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A method for improving electrochemical kinetics of la-mg-ni based alloy electrodes

An electrochemical and base alloy technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of decreased cycle stability, decreased electrochemical kinetic performance, and decreased overall electrochemical performance of Ni-MH batteries. Electrochemical impedance, the effect of improving electrochemical kinetic performance

Active Publication Date: 2018-07-27
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, some methods can improve the cycle stability of the material, but will lead to a decrease in the electrochemical kinetic performance of the material, and some methods can improve the electrochemical kinetic performance, but will lead to a decrease in the cycle stability
The two cannot be taken into account at the same time, resulting in limited development of Ni-MH batteries
Therefore, the incorporation of graphene or graphene-supported catalysts in Ni-MH batteries is expected to solve the problem of the decline in the comprehensive electrochemical performance of Ni-MH batteries.

Method used

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  • A method for improving electrochemical kinetics of la-mg-ni based alloy electrodes
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  • A method for improving electrochemical kinetics of la-mg-ni based alloy electrodes

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Embodiment 1

[0022] A method for improving the electrochemical kinetic performance of a La-Mg-Ni base alloy electrode, the preparation steps are as follows:

[0023] 1. Preparation of La-Mg-Ni based alloy

[0024] Under the protection of argon, the samples are configured according to the molar ratio of La:Mg:Ni:Co=7:3:29.75:5.25. All raw materials are block samples, and Mg is the master alloy MgNi 2 Instead, at the same time, in order to reduce the Mg element lost due to volatilization in the smelting process, an additional mass fraction of 20% MgNi 2 , deduction of MgNi 2 After adding Ni in the alloy, add elemental Ni to ensure that the ratio requirements are met, and then use the magnetic levitation induction melting method to melt the material. In order to ensure uniform smelting, the alloy ingot was repeatedly turned and smelted three times. Then part of the alloy is crushed and passed through a 250 mesh sieve, and then divided into three parts.

[0025] 2. Preparation of La-Mg-Ni-...

Embodiment 2

[0028] A method for improving the electrochemical kinetic performance of a La-Mg-Ni base alloy electrode, the preparation steps are as follows:

[0029] 1. La-Mg-Ni based alloy preparation:

[0030] Under the protection of argon, the samples are configured according to the molar ratio of La:Mg:Ni:Co=7:3:29.75:5.25. All raw materials are block samples, and Mg is the master alloy MgNi 2 Instead, at the same time, in order to reduce the Mg element lost due to volatilization in the smelting process, an additional mass fraction of 20% MgNi 2 , deduction of MgNi 2 After adding Ni in the alloy, add elemental Ni to ensure that the ratio requirements are met, and then use the magnetic levitation induction melting method to melt the material. In order to ensure uniform smelting, the alloy ingot was repeatedly turned and smelted three times. Then part of the alloy is crushed and passed through a 250 mesh sieve, and then divided into three parts.

[0031] 2. Preparation of La-Mg-Ni / gr...

Embodiment 3

[0034] A method for improving the electrochemical kinetic performance of a La-Mg-Ni base alloy electrode, the preparation steps are as follows:

[0035] 1. La-Mg-Ni based alloy preparation:

[0036] Under the protection of argon, the samples are configured according to the molar ratio of La:Mg:Ni:Co=7:3:29.75:5.25. All raw materials are block samples, and Mg is the master alloy MgNi 2 Instead, at the same time, in order to reduce the Mg element lost due to volatilization in the smelting process, an additional mass fraction of 20% MgNi 2 , deduction of MgNi 2 After adding Ni in the alloy, add elemental Ni to ensure that the ratio requirements are met, and then use the magnetic levitation induction melting method to melt the material. In order to ensure uniform smelting, the alloy ingot was repeatedly turned and smelted three times. Then part of the alloy is crushed and passed through a 250 mesh sieve, and then divided into three parts.

[0037] 2. The steps of the La-Mg-Ni / ...

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Abstract

The invention discloses a method for improving the electrochemical and dynamic properties of an La-Mg-Ni-based alloy electrode. The method comprises the steps of: smelting raw materials of La, Mg, Ni and Co into a cast alloy; crushing the cast alloy; and adding graphene and a graphene / nickel compound for mixing and ball-milling to prepare an La-Mg-Ni / graphene and La-Mg-Ni / graphene compound Ni-MH battery material. The method has the advantages that the electrochemical and dynamic properties of the material are obviously improved after the graphene and the graphene / nickel compound are added to La-Mg-Ni alloy powder for mixing and ball-milling; and a solid foundation is laid for later research of the Ni-MH battery material.

Description

technical field [0001] The invention belongs to the technical field of new battery materials, and specifically relates to a method for improving the electrochemical kinetic performance of a La-Mg-Ni-based alloy electrode. The method prepares a La-Mg-Ni with easy activation and good kinetic performance. Alloy-based electrode Ni-MH battery material. Background technique: [0002] Ni-MH batteries have attracted much attention due to their advantages such as high electrochemical capacity and good environmental compatibility, but how to improve the charging and discharging efficiency of Ni-MH batteries and provide charging and discharging performance still faces many problems. The use of element substitution, surface burden, heat treatment and other methods is one of the main means of research on the modification of Ni-MH battery materials, but these methods still have many disadvantages. For example, some methods can improve the cycle stability of the material, but will lead to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M10/30
CPCH01M4/364H01M4/385H01M10/30Y02E60/10
Inventor 蓝志强郭进魏冰周文政韦文楼
Owner GUANGXI UNIV
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