts for 1-4%, the sum of the weight percentage of the AB3 type alloy and the weight percentage of the polyaniline is 100%, ball milling is carried out for 10-30 minutes at the rotating speed of 100-200 revolutions per minute after mixing, and then the AB3 type hydrogen storage alloy undergoing surface modification is obtained. The surface modification is carried out on the AB3 type hydrogen storage alloy serving as power Ni / MH battery negative electrode materials through the method, and an alloy electrode with good cycling stability and excellent dynamics performance is obtained.

Description

technical field [0001] The invention belongs to the field of material chemistry and electrochemical research, in particular to polyaniline on AB 3 Type hydrogen storage alloy Mm 0.78 Mg 0.22 Ni 2.48 mn 0.09 Al 0.23 co 0.47 (Mm is mixed rare earth, the weight percentage of the composition is: 82.3% La and 17.7% Nd) The method of surface modification. Background technique [0002] The current commercial Ni / MH battery anode materials mainly use AB 5 type hydrogen storage alloy, but its specific capacity is close to the theoretical value, it is difficult to increase its capacity, and electric bicycles, electric vehicles and hybrid vehicles on the market require high specific capacity and high power, so it is urgent to develop new high Ni / MH battery anode material with higher capacity and higher power. AB 3 Type hydrogen storage alloys have a relatively high discharge capacity and have good application prospects, but their practical applications are limited due to their...

AI Technical Summary

Problems solved by technology

[0002]The current commercial Ni / MH battery anode material mainly uses AB5 type hydrogen storage alloy, but its specific capacity is close to the theoretical value, It is difficult to increase its capacity, and electric bicycles, electric vehicles, and hybrid vehicles on the market require high specific capacity and high power, so there is an urgent need to develop new high-capacity, higher-power Ni / MH battery anode materials

AB3 type hydrogen storage alloy has a relatively high discharge capacity and has a good application prospect, but its surface is easily oxidized, corroded, and poor in cycle stability, which limits its practical application.

At present, there are many studies on the surface modification of AB3 type hydrogen storage alloys, but there are relatively few studies on the modification of hydrogen storage alloys by polyaniline