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Preparation method of high-temperature NI-MH power battery

A power battery, nickel metal hydride technology, applied in the manufacture of alkaline batteries, alkaline batteries, alkaline battery electrodes, etc., can solve the problems affecting cycle life and efficiency, battery performance degradation, active material loss, etc., to achieve the goal of reducing heat Produce, engage in high-rate discharge performance, reduce the effect of internal resistance

Active Publication Date: 2014-09-03
砀山县纳方包装材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods have a certain effect on improving the performance of high-temperature batteries, there are still many deficiencies. Although the coating has improved the above phenomena to a certain extent, the coating is still not firm enough, and the surface layer dissolves and falls off after charging and discharging. , leading to the loss of active materials and reduced electrical conductivity, seriously affecting cycle life and efficiency
[0005] Another method is to add cobaltous oxide and cobalt hydroxide, but during the charging and discharging process after the addition, it dissolves in the alkaline aqueous solution and precipitates again, and a sharp structural change occurs, and some cobalt compounds Dissociation, resulting in a change in the amount of cobalt, resulting in a decrease in battery performance,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of nickel paste: Take 4 parts of binder CMC and 45 parts of pure water, and glue at a speed of 200r / min for 4 hours; add 64.5 parts of positive active material spherical nickel hydroxide, and 3 parts of additive cobaltous oxide and 4 parts of conductive agent activated carbon, stirred at a speed of 100-300r / min for 3-5 h to obtain a nickel slurry;

[0030] (2) Coating and drying: Coat the nickel slurry prepared in step (1) on the positive electrode frame with a coating thickness of 1.0mm. After coating, dry it in an oven at 150°C for 0.5h to dry the nickel slurry. Obtain a nickel-based positive electrode coated once;

[0031] (3) Preparation of graphene slurry: take 3 parts of HPMC adhesive and 40 parts of pure water, and glue at a speed of 200r / min for 4h; add 60 parts of oligolayer graphene and 1 part of non-polar graphene dispersion, After stirring at a speed of 100r / min for 60min, put it into a ball mill tank and use a ball mill for ball mill disper...

Embodiment 2

[0037] Prepared in the same manner as in Example 1, except that the thickness of the secondary coating layer on the positive electrode was increased to 0.012mm. After testing, the discharge capacity is 94.1% of the normal temperature capacity when charged at 45°C 1C for 70 minutes, and 86.4% of the normal temperature capacity when charged at 70°C 1C for 70 minutes, and the capacity retention rate after 350 cycles is 81.2%.

Embodiment 3

[0039] Prepared by the same method as in Example 2, wherein in step (1), 5.5 parts of the binder CMC are added, 55 parts of the positive electrode active material spherical nickel hydroxide are added, and 3 parts of the conductive agent activated carbon; after testing, the normal temperature 1C capacity increases 17mAh. There is basically no change in charge and discharge efficiency at 40°C and 70°C.

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Abstract

The invention relates to a preparation method of a high-temperature nickel-hydrogen power battery, in particular to a manufacturing process of a nickel-hydrogen power battery with excellent high-temperature performance, and belongs to the technical field of secondary battery preparation. In the manufacturing process of this kind of battery, the characteristics of graphene are used, and the surface of the nickel electrode is coated with black alkene slurry for the second time, and the negative electrode skeleton is pretreated to fully form a three-dimensional conductive network. This increases the conductivity of the electrode, improves the charging and receiving capacity of the electrode under high temperature conditions, improves the electrochemical activity of the active material and the oxygen evolution potential of the positive electrode, and improves the low-temperature charging efficiency and high-current charging of the nickel-hydrogen battery as a power battery. To solve the problem of heat generation, a nickel-metal hydride power battery with good high-temperature charging performance, high-rate discharge performance and long cycle life is prepared.

Description

technical field [0001] The invention relates to a preparation method of a high-temperature nickel-hydrogen power battery, in particular to a manufacturing process of a nickel-hydrogen power battery with excellent high-temperature performance, and belongs to the technical field of secondary battery preparation. Background technique [0002] Nickel-metal hydride batteries have a history of more than ten years since their industrialization in the 1990s and have been the leading products in the secondary battery market due to their excellent charge and discharge performance, no pollution, high capacity and high energy density. . Not only is it widely used in various consumer electronic products, but it is also used as the first choice for electric vehicle power supplies. [0003] An endless stream of electronic and electrical products often require batteries to work at higher ambient temperatures (≥45°C). During the charging and discharging process of rechargeable batteries, c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/28H01M4/26H01M4/28
CPCY02E60/124Y02E60/10Y02P70/50
Inventor 李家梅
Owner 砀山县纳方包装材料有限公司