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A kind of cobalt-free hydrogen storage alloy electrode material and preparation method thereof

A hydrogen storage alloy and electrode material technology, which is applied to battery electrodes, alkaline storage battery electrodes, circuits, etc., can solve problems such as poor cycle stability, and achieve the effects of reduced hysteresis, simple operation, and high product purity

Active Publication Date: 2016-07-06
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: In order to overcome the deficiency of poor cycle stability of existing La-Mg-Ni alloy electrode materials, the present invention provides a cobalt-free hydrogen storage alloy electrode material and its preparation method

Method used

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  • A kind of cobalt-free hydrogen storage alloy electrode material and preparation method thereof
  • A kind of cobalt-free hydrogen storage alloy electrode material and preparation method thereof
  • A kind of cobalt-free hydrogen storage alloy electrode material and preparation method thereof

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Effect test

Embodiment 1

[0021] Embodiment 1: Alloy according to general formula La 4 MgNi 19 mn 0 The atomic ratio of the metal is weighed, and under the protection of argon, it is smelted into an alloy in a magnetic levitation vacuum induction furnace; the alloy is crushed and passed through a 300-mesh sieve, and the alloy powder that passes through the screen is taken; the screened alloy powder is mixed with hydroxyl The Ni powder is mixed uniformly at a mass ratio of 1:4; the mixture is cold-pressed under a pressure of 15MPa to form an electrode sheet of φ10mm×2mm. Its XRD phase diagram is as follows figure 1 shown, with Ce 5 co 19 and Pr 5 co 19 There are multiple identical diffraction peaks, indicating that this embodiment has the same 5 co 19 Type, Pr 5 co 19 similar crystal structures.

Embodiment 2

[0022] Embodiment 2: the general formula is La 3.99 Mg 0.01 Ni 18.5 mn 0.5 , the others are the same as in Example 1, and its XRD phase diagram is as figure 2 shown, with Ce 5 co 19 and Pr 5 co 19 There are multiple identical diffraction peaks, indicating that this embodiment has the same 5 co 19 Type, Pr 5 co 19 similar crystal structures.

Embodiment 3

[0023] Embodiment 3: the general formula is La 3.98 Mg 0.02 Ni 18 Mn, other are the same as embodiment 1, and its XRD phase diagram is as image 3 shown, with Ce 5 co 19 and Pr 5 co 19 There are multiple identical diffraction peaks, indicating that this embodiment has the same 5 co 19 Type, Pr 5 co 19 similar crystal structures.

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Abstract

The invention discloses a cobalt-free hydrogen storage alloy electrode material and a preparation method thereof. The general formula of the material is La4-xMgyNi19-zMnz, where 0≤x≤0.03, 0≤y≤1, 0≤z≤2, The preparation method of the material mainly includes the steps of batching, smelting, crushing, mixing, cold pressing and the like. A cobalt-free hydrogen storage alloy electrode material of the present invention has the characteristics of fast activation, high capacity, good high-current discharge performance, and low cost, and is suitable for use in high-capacity batteries; preparation of a cobalt-free hydrogen storage alloy electrode material of the present invention The method has the advantages of simple operation and high product purity.

Description

technical field [0001] The invention relates to a cobalt-free hydrogen storage alloy electrode material and a preparation method thereof, belonging to the technical field of hydrogen storage materials. Background technique [0002] Usually, the performance of the negative electrode hydrogen storage alloy material is a key factor affecting the performance of the nickel-metal hydride battery. The currently researched hydrogen storage alloy electrode materials mainly include AB5-type mixed rare earth alloys, AB2-type Laves phase alloys, Mg-based alloys, V-based solid solution alloys, and La-Mg-Ni alloys. AB5 type rare earth hydrogen storage alloy is widely used in the production of nickel-hydrogen battery anode materials because of its good comprehensive performance and low price. Its typical composition is MmNi 3.55 co 0.75 mn 0.4 Al 0.3 , due to the limitation of alloy crystal structure (CaCu5 type), its intrinsic hydrogen storage capacity is only 1.4wt%, and the discharg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/26H01M4/24
CPCY02E60/10
Inventor 魏范松魏范娜陆欢欢肖佳宁
Owner JIANGSU UNIV OF SCI & TECH