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Hydrogen storage alloy containing gadolinium and nickel, negative electrode, battery and preparation method

A technology of hydrogen storage alloy and negative electrode, applied in nickel storage battery, negative electrode, battery electrode, etc., can solve the problems of poor battery self-discharge characteristics and low maximum discharge capacity.

Active Publication Date: 2021-09-14
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The battery self-discharge characteristics of the hydrogen storage alloy are not good, and the maximum discharge capacity is low

Method used

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  • Hydrogen storage alloy containing gadolinium and nickel, negative electrode, battery and preparation method

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preparation example Construction

[0050] The hydrogen storage alloy of the present invention can be prepared by various methods, such as mechanical alloying method, powder sintering method, high temperature smelting-gas atomization method, reduction diffusion method, replacement diffusion method, combustion synthesis method, self-propagating high temperature synthesis method, High-temperature melting casting method, high-temperature melting-rapid quenching method and chemical method. Specifically, the preparation method of the hydrogen storage alloy of the present invention includes: (1) melting step; (2) preparation step of alloy sheet or alloy ingot; and (3) heat treatment step.

[0051] In step (1), the composition satisfying the formula RE x Gd y L z Ni d-a-b-c mn a Al b m c The raw materials are placed in a smelting furnace for smelting to obtain a smelted product. In the present invention, the smelting furnace is first cleaned with an inert gas. Furnace washing is to fill the melting furnace with...

Embodiment 1

[0067] According to the formula of table 1, prepare the hydrogen storage alloy containing gadolinium and nickel as follows:

[0068] (1) Place each raw material in the melting furnace in turn from the bottom to the upper part of the melting furnace, among which the rare earth metal raw materials are placed in the upper part; then vacuumize the melting furnace to an absolute vacuum degree ≤ 5Pa, and fill it with argon to a relative vacuum The temperature is -0.055MPa; then the smelting furnace is heated to 1400°C, and after the metal raw material in the smelting furnace is completely melted, it is kept for 3 minutes, and the heating is stopped to obtain the smelted product.

[0069] (2) Cast the smelted product to a cooling copper roll, and quickly quench and spin it to form an alloy sheet with a thickness of 0.3mm.

[0070] (3) The alloy sheet was placed in a heat treatment furnace filled with argon with a relative vacuum degree of -0.025 MPa, and heat treated at 850° C. for 1...

Embodiment 2 and 3

[0072] According to the formula in Table 1, the hydrogen storage alloy containing gadolinium and nickel was prepared according to the method of Example 1.

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Abstract

The invention discloses a hydrogen storage alloy containing gadolinium and nickel, a negative electrode, a battery and a preparation method. The hydrogen storage alloy is composed of RE x Gd y L z Ni d‑a‑b‑c Mn a Al b M c ; RE is selected from one or more of rare earth metal elements other than Gd, Y and Sm; L is selected from one or both of Y and Sm rare earth metal elements; M is selected from Cu, Fe, Co, Sn One or more of , V, W, Cr, Zn, Mo and Si elements; wherein, x>0, y≥0.01, y≥z>0, and x+y+z=6; 26>d≥ 15.6; 4.5≥a+b>0; 2.5>c≥0. The invention improves the maximum discharge capacity of the hydrogen storage alloy.

Description

technical field [0001] The invention relates to a hydrogen storage alloy containing gadolinium and nickel, a negative electrode, a battery and a preparation method. Background technique [0002] Hydrogen storage alloys are a class of functional materials with high hydrogen storage density discovered in the late 1960s. Among a series of hydrogen storage alloys that have been developed, rare earth hydrogen storage alloys have excellent kinetic and electrochemical properties, and are usually used as anode materials for nickel-metal hydride (MH-Ni) secondary batteries. [0003] The theoretical electrochemical capacity of rare earth hydrogen storage alloys is high, especially the rare earth nickel-based AB 3 Type, A 2 B 7 Type, A 5 B 19 The research on the type hydrogen storage alloy has made important progress, and has entered the stage of industrial application, becoming a research and development hotspot. [0004] CN1072268C discloses a kind of hydrogen storage alloy, ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/03C22C1/02C22F1/10C22F1/02H01M4/38H01M10/30
CPCC22C1/023C22C19/007C22C19/03C22C2202/04C22F1/02C22F1/10H01M4/383H01M10/30H01M2004/027Y02E60/10
Inventor 张旭赵玉园郑天仓徐津周淑娟闫慧忠王利李宝犬李金熊玮
Owner BAOTOU RES INST OF RARE EARTHS
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