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Fast charging type hydrogen storage alloy electrode material and preparing method thereof

A technology for hydrogen storage alloys and electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of increasing the internal resistance of batteries, weak oxidation resistance of alloy powder, and low capacity, so as to reduce the cost of raw materials and shorten the preparation time. , the effect of reducing energy consumption

Inactive Publication Date: 2007-05-09
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the AB 3 The fatal disadvantage of the alloy is that the alloy powder has weak oxidation resistance. The temperature rise caused by fast charging and the oxygen generated by the positive electrode will accelerate the oxidation of the alloy. If the alloy is smelted AB 3 Adding rare earth Y metal to the alloy can solve the oxidation problem, but the capacity is higher than that of AB 5 Type Alloy Low
If Y(OH) is added to the electrolyte 3 etc., although it does not reduce the capacity of the alloy body, but due to Y(OH) 3 Mg(OH) that is not firmly bonded on the surface of the alloy and is easily leached 2 The internal resistance of the battery is increased due to the partition of the colloid; this contradiction becomes a constraint on AB 3 One of the bottlenecks in the technological breakthrough of fast-charging MH-Ni batteries

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] According to chemical formula (ML 1-a-b-c-d Mg a R b Gd c my d ) Ni 3.1-e-f al e co f Proportion, R in the formula is specifically Zr, the value of a is 0.15, the value of b is 0.08, the value of c is 0.04, the value of d is 0.08, the value of e is 0.15, and the value of f is 0.1, the proportion of Mg-MY master alloy is 80wt%Mg-20wt%MY, in the vacuum electric arc furnace, put in ML, Zr, Gd, Ni, Al, Co metal, and smelt 3 times under the protection of Ar gas, Take out the alloy powder obtained by crushing, grinding, and passing through a 200-mesh sieve, and then mix it with Mg-MY master alloy powder. Under the protection of Ar gas, use a super-audio frequency induction furnace to control the alloy at 980 ° C ± 15 ° C for solid- The liquid diffuses for 0.5 hours, then heats up to 1080°C±80°C to distill excess Mg, the alloy is cooled, crushed, sampled and analyzed, and ground into alloy powder below 200 mesh, mixed with carbonyl Ni powder at a mass ratio of 1:6, and ...

Embodiment 2

[0014] All the other are with embodiment 1. R is Ti, the value of a is 0.24, the value of b is 0.08, the value of c is 0.03, the value of d is 0.04, the value of e is 0.15, and the value of f is 0.1. Ultrasound frequency induction heating, the temperature of solid-liquid diffusion is controlled at 750°C±15°C, and the diffusion time is 3 hours; the obtained performance indexes are listed in Tables 2-4 respectively.

Embodiment 3

[0016] All the other are with embodiment 1. R is Zr, the value of a is 0.12, the value of b is 0.07, the value of c is 0.05, the value of d is 0.06, the value of e is 0.08, and the value of f is 0.15. Ultrasound frequency induction heating, the temperature of solid-liquid diffusion is controlled at 800°C±15°C, and the diffusion time is 1.5 hours. The obtained performance indicators are listed in Table 2-4 respectively.

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Abstract

This invention relates to a quick charged MH-Ni battery negative alloy material and its preparation method, which solves the technological problem of quick charging or heavy oxidation in high temperature storage for AB3 series H-stored alloy by taking ML, MY metals, Ni, Al,, Co, Mg, Zr, Ti and Gd metals as the raw materials to compose AD3.1 type non-chemical measurement ratio H-stored alloy and using the methods of graded melting, solid-liquid diffusion and high temperature distillation to obtain quick charge oxidation resistant H-stored alloy electrode material suitable for the quick charged MH-Ni batteries.

Description

Technical field: [0001] The invention relates to a fast-charging nickel-metal hydride battery negative electrode alloy material and a preparation method thereof. Background technique: [0002] Currently, the market has a strong demand for fast-charging MH-Ni batteries that can be charged within 15 minutes. The battery not only needs a dedicated fast charger, but also requires materials such as battery positive and negative electrodes and separators to meet the needs of fast charging. Since the charging reaction of the MH-Ni battery is an exothermic reaction, the Joule heat generated by the fast charging causes the battery to heat up rapidly, which causes severe oxidation of the hydrogen storage alloy and the diaphragm in the negative electrode. Controlling the temperature rise of battery charging and solving the problem of high-temperature oxidation of hydrogen storage alloys are one of the key technologies that must be solved for fast-charging MH-Ni batteries. So far, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38C22C1/00C22C19/00
CPCY02E60/10
Inventor 吴耀明刘宝忠王立民
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI