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A kind of negative electrode slurry of nickel-metal hydride battery and preparation method thereof

A technology for negative electrode slurry and nickel-metal hydride battery, which is applied to battery electrodes, nickel storage batteries, alkaline storage batteries, etc., can solve the problems of long stirring ultrasonic time, poor stability of the slurry, and complicated use process, so as to eliminate the danger of fire. , good temperature consistency, time-saving effect

Active Publication Date: 2020-11-06
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese invention patent ZL 201010126744.X discloses a slurry mixing method, which uses an ultrasonic dispersing device to perform ultrasonic dispersion and then mixes the materials. The ultrasonic device and the stirring device operate at the same time, and the slurry circulates between the ultrasonic device and the stirring device. Until the slurry meets the requirements, although this method can make the slurry more uniform to a certain extent, it is difficult to operate in practice. The method is complicated to use, the slurry is stirred for a long time by ultrasonic, and the effect is not obvious, and the slurry is stable. Poor sex

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  • A kind of negative electrode slurry of nickel-metal hydride battery and preparation method thereof
  • A kind of negative electrode slurry of nickel-metal hydride battery and preparation method thereof
  • A kind of negative electrode slurry of nickel-metal hydride battery and preparation method thereof

Examples

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Effect test

Embodiment 1

[0043]Example 1 A negative electrode slurry for a nickel-hydrogen battery and its preparation method

[0044] This embodiment is a method for preparing the negative electrode slurry of a nickel-metal hydride battery, which is carried out in sequence according to the following steps:

[0045] (11) Dissolve 0.1kg of CMC powder in 30kg of deionized water to form a CMC aqueous solution, stir the CMC aqueous solution in a mixing tank at 100rpm for 3 hours, and vacuum for 5 minutes to obtain A1. The viscosity of A1 is 158cp;

[0046] (12) Slowly add 0.2kg of yttrium oxide (the particle size of yttrium oxide is 30-50nm) and 0.4kg of carbon black (the particle size of carbon black is 10-50nm) to A1 in four batches, and stir at 300rpm 2h, get B1;

[0047] (13) Pulverize 67.8 kg of hydrogen storage alloy to form hydrogen storage alloy powder (pass through a 200-mesh sieve), add hydrogen storage alloy powder to B1, and stir at 400 rpm for 1 hour to obtain C1;

[0048] (14) Add 5kg of t...

Embodiment 2-5

[0050] Example 2-5 Ni-MH battery negative electrode slurry and preparation method thereof

[0051] Examples 2-5 are respectively a nickel-hydrogen battery negative electrode slurry and its preparation method. The preparation steps are similar to those of Example 1, except that the corresponding technical parameters in the preparation process are different. See the table below for details.

[0052]

[0053] The nickel metal hydride battery negative electrode slurry prepared in this example 2-5 is coated on the negative electrode plate, which is easy to be evenly coated, easy to hang slurry, dried at 150°C for 5 minutes, and the plate made after rolling has good uniformity , no fracture and no deformation, after the coated pole plate is made into a nickel metal hydride battery, charge 100% with 1C, and discharge to 0.8V at 30C for electrochemical testing. The battery capacity of Examples 2-5 is 4.9-5.3Ah, large Current discharge for 20s, voltage ≥ 0.9V; high temperature 55 de...

Embodiment 6

[0054] Example 6 Comparative Study on Performance of Ni-MH Battery Negative Electrode Slurry

[0055] In the process of preparing the negative electrode slurry of nickel-metal hydride batteries, the traditional process is to add all the negative electrode slurry raw materials into the mixing tank and stir for more than 10 hours. The mixing time is long, which affects the production capacity of the entire production line, and carbon black is not easy to mix and float On the surface of the pole plate; although in order to increase the viscosity of the slurry, the water content is reduced to achieve the purpose of increasing the viscosity of the slurry to achieve the dispersion of carbon black, but the dispersion effect is poor, and the water content is too low, the fluidity of the slurry will be very low Difference.

[0056] In this example, the performance of the negative electrode slurry prepared by dry mixing in the traditional process is compared with the negative electrode ...

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Abstract

The invention discloses nickel-metal hydride battery negative electrode slurry and a preparation method thereof. The nickel-metal hydride battery negative electrode slurry comprises the following components in parts by weight: 60-70 parts of hydrogen storage alloy powder, 0.3-0.5 part of carbon black, 0.1-0.15 part of sodium carboxymethyl cellulose, 1 part of a polytetrafluoroethylene aqueous solution, 0.2 part of yttrium oxide, 5 parts of a thickener PAS and 25-35 parts of deionized water. According to the invention, preparation of a CMC aqueous solution is used as an intermediate step, the CMC aqueous solution is controlled within a certain viscosity range, metal, non-metal materials and non-hydrophilic materials with large specific gravity differences are uniformly mixed together in a short time, the preparation period is short, the operation is simple and convenient, the dispersity and uniformity of the slurry are improved, the prepared slurry is good in stability, the high-temperature resistance is improved, and a battery prepared from the slurry has good electrochemical performance. The method is suitable for preparing the nickel-metal hydride battery negative electrode slurry.

Description

technical field [0001] The invention belongs to the field of nickel-hydrogen batteries, and relates to a nickel-hydrogen battery negative electrode slurry and a preparation method thereof. Background technique [0002] The production of nickel-metal hydride battery plates is to mix and paste raw materials such as battery active materials, conductive agents, binders, and dispersants in a certain proportion to make a slurry, which is coated on the substrate to form a plate. In this process, the dispersion and uniformity of the slurry are very important, which directly affect the subsequent production process and even the quality of the finished battery. If the dispersion and uniformity of the slurry are good, and the viscosity is within the control range, the coating effect of the electrode plate will be good, the consistency of the produced electrode plate will be good, and then the battery performance will be high in consistency and the pass rate will be high. [0003] Howe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/30
CPCH01M4/362H01M4/383H01M4/62H01M4/621H01M4/625H01M10/30Y02E60/10
Inventor 赵鑫皇甫益徐津李宝犬童志永可丹丹葛鑫
Owner INNER MONGOLIA UNIV OF SCI & TECH
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