Amorphous rear-earth-magnesium-Nickel series hydrogen storage electrode material and producing method thereof

An electrode material, amorphous technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of hindering the hydrogen absorption/desorption process, poor charge-discharge cycle stability, and rapid capacity decay, and achieve charge-discharge cycle stability. Good, improved efficiency, high initial electrochemical capacity effect

Inactive Publication Date: 2006-03-01
内蒙古希苑稀土功能材料工程技术研究中心 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main problem of magnesium-based hydrogen storage electrode materials is that the capacity decays quickly and the charge-discharge cycle stability is poor.
The reason for the capacity decay of magnesium-based hydrogen storage electrodes is generally believed to be: due to the chemical activity of magnesium, the electrode material forms Mg(OH) in alkaline electrolyte. 2 The passivation layer hinders the hydrogen absorption / discharge process, so the capacity decays; in addition, the dissolution of alloy elements in the electrolyte and the pulverization of the electrode during the hydrogen absorption / discharge process are also the reasons for the capacity fading

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Main raw materials: battery grade mixed rare earth metal Ml, metal magnesium Mg, Mg content ≥ 99.9, produced by Taiyuan Yiwei Magnesium Industry Group Co., Ltd. Analysis of pure nickel powder Ni, Ni content ≥ 99.9.

[0019] Ml 2 Mg 17 The smelting preparation of the alloy: Ml is a mixed rare earth metal with a La content of 64.3%, and the average atomic weight is 139.7. Calculated according to the stoichiometric ratio, Ml 2 Mg 17 The theoretical weight ratios of Ml and Mg are 40.3% and 59.7%, respectively. In order to ensure that the composition meets the stoichiometric ratio, the elemental magnesium with high vapor pressure at high temperature is excessively 0.2% during batching, and is smelted in a vacuum magnetic levitation furnace. Vacuum before smelting, then smelt Mm under argon protection 2 Mg 17 Hydrogen storage alloy, remelted three times. The alloy ingot is crushed into -500 mesh powder in petroleum ether after the oxide scale is removed.

[0020] An am...

Embodiment 2

[0023] Smelting to prepare Ml 2 Mg 17 The raw materials and smelting process of the alloy are the same as those in Example 1.

[0024] An amorphous rare earth-magnesium-nickel hydrogen storage electrode material was prepared by high-energy ball milling. The chemical formula of the hydrogen storage material is Ml 2 Mg 17 B(CFn) 0.2 +180wt.%Ni, according to the formula to calculate Ml 2 Mg 17 The weight ratio of , B, CFn and Ni is 100:1.5:0.9:1.8, and the grinding ball is mixed with Ml according to the ball-to-material ratio of 30:1. 2 Mg 17 The alloy powder, Ni powder, B powder and CFn powder are put into the ball mill tank, and the protective gas Ar gas is filled after vacuuming. The ball milling process was carried out in a QM-1SP planetary ball mill, the ball mill speed was 450 rpm, and the ball mill was continuously milled for 35 hours. The microstructure of the alloy was analyzed using a Philips-PW1700 X-ray diffractometer.

[0025] The preparation and testing met...

Embodiment 3

[0027] Smelting to prepare Ml 2 Mg 17 The raw materials and smelting process of the alloy are the same as those in Example 1.

[0028] An amorphous rare earth-magnesium-nickel hydrogen storage electrode material was prepared by high-energy ball milling. The chemical formula of the hydrogen storage material is Ml 2 Mg 17 BAl 0.3 +180wt.%Ni, according to the formula to calculate Ml 2 Mg 17 The weight ratio of , B, CFn and Ni is 100:1.5:1.2:1.8, and the grinding ball is mixed with Ml according to the ball-to-material ratio of 30:1. 2 Mg 17 The alloy powder, Ni powder, B powder and Al powder are put into the ball mill tank, and the protective gas Ar gas is filled after vacuuming. The ball milling process was carried out in a QM-1SP planetary ball mill, the speed of the ball mill was 450 rpm, and the material was continuously milled for 45 hours. The microstructure of the alloy was analyzed using a Philips-PW1700 X-ray diffractometer.

[0029] The preparation and testing m...

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PUM

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Abstract

A hydrogen storage electrode material of amorphous rare earth ¿C magnesium ¿C nickel series is prepared from chemical compositions of MI2 Mg17 BaAb + X wt..% Ni where A ¿C one or above one element of CFn , Si , S , C , P , AI , Ge , Se or I ; 0.01 íœ a íœ 3..o ; o íœ b íœ 2.5 ; X ¿C wt.. % content relative to MI2 Mg17 ; and 150 íœ x íœ 250 .

Description

technical field [0001] The invention relates to an amorphous rare earth-magnesium-nickel hydrogen storage electrode material and a preparation method thereof. Background technique [0002] LaNi 5 Type hydrogen storage alloy is the negative electrode material of nickel-hydrogen secondary battery (MH / Ni) widely used at present, its theoretical electrochemical capacity (limit capacity) is 373mAh / g, and the practical commercial negative electrode material Mm (NiCoMnAl) 5 (where Mm is a mixed rare earth metal), the maximum capacity is 310-320mAh / g. Compared with some high-energy secondary batteries (such as lithium-ion batteries), the mass specific energy of this type of battery has a large gap. In recent years, great attention has been paid to the research of magnesium-based alloys in order to develop high-performance hydrogen storage alloys for anode active materials in MH / Ni batteries. Magnesium-based hydrogen storage materials have high theore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/46C22C1/00
CPCY02E60/10
Inventor 熊玮闫慧忠孔繁清李宝犬
Owner 内蒙古希苑稀土功能材料工程技术研究中心
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