AB5 type negative pole hydrogen-storage material

A hydrogen storage material and negative electrode technology, applied in battery electrodes, alkaline battery electrodes, electrical components, etc., can solve the problems of slow activation, poor cycle life, and other alloys have not reached practical application, and achieve good low-temperature charge-discharge performance, Wide applicable temperature range and improved electrochemical capacity

Inactive Publication Date: 2008-02-27
珠海金峰航电源科技有限公司
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Problems solved by technology

[0003] At present, for nickel-metal hydride batteries, the anode materials used are mainly mixed rare earth MmNi. 5 - type hydrogen storage alloy, the alloy capacity is generally about 300mAh, in order to improve the capacity of the negative electrode hydrogen storage alloy, Zr-based AB is currently being developed 2 type Laves phase alloy, Ti-Zr based AB type alloy and A 2 Type B Mg 2 Ni-magnesium-based alloys, but due to slow activation or poor cycle life, except for a small part of AB 2 Except for type alloys, other alloys have not reached practical application

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Embodiment Construction

[0035] The present invention will be further described below in combination with specific embodiments. However, it should be understood that the following embodiments are only used to illustrate the present invention rather than limit the scope of the present invention.

[0036] Alloy A according to Table 2 1 B 5 The weight percentage of each element is batched, and the prepared alloy raw material is vacuumized and passed into an induction furnace protected by argon for melting and ingot casting. After the cast hydrogen storage alloy is obtained, it is ground at room temperature into an alloy of less than 200 mesh powder for later use.

[0037] Table 2 embodiment of the present invention and the composition comparison (wt %) of prior art

[0038] Element

La

Ce

Pr

Nd

Ga

Ni

co

mn

Al

Book

MmNi 3.50 Ga 0.05 co 0.75 mn 0.4 al 0.3

21.80

7.60

0.99

2.64

0.82

48.58

10.45...

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Abstract

The invention provides a AB5 type negative hydrogen storage material. Wherein, the atom proportion is MmNi3.55-xGaxCo0.75Mn0.4Al0.3, in which the x ranges from 0-0.3, the Mm is rare-earth compound formed by La, Ce, Pr and Nd elements, the weight of rare-earth compound Mm is selected as standard, the weight of La is 64.5-67.5 %, the weight of Ce is 22.0-24.0 %, the weight of Pr is 2.5-3.5 % and the weight of Nd is 7.0-9.0 %. Since the Ga is imported, the electrochemical capacity of AB5 type negative hydrogen storage material in low temperature is improved markedly while it can be used in wide range of temperature. So the AB5 type negative hydrogen storage material can be used as negative electrode material to prepare nickel-hydrogen battery with better charging and discharging property in low temperature.

Description

technical field [0001] The invention relates to AB 5 Type battery anode hydrogen storage material. In particular, the present invention relates to ABs for nickel metal hydride batteries meeting low temperature performance requirements 5 negative electrode hydrogen storage materials. Background technique [0002] In recent years, due to the rapid development of cordless and rechargeable electric tools, people's work has brought great convenience, so the demand for secondary rechargeable batteries has also greatly increased. In the past, the rechargeable batteries used in power tools were mainly nickel-cadmium batteries, but nickel-cadmium batteries have low capacity and serious environmental pollution, so they are eliminated products. Ni-MH battery is the best substitute because of its excellent characteristics such as high capacity, long life, and no pollution, and its voltage is similar to that of Ni-Cd battery. Since the purpose of using electric tools is for convenien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/24H01M10/30
CPCY02E60/124Y02E60/10
Inventor 刘华福吴建民
Owner 珠海金峰航电源科技有限公司
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