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A kind of preparation method of nickel-hydrogen battery negative electrode slurry adding carbon nanotube

A technology for negative electrode slurry and nickel-hydrogen battery, which is applied to battery electrodes, alkaline battery electrodes, circuits, etc., can solve the problems of insignificant improvement of nickel-hydrogen battery performance, inability to meet performance improvement, and destruction of hydrogen storage alloy lattice, etc. Achieve the effect of improving high-current charge-discharge performance, facilitating mass production, and avoiding agglomeration

Active Publication Date: 2018-11-13
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, these composite methods will cause serious agglomeration of carbon nanotubes in the composite system, and cannot fully exert their excellent performance, resulting in insignificant improvement in the performance of nickel-metal hydride batteries; on the other hand, it is easy to cause hydrogen storage alloy lattice damage, resulting in a decrease in its electrochemical capacity, which cannot meet the needs of performance improvement after adding carbon nanotubes to nickel-metal hydride batteries in industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) 13.4g HPMC aqueous solution (concentration is 5%), 2g acetylene black and 38.0g LaNi containing 6wt% cobalt 5 Type hydrogen storage alloy powder is placed in a dry and clean 50mL beaker, and stirred in vacuum until completely uniform to form a premix;

[0023] 2) Add 19g of carbon nanotube aqueous dispersion (concentration: 0.2%) to the premix, put it in a vacuum mixer and stir clockwise for 10 minutes, then counterclockwise for 10 minutes until the dispersion is uniform, the rotation speed is 300rpm, and the vacuum degree is 1psi;

[0024] 3) Add 0.38g of PTFE emulsion (concentration: 50%), and mechanically stir evenly to obtain negative electrode slurry.

[0025] The negative electrode slurry prepared above is applied to making carbon nanotube composite nickel-hydrogen battery, and its discharge specific capacity is measured to be 288.6mAh / g, which is the same as that prepared by the slurry without adding carbon nanotube (comparative example 1) Compared with the t...

Embodiment 2

[0027] 1) 6.7g HPMC aqueous solution (concentration is 3.5%), 1.3g nickel powder and 18.9g LaNi containing 3wt% cobalt 5 Type hydrogen storage alloy powder is placed in a dry and clean 50mL beaker, and stirred in vacuum until completely uniform to form a premix;

[0028] 2) Add 3.8g of carbon nanotube aqueous dispersion (concentration: 5%) to the premix, put it in a vacuum stirrer and stir clockwise for 10 minutes, and counterclockwise for 10 minutes until the dispersion is even. The degree is 3psi;

[0029] 3) Add 0.4g of PTFE emulsion (concentration: 50%), and mechanically stir evenly to obtain negative electrode slurry.

[0030] The negative electrode slurry prepared above is applied to making carbon nanotube composite nickel-hydrogen battery, and its discharge specific capacity is measured to be 309.8mAh / g, which is the same as that prepared by the slurry without adding carbon nanotube (comparative example 1) Compared with the test results, the discharge specific capacit...

Embodiment 3

[0032] 1) 6.65g HPMC aqueous solution (concentration is 10%), 1g cobaltous oxide and 19.0g cobalt-free LaNi 5 Type hydrogen storage alloy powder is placed in a dry and clean 25mL beaker, and stirred in vacuum until completely uniform to form a premix;

[0033] 2) Add 1.52g of carbon nanotube aqueous dispersion (concentration: 2%) to the premix, put it in a vacuum stirrer and stir clockwise for 10 minutes, and counterclockwise for 10 minutes until the dispersion is even. The degree is 5psi;

[0034] 3) Add 0.3 g of PTFE emulsion (concentration: 60%), and mechanically stir evenly to obtain negative electrode slurry.

[0035] The negative electrode slurry prepared above is applied to making carbon nanotube composite nickel-hydrogen batteries, and its discharge specific capacity is measured to be 299.8mAh / g, which is the same as that prepared by the slurry without adding carbon nanotubes (comparative example 1) Compared with the test results, the specific discharge capacity is i...

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Abstract

The invention belongs to the field of battery material preparation, and discloses a preparation method for negative electrode slurry of a nickel-metal hydride battery additionally provided with carbon nanotubes. The preparation method mainly comprises the following steps of 1) uniformly mixing and stirring a binder water solution, an additive and hydrogen-storage alloy powder to form a pre-mixed material; 2) adding a certain amount of carbon nanotube aqueous dispersion liquid to the pre-mixed material, and stirring uniformly; and 3) adding a certain amount of polytetrafluoroethylene emulsion, and stirring uniformly to obtain the negative electrode slurry. According to the preparation method, the carbon nanotubes are introduced to the negative electrode slurry in the aqueous dispersion liquid manner, so that the carbon nanotube agglomeration can be effectively avoided, damage to the crystal lattices of the hydrogen-storage alloy powder can be prevented, and the characteristics of low energy consumption, high efficiency, and easy batch production are realized; and a test result proves that the specific capacity and the high-current charging-discharging performance of the nickel-metal hydride battery can be effectively improved by adoption of the slurry preparation method.

Description

technical field [0001] The invention belongs to the field of battery material preparation. Specifically, the invention relates to a method for preparing a negative electrode slurry of a nickel-hydrogen battery, in particular to a method for preparing a negative electrode slurry for a nickel-hydrogen battery with carbon nanotubes added. Background technique [0002] Carbon nanotubes have been widely used in nickel-hydrogen secondary batteries in recent years because of their excellent mechanical properties, electrical conductivity, oxidation resistance and high theoretical electrochemical hydrogen storage properties, and the preparation of carbon nanotube composite nickel-hydrogen battery negative electrodes slurry. At present, the common composite method is: 1) directly mixing the dry carbon nanotubes with the hydrogen storage alloy in the negative electrode of the nickel-hydrogen battery; 2) performing ball milling and blending of the dry carbon nanotubes and the hydrogen s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/26H01M4/62
CPCH01M4/26H01M4/625Y02E60/10
Inventor 冯青平李世民黄贵文杜谦
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI