Amorphous magnesium-Nickel series hydron-storage electrode material and producing method thereof

An electrode material, amorphous technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of capacity attenuation, hindering the hydrogen absorption/desorption process, etc., and achieve the effect of improving production efficiency and good electrochemical cycle stability

Inactive Publication Date: 2006-03-01
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 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

[0017] According to the 1:1 stoichiometric ratio of the MgNi alloy, 1.28 grams of analytical pure Mg powder (purity 99.5%), 3.07 grams of analytical pure Ni powder (purity 99.5%), 0.08 grams of amorphous B powder, and 0.13 grams of fluorinated graphite (CFn) powder gram into a stainless steel ball mill jar with a ball-to-material ratio of 30:1, and filled with protective gas Ar after vacuuming. The ball milling process is carried out in a QM-1SP planetary ball mill, the speed of the ball mill is 450 rpm, and the material is discharged after continuous ball milling for 40 hours. The microstructure of the alloy is analyzed using a Philips-PW1700 X-ray diffractometer. The alloy powder is all amorphous . The preparation method of the test electrode is to mix 0.07 g of ball-milled alloy powder with 0.35 g of conductive agent carbonyl Ni powder (-200 mesh), and press it into a φ10 mm disc under a pressure of 40 tons / cm2 as the negative electrode. Cathode Ni(OH) 2 / NiOOH, the elect...

Embodiment 2

[0019] According to the 1:1 stoichiometric ratio of the MgNi alloy, 1.28 grams of analytical pure Mg powder (purity 99.5%), 3.07 grams of analytical pure Ni powder (purity 99.5%), 0.05 grams of amorphous B powder, 0.03 grams of Si powder, and fluorinated graphite 0.13 g of (CFn) powder was put into a stainless steel ball mill tank with a ball-to-material ratio of 30:1, and the protective gas Ar was filled after vacuuming. The ball milling process is carried out in a QM-1SP planetary ball mill with a speed of 450 rpm and continuous ball milling for 55 hours. The microstructure of the alloy is analyzed using a Philips-PW1700 X-ray diffractometer. The alloy powder is all amorphous . The preparation method of the test electrode and the battery assembly and testing methods are the same as in Example 1. The measured initial capacity is 480mAh / g, after 20 charge-discharge cycles, the capacity remains above 80%.

Embodiment 3

[0021] According to the 1:1 stoichiometric ratio of the MgNi alloy, 1.28 grams of analytical pure Mg powder (purity 99.5%), 3.07 grams of analytical pure Ni powder (purity 99.5%), 0.08 grams of amorphous B powder, 0.03 grams of Al powder, and fluorinated graphite 0.13 g of (CFn) powder was put into a stainless steel ball mill tank with a ball-to-material ratio of 30:1, and the protective gas Ar was filled after vacuuming. The ball milling process is carried out in a QM-1SP planetary ball mill, the ball mill speed is 450 rpm, and the material is discharged after continuous ball milling for 50 hours. The structure of the alloy is analyzed using a Philips-PW1700 X-ray diffractometer. The alloy powder is all amorphous . The preparation method of the test electrode and the battery assembly and testing methods are the same as in Example 1. The measured initial capacity is 435mAh / g, after 20 charge-discharge cycles, the capacity remains above 90%.

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Abstract

A hydrogen storage electrode alloy of amorphous magnesium ¿C nickel series is prepared from chemical compositions of MgNiBaAb + X wt.% ( CFn ) here A ¿C one or above one element of Si , S ,C ,P ,AI , Ge, Se or I ; CFN ¿C fluorographite ; 0.01 íœ a íœ 0.5 ; 0 íœ b íœ 0.4 ; x ¿C wt.% content relative to MgNiBaAb ; and 0.01 íœ x íœ 5.5 .

Description

technical field [0001] The invention relates to an amorphous magnesium-nickel hydrogen storage electrode material and a preparation method thereof. Background technique [0002] Hydrogen storage alloys are a class of functional materials with high hydrogen storage density discovered in the late 1960s, which can be roughly divided into five categories in terms of composition: rare earth series AB 5 type like LaNi 5 ; Magnesium series such as Mg 2 Ni, MgNi, La 2 Mg 17 ;Titanium-based AB type such as TiNi, TiFe; zirconium, titanium-based Laves phase AB 2 Type such as ZrNi 2 ; Vanadium series solid solution type such as (V 0.9 Ti 0.1 ) 1-x Fe x . [0003] LaNi 5 Type hydrogen storage alloy is the anode material of nickel-hydrogen secondary battery (MH / Ni) widely used at present, and its theoretical electrochemical capacity (limit capacity) is 373mAh / g, and the commercial anode material Mm (NiCoMnAl) of practical application 5 (Mm is a mi...

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 闫慧忠熊玮孔繁清李宝犬
Owner BAOTOU RES INST OF RARE EARTHS
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