A kind of preparation method of ultra-long-life Ni-MH battery electrode material

A nickel-metal hydride battery and electrode material technology, which is applied to the electrodes of primary batteries, alkaline battery electrodes, nickel batteries, etc., can solve problems such as the inability to fully meet the needs of the future power vehicle market, the high cost of replacing batteries, and the destruction of electrode structures. , to achieve the effect of inhibiting the formation of dendrites, improving the utilization rate, and increasing the bonding ability

Active Publication Date: 2020-10-16
XIFENG 2D FUJIAN MATERIAL TECH CO LTD
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  • Abstract
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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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  • A kind of preparation method of ultra-long-life Ni-MH battery electrode material
  • A kind of preparation method of ultra-long-life Ni-MH battery electrode material
  • A kind of preparation method of ultra-long-life Ni-MH 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 method for preparing an electrode material of an ultra-long-life nickel-hydrogen battery. The method comprises the following steps: firstly, removing the nickel oxide on the surface of the pore wall of the foamed nickel; and a nitrogen-containing protective layer; then a uniform electrode active material layer is formed on the surface of the carbon-containing or / and nitrogen-containing protective layer; finally, the electrode active material is filled into the nickel foam. The invention removes nickel oxide on the surface of nickel foam and forms a layer of carbon or nitrogen-containing protective layer on the surface. The protective layer is highly conductive and contains many dangling bonds and active hydroxyl groups on the surface, which can effectively increase the nickel foam and electrode The bonding ability of the active material can reduce the contact resistance; it can effectively inhibit the formation of dendrites and avoid the short circuit of the positive and negative electrodes caused by the puncture of the diaphragm; it can effectively cover the foamed nickel to prevent the foamed nickel from being corroded and consumed during the battery cycle, and maintain The integrity of the electrode structure improves the utilization of active materials, thereby prolonging the cycle life of the Ni-MH battery.

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 Patents(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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