Preparation method of ultra-long lifetime nickel-hydrogen battery electrode material

A nickel-metal hydride battery and electrode material technology, which is applied in the direction of primary battery electrodes, alkaline storage battery electrodes, electrode manufacturing, etc., can solve problems such as inability to fully meet the needs of the future power vehicle market, high and low replacement battery costs, and electrode structure damage. , to achieve the effects of inhibiting the formation of dendrites, improving the utilization rate, and increasing the bonding ability

Active Publication Date: 2018-03-06
XIFENG 2D FUJIAN MATERIAL TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention provides a preparation method of an ultra-long-life Ni-MH battery electrode material, which solves the problem that the traditional Ni-MH battery will pierce the diaphragm due to the generation of dendrites and cause a short circuit between the positive and negative electrodes, and the nickel foam will be corroded and consumed. The electrode structure is damaged and other reasons, which lead to the problem of short cycle life; the purpose of the present invention is also to provide an ultra-long-life Ni-MH battery, which solves the problem of high replacement battery costs for hybrid vehicles caused by the short cycle life of traditional Ni-MH batteries Its market advantages, and the inability to fully meet the market demand for future power vehicles

Method used

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  • Preparation method of ultra-long lifetime nickel-hydrogen battery electrode material
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  • Preparation method of ultra-long lifetime nickel-hydrogen battery electrode material

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preparation example Construction

[0023] The invention provides a method for preparing an electrode material for an ultra-long-life nickel-metal hydride battery, the method comprising the following steps:

[0024] S01, remove the nickel oxide on the surface of the foamed nickel pore wall, adopt at least one of hydrogen reduction or acid treatment methods, the foamed nickel is the conductive skeleton of the positive electrode or / and negative electrode material, and its surface density is 200-400g / m2, porosity ≥95%, the thickness is 1-3mm;

[0025] S02, grow a layer of carbon-containing or / and nitrogen-containing protective layer on the surface of the nickel foam cell wall, the preparation method adopted is chemical vapor deposition (CVD), physical vapor deposition (PVD), atomic layer deposition (ALD), and water At least one of the thermochemical reaction methods, the carbon or / and nitrogen-containing protective layer is highly conductive, the surface contains many dangling bonds and active hydroxyl groups, effe...

Embodiment 1

[0030] First, the nickel oxide layer on the surface of the nickel foam cell wall was removed by hydrogen reduction, and then a carbon / nitrogen-containing protective layer with a thickness of about 500 nm was formed on the surface of the nickel foam by atomic layer deposition (ALD). Electroless deposition method immerses positive electrode active material Ni(OH) 2 solution, forming a uniform layer of Ni(OH) on its surface 2 layer, and finally the active material Ni(OH) 2 Fill the pores of nickel foam and roll to form the positive electrode of nickel-metal hydride batteries. The negative electrode of Ni-MH battery adopts conventional steel mesh, or copper mesh + metal hydride (LaNi 5 h 6 ) made, and finally assembled into a nickel metal hydride battery.

[0031] The nickel-metal hydride battery is charged and discharged at 1C, and its discharge capacity is about 1500mAh. After 400 cycles, it still maintains a capacity of about 950mAh, and the capacity still maintains about 6...

Embodiment 2

[0033] The nickel oxide layer on the surface of the foamed nickel pore wall is removed by acid treatment, and a carbon / nitrogen-containing protective layer with a thickness of about 100nm is formed on the foamed nickel surface by chemical vapor deposition (CVD), and then electrochemical deposition is used. The method is to immerse the positive electrode active material Ni(OH) 2 solution, forming a uniform layer of Ni(OH) on its surface 2 layer, and finally the active material Ni(OH) 2 Fill the pores of nickel foam and roll to form the positive electrode of nickel-metal hydride batteries. The negative electrode of Ni-MH battery adopts conventional steel mesh, or copper mesh + metal hydride (LaNi 5 h 6 ) made, and finally assembled into a nickel metal hydride battery.

[0034] The nickel-metal hydride battery is charged and discharged at 1C, and its discharge capacity is about 1500mAh. After 400 cycles, it still maintains a capacity of about 950mAh, and the capacity still ma...

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Abstract

The invention discloses a preparation method of an ultra-long lifetime nickel-hydrogen battery electrode material. The method comprises the following steps of firstly, removing nickel oxide on a foamed nickel hole wall surface; secondly, growing a carbon-containing or / and nitrogen-containing protection layer on the foamed nickel hole wall surface; thirdly, forming a uniform electrode active substance layer on a surface of the carbon-containing or / and nitrogen-containing protection layer; and finally, filling foamed nickel with the electrode active substance. The nickel oxide on the surface ofthe foamed nickel is removed, the carbon-containing or / and nitrogen-containing protection layer is formed in the surface of the foamed nickel, the protection layer is high in electrical conductivity,many suspension bonds and active hydroxyl groups are contained in the surface of the protection layer, the bonding capability of the foamed nickel and the electrode active substance can be effectivelyimproved, the contact resistance is reduced, dendrite growing can be effectively prevented, a diaphragm is prevented from being punctured to cause short circuit of a positive electrode and a negativeelectrode, the foamed nickel can be effectively coated and is prevented from being corroded and consumed during the circulation process of a battery, the completeness of a battery structure is maintained, the active substance utilization ratio is improved, so that the cycle lifetime of the nickel-hydrogen battery is prolonged.

Description

technical field [0001] The invention relates to the field of preparation of nickel-hydrogen batteries and electrode materials thereof, in particular to a preparation method of ultra-long-life nickel-hydrogen battery electrode materials. Background technique [0002] With the increasing air pollution in cities, the research and development of batteries for electric vehicles has received more and more attention. Ni-MH batteries have the advantages of high capacity, high power, and no pollution. Compared with Ni-Cd batteries, the capacity of Ni-MH batteries is increased by more than 50%, which eliminates the pollution of metals to the environment and can realize fast charging. A very important development direction. At the same time, nickel-metal hydride batteries have excellent performance of low cost and high power, and are currently the only battery system that has been actually verified and commercialized and scaled up in the battery system used in hybrid electric vehicles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/26H01M4/32H01M10/34
CPCH01M4/26H01M4/32H01M10/345H01G9/035H01G9/042H01M4/04H01M4/08H01M10/30Y02E60/10
Inventor 许志
Owner XIFENG 2D FUJIAN MATERIAL TECH CO LTD
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