2H type A5B19 superstacked La-M-Mg-Ni based quaternary hydrogen storage alloy electrode material and preparation method thereof

A technology of A5B19 and hydrogen storage alloys, which is applied in battery electrodes, structural parts, nickel storage batteries, etc., can solve the problems that the preparation method of quaternary hydrogen storage alloys has not been reported, the difficulty of quaternary single-phase alloys increases, and the phase transition reaction is complicated. , to achieve excellent high-rate discharge performance, excellent electrochemical cycle stability, and reduce thermal uneven deformation

Active Publication Date: 2018-09-04
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Pr 5 co 19 The formation conditions of quaternary single-phase alloys are relatively harsh, and the phase transition reaction of the alloy becomes more complicated after doping with multiple elements, so the difficulty of synthesizing quaternary single-phase alloys is greatly increased.
At present, regarding multi-element doped pure phase 2H type A 5 B 19 The preparation method of superstacked La–M–Mg–Ni-based quaternary hydrogen storage alloys has not been reported

Method used

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  • 2H type A5B19 superstacked La-M-Mg-Ni based quaternary hydrogen storage alloy electrode material and preparation method thereof
  • 2H type A5B19 superstacked La-M-Mg-Ni based quaternary hydrogen storage alloy electrode material and preparation method thereof
  • 2H type A5B19 superstacked La-M-Mg-Ni based quaternary hydrogen storage alloy electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Ingredients

[0036] La obtained by induction melting 0.65 PR 0.15 Mg 0.2 Ni 3.65 and LaMgNi 4 Alloy ingots were used as precursors, and were pulverized to 300 mesh under argon atmosphere, according to the molar ratio La 0.65 PR 0.15 Mg 0.2 Ni 3.65 : LaMgNi 4 =0.9:1 (ie: 1.058g of La 0.65 PR 0.15 Mg 0.2 Ni 3.65 and 1.442 g of LaMgNi 4 Alloy powder) is mixed evenly;

[0037] (2) ball mill

[0038] The mixture in step (1) was ball-milled for 1 h under an argon atmosphere, the ball-to-material ratio was 30:1, and the rotational speed was 100 r / min. The ball-milling procedure was ball milling for 20 minutes with an interval of 20 minutes; b1;

[0039] (3) Tablet

[0040] The mixture of step (2) is cold-pressed and formed under a pressure of 10MPa, and wrapped and welded and sealed with a nickel plate;

[0041] (4) Sintering

[0042] The pressed sheet of step (3) is placed in the vacuum sintering furnace and sealed, and the vacuum degree is 5 × 10 -3 ...

Embodiment 2

[0053] (1) Ingredients

[0054] La obtained by induction melting 0.65 Nd 0.15 Mg 0.2 Ni 3.65 and LaMgNi 4 Alloy ingots were used as precursors, and were pulverized to 400 mesh under argon atmosphere, according to the molar ratio La 0.65 Nd 0.15 Mg 0.2 Ni 3.65 : LaMgNi 4 =0.74:1 (ie: 0.95g of La 0.65 Nd 0.15 Mg 0.2 Ni 3.65 and 1.55 g of LaMgNi 4 Alloy powder) is mixed evenly;

[0055] (2) ball mill

[0056] The mixture in step (1) was ball-milled for 0.5 h under an argon atmosphere, the ball-to-material ratio was 30:1, the rotational speed was 100 r / min, the ball-milling program was ball-milling for 20 minutes, and an interval of 20 minutes; after the ball-milling was completed, it was naturally cooled to room temperature and taken out;

[0057] (3) Tablet

[0058] The mixture of step (2) is cold-pressed and formed under a pressure of 10MPa, and wrapped and welded and sealed with a nickel plate;

[0059] (4) Sintering

[0060] The pressed sheet of step (2) is ...

Embodiment 3

[0071] (1) Ingredients

[0072] La obtained by induction melting 0.65 Gd 0.15 Mg 0.2 Ni 3.65 and LaMgNi 4 Alloy ingots were used as precursors, and were pulverized to 350 mesh under argon atmosphere, according to the molar ratio La 0.65Gd 0.15 Mg 0.2 Ni 3.65 : LaMgNi 4 =0.625:1 (ie: 0.85g of La 0.65 Gd 0.15 Mg 0.2 Ni 3.65 and 1.65 g of LaMgNi 4 Alloy powder) is mixed evenly;

[0073] (2) ball mill

[0074] The mixture in step (1) was ball-milled for 0.8 h under an argon atmosphere, the ball-to-material ratio was 30:1, and the rotation speed was 100 r / min. The ball-milling procedure was ball milling for 20 minutes with an interval of 20 minutes; after the ball milling was completed, it was naturally cooled to room temperature and taken out;

[0075] (3) Tablet

[0076] The mixture of step (2) is cold-pressed and formed under a pressure of 10MPa, and wrapped and welded and sealed with a nickel plate;

[0077] (4) Sintering

[0078] Place the pressed tablet of s...

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Abstract

The invention relates to a 2H type A5B19 superstacked La-M-Mg-Ni based quaternary hydrogen storage alloy electrode material. The material has a chemical composition of LaxMyMgzNir, wherein x, y, z andr are atomic ratios, and x is greater than or equal to 0.6 and smaller than or equal to 0.7, y is greater than or equal to 0.1 and smaller than or equal to 0.2, z is greater than or equal to 0.1 andsmaller than or equal to 0.20, r is greater than or equal to 3.70 and smaller than or equal to 3.85, and M is one of the rare earth elements Pr, Nd, Sm or Gd. The preparation method of the quaternaryhydrogen storage alloy electrode material mainly consists of compounding, ball milling, tabletting and sintering, and sintering is divided into two temperature rise periods and two cooling periods. The preparation method is simple, the process is easy to control, the prepared material has a stable structure and few defects, the alloy composition is uniform, the crystal structure is complete, the grain size is uniform, the alloy electrode material has excellent electrochemical cyclic stability and high rate discharge performance, the HRD1500 (high rate discharge performance under a discharge current density of 1500mA / g) is up to 65%, and the capacity retention rate can be as high as 90% after 100 charge / discharge cycles.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a hydrogen storage alloy electrode material and a preparation method thereof. Background technique [0002] Ni-MH battery is a high-energy green rechargeable battery with high energy density, fast charging and discharging, and long cycle life. It has always occupied a large share of the hybrid vehicle battery market. In order to adapt to the development trend of high-capacity and high-power Ni-MH batteries, it is urgent to research and develop Ni-MH battery anode materials with high capacity, high cycle stability and excellent high-rate discharge performance. And the current commodity type AB 5 Type hydrogen storage alloys have low discharge capacity and poor high-rate discharge performance, making it difficult to meet the development needs of high-capacity and high-power power batteries. [0003] In recent years, a new class of La–Mg–Ni-based hydrogen ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M10/30C22C1/04C22C19/03
CPCC22C1/0433C22C19/03H01M4/383H01M10/30Y02E60/10
Inventor 韩树民赵雨萌张璐
Owner YANSHAN UNIV
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