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A nickel hydrogen cathode material and its making method

A negative electrode material and technology for nickel-hydrogen batteries, applied in the field of nickel-hydrogen battery negative electrode materials and its preparation, nickel-hydrogen battery negative electrode materials containing nanocrystalline nickel powder and its preparation, can solve the problem of charging without considering the influence of nickel powder electrocatalytic activity There is no contribution to the capacity, etc., to improve the electrocatalytic performance, improve the charge and discharge efficiency, and increase the discharge capacity.

Inactive Publication Date: 2011-03-16
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of them considered the effect of the added nickel powder on the electrocatalytic activity of the anode material for hydrogen. The nickel powder used only played the role of a conductive agent or a current collector, and had little effect on improving the charging efficiency and charging capacity of the anode material. contribute

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1), the preparation of nanocrystalline nickel powder: put the commercially available non-nanocrystalline nickel powder into a stainless steel ball milling tank, adopt stainless steel ball milling medium, the rotating speed is 300 rpm, and the ball-to-material ratio is 20:1, under argon protection Running down and ball milling for 50 hours, the nanocrystalline nickel powder with a purity of 99.2%, an average particle size of 10 μm and an average grain size of 9 nm was obtained. The particle shape is spherical.

[0020] 2), preparation of negative electrode material: mix nanocrystalline nickel powder and commercially available MmNi with the ratio of weight ratio 2:1 3.8 co 0.75 mn 0.4 Al 0.2 The rare earth-based hydrogen storage alloy was mixed (Ningbo Shenjiang Technology Co., Ltd.), and cold-pressed into a thin sheet with a diameter of 18 mm and a thickness of about 1 mm under a pressure of 20 MPa. Using the same conditions, non-nanocrystalline nickel powder and hyd...

Embodiment 2

[0023] 1), the preparation of nanocrystalline nickel powder: put the commercially available non-nanocrystalline nickel powder into a stainless steel ball milling tank, adopt stainless steel ball milling medium, the rotating speed is 400 rpm, and the ball-to-material ratio is 10:1, in argon gas Run under protection and ball mill for 5 hours to obtain nanocrystalline nickel powder with a purity of 99.7%, an average particle size of 55 μm, and an average grain size of 26 nm. The particle shape is irregular.

[0024] 2), negative electrode material preparation: nanocrystalline nickel powder and commercially available MmNi 3.8 co 0.75 mn 0.4 Al 0.2 The rare earth-based hydrogen storage alloy was mixed evenly, and cold-pressed under a pressure of 20 MPa to form a thin sheet with a diameter of 18 mm and a thickness of about 1 mm. Using the same conditions, non-nanocrystalline nickel powder and hydrogen storage alloy were prepared as anode materials for comparison.

[0025] 3) Th...

Embodiment 3

[0027] 1), the preparation of nanocrystalline nickel powder: put the commercially available non-nanocrystalline nickel powder into a stainless steel ball milling tank, adopt stainless steel ball milling medium, the rotating speed is 400 rpm, and the ball-to-material ratio is 10:1, in argon gas Run under protection and ball mill for 5 hours to obtain nanocrystalline nickel powder with a purity of 99.7%, an average particle size of 55 μm, and an average grain size of 26 nm. The particle shape is irregular.

[0028] 2) Preparation of negative electrode material: mix nanocrystalline nickel powder with TiNi titanium-based hydrogen storage alloy made by mechanical ball milling method and polyvinyl alcohol with a weight ratio of 4% relative to the hydrogen storage alloy with a weight ratio of 1:3, It was cold-pressed under 20 MPa pressure to form a sheet with a diameter of 18 mm and a thickness of about 1 mm. Using the same conditions, non-nanocrystalline nickel powder and hydrogen ...

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Abstract

The present invention provides a H / Ni battery negative electrode material containing nano-crystalline nickel powder and its preparing method. The negative electrode material in MH / Ni battery is characterized in that the raw materials are hydrogen storage alloy and nano-crystalline nickel powder, the mass ratio of nano-crystalline nickel powder to hydrogen storage alloy is 3:1-1:5, negative electrode material is obtained by cold pressing preparation. The H / Ni battery negative electrode material of the preparation is added with nano-crystalline nickel powder, capable of improving charge-discharge efficiency of the hydrogen storage alloy, reducing charge platform, enhancing discharge platform, enhancing discharge capacity of the hydrogen storage alloy. In the charge-discharge cycle process, the active surface of the hydrogen storage alloy is enhanced, the electro-catalytic performance of the hydrogen storage alloy to the hydrogen is improved.

Description

technical field [0001] The invention belongs to the field of energy, and relates to a nickel-hydrogen battery negative electrode material and a preparation method thereof; in particular, it relates to a nickel-hydrogen battery negative electrode material containing nanocrystalline nickel powder and a preparation method thereof. Background technique [0002] Ni-MH secondary batteries have many advantages such as high energy density, high charge and discharge capacity, long life, good safety and environmental protection [1-2]. Higher requirements are placed on the electrochemical performance of the battery. The hydrogen storage alloy, which is the main component of the negative electrode material of the nickel-metal hydride battery, plays a decisive role in the performance of the battery. Therefore, improving the electrochemical performance of hydrogen storage alloys is the key to improving battery performance. Changing the composition, organization and structure of alloys a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62H01M4/04H01M4/24H01M4/26
CPCY02E60/124Y02E60/10
Inventor 马立群赵相玉丁毅
Owner NANJING TECH UNIV
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