A2B7 type hydrogen storage alloy containing zirconium or titanium, negative electrode, battery and preparation method

A technology for hydrogen storage alloys and negative electrodes, which is applied in the direction of nickel storage batteries, battery electrodes, alkaline storage batteries, etc., can solve the problems of low L content of hydrogen storage alloys, improve service life, improve self-discharge characteristics and high-temperature discharge capabilities, and improve The effect of activation performance

Active Publication Date: 2021-07-13
BAOTOU RES INST OF RARE EARTHS
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The L content of the above-mentioned hydrogen storage alloy is relatively low, resulting in a maximum battery capacity of only 320mAh / g

Method used

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  • A2B7 type hydrogen storage alloy containing zirconium or titanium, negative electrode, battery and preparation method

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preparation example Construction

[0094] Preferably, the method for preparing the hydrogen storage alloy of the present invention includes: a melting step; an alloy flake or alloy ingot forming step; and a heat treatment step. A detailed description is given below.

[0095] will be composed to satisfy the RE x Gd y Ni z-a-b-c mn a al b m c Zr d Ti e The metal raw materials are placed in a vacuum environment for smelting to obtain smelted products. Wherein, each element and its mole fraction are as described above, and will not be repeated here. The relative vacuum degree of the vacuum environment is -0.01~-0.1MPa; preferably -0.02~-0.08MPa; more preferably -0.03~-0.06MPa. The melting temperature is 1200-1600°C, preferably 1300-1500°C, more preferably 1300-1400°C. Stop heating after the metal raw material in the furnace is completely melted, it takes about 10-60 minutes. Such smelting conditions are conducive to prolonging the service life, increasing the maximum discharge capacity and reducing self-...

Embodiment 1

[0110] According to the formula in Table 1, prepare A according to the following steps 2 B 7 Type hydrogen storage alloy:

[0111] (1) Place the metal raw materials Ni, Mn, Al, Zr, Ti, La, Gd in the vacuum melting furnace from the bottom to the top in sequence, and then vacuumize the vacuum melting furnace to an absolute vacuum degree ≤ 5Pa, Fill with argon to a relative vacuum of -0.055MPa. The vacuum melting furnace is heated to 1400°C, and the metal raw material in the furnace is completely melted into a smelted product, and then the heat is kept for 3 minutes, and then the heating is stopped.

[0112] (2) Cast the smelted product onto a cooling copper roll, and quickly quench and spin it into an alloy sheet with a thickness of 0.3mm.

[0113] (3) Place the alloy sheet in a device filled with argon with a relative vacuum of -0.025MPa, heat treatment at 875°C for 16h, and obtain A 2 B 7 type hydrogen storage alloy.

Embodiment 2、3 and 8

[0115] According to the formula of table 1, prepare A according to the method for embodiment 1 2 B 7 type hydrogen storage alloy.

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Abstract

The invention discloses a zirconium or titanium A 2 B 7 Type hydrogen storage alloy, negative electrode, battery and preparation method. The composition of the hydrogen storage alloy is RE x Gd y Ni z‑a‑b‑c mn a Al b m c Zr d Ti e ; Wherein, RE is selected from one or more of La, Ce, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y and Sc elements; wherein, M is selected One or more of Cu, Fe, Co, Sn, V, W, Cr, Zn, Mo and Si elements; where, x, y, z, a, b, c, d and e represent the elements of each element Mole fraction; wherein, x>0, y≥0.6, and y+x=6; 22>z≥19; 7≥a+b>0; 6≥c≥0; 4≥d+e>0. The hydrogen storage alloy of the invention has better activation performance, electrochemical performance and service life.

Description

technical field [0001] The present invention relates to a kind of containing zirconium or titanium A 2 B 7 Type hydrogen storage alloy, negative electrode, battery and preparation method. Background technique [0002] Hydrogen storage alloys are a class of materials that can reversibly absorb and release hydrogen, and are widely used as components of anode materials for nickel-metal hydride (MH-Ni) secondary batteries. Among hydrogen storage alloys, rare earth hydrogen storage alloys have excellent kinetic and electrochemical properties, and have become the focus of research and development of nickel-metal hydride secondary batteries. [0003] With the rapid growth of demand for nickel-metal hydride secondary batteries for new energy vehicles, smart grid energy storage, and communication base station reserve power, the global market demand for hydrogen storage alloys will also increase rapidly, and the comprehensive performance of rare earth hydrogen storage materials has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/03C22C1/02C22F1/10C22F1/02H01M4/38H01M4/24H01M10/30
CPCC22C1/023C22C19/007C22C19/03C22F1/02C22F1/10H01M4/242H01M4/383H01M10/30Y02E60/10
Inventor 王利李宝犬徐津赵玉园周淑娟李金熊玮闫慧忠郑天仓张旭
Owner BAOTOU RES INST OF RARE EARTHS
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