Nickel-hydrogen battery negative electrode hydrogen storage material capable of being used at low temperature and matched electrolytic solution thereof

A technology of hydrogen storage material and nickel-hydrogen battery, which is applied in the direction of nickel storage battery, alkaline storage battery electrode, alkaline storage battery, etc. Improve the effect of wide application temperature range and high low temperature electrochemical capacity

Inactive Publication Date: 2010-10-27
GUILIN UNIV OF ELECTRONIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its operating temperature is only in the range of -20-50°C, and the performance of the battery drops rapidly when it is below zero, and it cannot even discharge electricity at lower temperatures (as low as -30--40°C).
At present, in some special application fields: such as power supplies for some military electronic (communication) equipment, power supplies for electric vehicles in severe cold areas, electric tools for field operations, communication signal transfer stations, and batteries for soldiers' support, batteries are required to be able to It works normally in a lower temperature environment, but it is difficult for general Ni-MH batteries to discharge electricity in this environment, and the high-current discharge performance is even worse

Method used

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  • Nickel-hydrogen battery negative electrode hydrogen storage material capable of being used at low temperature and matched electrolytic solution thereof
  • Nickel-hydrogen battery negative electrode hydrogen storage material capable of being used at low temperature and matched electrolytic solution thereof
  • Nickel-hydrogen battery negative electrode hydrogen storage material capable of being used at low temperature and matched electrolytic solution thereof

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Experimental program
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Embodiment 1

[0016] The anode hydrogen storage material that can be used for low-temperature nickel-hydrogen batteries described in this embodiment has a general chemical formula of RE x Mg 1-x Ni yx m z , wherein, RE=La, M=Co, Mn, x=1, y=3.785, z=1.213, according to the chemical formula LaNi 3.785 co 1.07 mn 0.143 Calculate the composition weight ratio, the raw materials La, Ni, Co, Mn have a purity of 99%, and then melt them in an argon-protected induction melting furnace to obtain alloy samples, grind them into alloy powders of less than 200 mesh at room temperature (ie 25°C), and implement as above Methods The negative electrode sheet was prepared for the electrode activation test at room temperature. After the activation process was completed, it was lowered to the test temperature, and the hydrogen storage alloy was charged for 6 hours at a charging current density of 60mA / g in the environment of -35°C, 0°C, and 30°C. , after standing for 5 minutes, then discharge to the cut-off...

Embodiment 2

[0021] The negative electrode hydrogen storage material for the nickel-hydrogen battery described in this embodiment has a general chemical formula of RE x Mg 1-x Ni yx m z , RE=Ml (wherein Ml each part rare earth weight ratio is 80%La; 10%Ce; 10%Nd), M=Co, Mn; x=0.7, y=3.785, z=1.213, raw material is Ml, MgNi2 , Ni, Co, Mn, the master alloy Ml is first prepared by induction melting according to the atomic ratio 0.7 Ni 2.05 co 0.75 mn 0.1 , and then in an argon-protected induction melting furnace with Ml 0.7 Ni 2.05 co 0.75 mn 0.1 with MgNi 2 According to chemical formula Ml 0.7 Mg 0.3 Ni 2.65 co 0.75 mn 0.1 Calculate the composition weight ratio and smelt the alloy sample, grind it into alloy powder less than 200 mesh at room temperature (ie 25°C), prepare the negative electrode sheet according to the above implementation method, and conduct the electrode activation test at room temperature. After the activation process is completed, lower it to the test temper...

Embodiment 3

[0026] The electrolyte suitable for the negative electrode hydrogen storage material of the present invention is to add 0-6wt% LiOH and an appropriate amount of MnSO into a 6 mol / liter KOH solution 4 Make Mn 2+ Reaching saturation in the electrolyte, the role of LiOH is that Li can be adsorbed on Ni(OH) 2 The surface of the particles prevents the particles from growing and agglomerating, and improves the utilization rate of the electrode active material. At the same time, Li + It can also prevent electrode expansion, improve the reversibility of electrode reaction, strengthen the oxygen evolution polarization during electrode charging, prolong the service life of electrodes, etc.; saturate Mn 2+ The function is to inhibit the dissolution of the corresponding metal manganese in the negative electrode alloy, improve the utilization rate of the active material, and reduce the capacity loss. Place the electrode sheet prepared in Example 1 in the electrolyte of this example at ro...

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Abstract

The invention discloses a negative electrode hydrogen storage material for a nickel-hydrogen battery capable of being used at a low temperature, which comprises the atomic ratio ingredient composition shown as the following formula: RExMg<1-x>NiyxMz, wherein in the formula, x is greater than or equal to 0.7 and is smaller than or equal to 1, y is greater than or equal to 3.5 and is smaller than or equal to 3.9, z is greater than or equal to 1 and is smaller than or equal to 1.4, RE is one kind of materials or a mixture prepared from several kinds of materials at any mixture ratio in rare earth metals La, Ce, Pr or Nd, Ce-enriched mixed rare earth metal Mm, and La-enriched mixed rare earth metal Ml, and M is one kind of materials or a mixture of several kinds of materials at any mixture ratio in transition metal elements Co, Al, Mn, Fe, Cr and Ti. The discharging capacity during the application of the nickel-hydrogen battery negative electrode hydrogen storage alloy material of the invention under the low temperature (i.e. the temperature is ranged from 35 DEG C below zero to 0 DEG C) is much higher than the electrochemical discharging capacity of the existing products sold on markets, and the low-temperature performance is greatly improved. In addition, nickel-hydrogen battery products prepared from the negative electrode hydrogen storage material and the electrolytic solution of the invention have the characteristics of high low-temperature electrochemical capacity, obviously improved self discharging performance and high-speed discharging performance, wide application temperature range and the like, and can completely meet the requirement of normal use in low-temperature and normal-temperature environment.

Description

Technical field: [0001] The invention relates to a battery negative electrode hydrogen storage material, especially a low-temperature nickel-hydrogen battery negative electrode hydrogen storage material; the invention also relates to an electrolyte adapted to the low-temperature nickel-hydrogen battery negative electrode hydrogen storage material. Background technique: [0002] Low-temperature nickel-metal hydride batteries can be used in military, aerospace, navigation, petroleum, coal, geological exploration and operations, ice and mountaineering sports, Antarctic expeditions, etc., and can also meet the needs of secondary mobile power in the vast cold regions of the northern hemisphere need. The development of low-temperature Ni-MH batteries has good economic value and social significance, especially to meet the stringent requirements for Ni-MH batteries in some special fields. The nickel-metal hydride battery products under the existing technology, especially the curren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03C22C19/05H01M10/30H01M4/32
CPCY02E60/124Y02E60/10
Inventor 周怀营王仲民王培培倪成员周沁
Owner GUILIN UNIV OF ELECTRONIC TECH
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